April 12, 2019
Standard Operating Procedure
Teledyne Model 640x
Real-Time Continuous PM Monitor
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ACKNOWLEDGMENTS
This SOP was originally drafted through work order 3-13 on contract EP-G15D-00340 to
Sonoma Technology, Inc. (STI). The SOP includes substantial input taken from the Teledyne API
(T-API) Model T640 PM Mass Monitor User Manual. User experiences were included by testing
a T640 monitor temporarily located at STI's facility in Petaluma CA and EPA's testing of two
T640x instruments in RTP, NC. T-API staff provided multiple reviews of the early drafts of this
SOP. With a draft SOP in hand, EPA staff solicited input from T640 and T640x users across the
country. Input and review of the SOP was received from over a dozen monitoring agencies on a
conference call in October of 2017. Additionally, written input was received from Kathy Jones of
the Chattanooga Hamilton County Air Pollution Control Bureau and from Mickey Turner of the
Clark County Department of Air Quality. EPA colleagues from Regional offices and ORD also
provided written input. Comments and edits were received from Adam Zachary of EPA Region 4,
Dorothy Crawford of EPA Region 6, and Robert Vanderpool of EPA-ORD. Additional edits were
made as a result of feedback at the National Ambient Air Monitoring Conference in August of
2018. The input from staff at STI, T-API, early adopters of the T640 and T640x in monitoring
agencies across the country, and EPA Regional offices staff are all greatly appreciated. While this
SOP may be subject to further revisions as we learn more about how to optimize the operation of
this method, it should be far enough along to be of substantial value to agencies that need an SOP
to collect data with their T640x monitors. Additional edits, comments, or recommendations on
this SOP may be sent to Tim Hanley of the U.S. EPA's Office of Air Quality Planning and
Standards in RTP, NC (email: hanley.tim@epa.gov).
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Table of Contents
1.0 SUMMARY OF METHOD 5
1.1 PRINCIPLES 01 OPERATION 5
1.2 METHOD REQUIREMENTS 5
2.0 DEFINITIONS 6
3.0 HEALTH AND SAFETY WARNINGS 8
4.0 INTERFERENCES 8
5.0 EQUIPMENT AND SUPPLIES 8
5.1 INSTALLATION EQUIPMENT AND SUPPLIES 8
5 .2 ROUTINE EQUIPMENT AND SUPPLIES 9
6.0 PROCEDURES 9
6.1 OPERATION 9
6.2 MAINTENANCE AND SERVICE 9
6.2.1 Maintenance Schedule 9
6.3 MAINTENANCE PROCEDURES 11
6.3.1 Cleaning the PMio Inlet (Figure 1) 11
6.3.2 Cleaning the PMio well 12
6.3.3 Changing the Disposable Filter Units (DFUs) 13
6.3.4 Checking Pump Performance 15
6.3.5 Checking the Flows 16
6.3.6 Cleaning the Optical Chamber and the RH/T Sensor 16
6.3.7 Inspecting the Sample Tubes 20
6.4 INSTRUMENT VERIFICATIONS 20
6.4.1 Zero Test 21
6.4.2 Alternative Procedure for Walk-in Shelters 23
6.4.3 Pressure Verification 24
6.4.4 Ambient Temperature Verification 25
6.4.5 Total Flow (16.7 1pm) and Sample Flow (5.0 1pm) Verification 26
6.4.6 PMT Verification - (Performed Quarterly) 28
6.5 INSTRUMENT CALIBRATIONS 30
6.5.1 Pressure Calibration 30
6.5.2 Sample Flow (5.00 1pm) and Bypass Flow (11.7 1pm) Calibrations 31
6.5.3 PMT Calibration 34
6.6 TROUBLESHOOTING AND SERVICE 36
6.6.1 Fault Diagnosis 37
6.6.2 Flow Problems 38
7.0 DATA MANAGEMENT AND RECORDS MANAGEMENT PARAMETERS.38
7.1 DATA MANAGEMENT 38
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7.2 RECORDS MANAGEMENT 39
8.0 QUALITY CONTROL/QUALITY ASSURANCE 39
9.0 INSTALLATION INSTRUCTIONS 39
9.1 Indoor/Outdoor Installation 39
9.2 Aerosol Sample Conditioner (ASC) Connections and Installation 40
9.3 Temperature Probe Connection 42
9.4 Power Connection 44
9.5 Communications Interface Connections 44
9.6 Shelter Installation with Roof Penetration 44
9.7 Outdoor Enclosure Installation 45
9.8 Pneumatics 47
9.9 Instrument Start-up 49
10.0 MONTHLY QC AND MAINTENANCE SHEET 50
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1.0 SUMMARY OF METHOD
The Teledyne API Model T640x is a real-time, continuous particulate matter (PM) mass monitor
that uses scattered light spectrometry for measurement; specifically, it employs broadband
spectroscopy using 90° white-light scattering with a polychromatic light-emitting diode (LED).
There are two designated methods using the T640 instrumentation. The model T640 with 640x
option (T640x) is an approved Federal Equivalent Method (FEM) for PM2 5 [EQPM-0516-238],
PM10 [EQPM-0516-239], and PM10-2.5 [EQPM-0516-240], The T640x operates at a total flow rate
of 16.7 1pm with 5.0 1pm entering the measurement cell and the remaining 11.7 1pm discarded as
bypass flow. This SOP is written specifically for the T640x method. The model T640 is an
approved FEM for PM25 [EQPM-0516-236], The T640 also measures PM10 and PM10-2.5, but only
the PM2.5 fraction meets FEM requirements. The T640 operates with a single flow rate at 5.0 1pm.
1.1 PRINCIPLES OF OPERATION
The Model T640x PM Mass Monitor is an optical aerosol spectrometer that converts optical
measurements to mass measurements by determining sampled particle size via scattered light at
the single particle level according to Lorenz-Mie Theory. In brief, the sampling head draws a
representative sample of ambient aerosol at a flow rate of 16.7 1pm. The flow is split with 5.0 1pm
direct to the monitor and 11.7 1pm discarded as bypass flow. The aspirated particles in the 5.0
lpm flow are then dried (i.e., brought below 35% RH) with the Aerosol Sample Conditioner
(ASC) and moved into the optical particle sensor where scattered light intensity is measured to
determine particle size diameter. The particles move separately into the T-aperture through an
optically differentiated measurement volume that is homogeneously illuminated with
polychromatic light. The polychromatic light source, an LED, combined with a 90° scattered light
detection, achieves a precise and unambiguous calibration curve in the Mie range, resulting in a
large size resolution.
Each particle generates a scattered light impulse that is detected at an 85° to 95° angle where
amplitude (height) and signal length are measured; the amplitude of the scattered light impulse is
directly related to the particle size diameter. The T-aperture and simultaneous signal length
measurements eliminate border zone error, which is characterized by the partial illumination of
particles at the border of the measurement range.
1.2 METHOD REQUIREMENTS
The method requirements for the T640x were published in the Federal Register in Volume 81,
page 45285 on July 13, 2016 as part of the Federal Equivalent Method (FEM) Designation. These
requirements were published as: ' 'Teledyne Advanced Pollution Instrumentation Model T640 PM
mass monitor with 640X option,'' continuous ambient particulate monitor operated at a
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volumetric flow rate of 16.67 Lpm equipped with the louvered PMio inlet specified in 40 CFR 50
Appendix L, Figs. L-2 thru L-19, TAP I aerosol sample conditioner (P/'N: 081040000),
configured for operation with firmware version 1.0.2.126 or later, in accordance with the
Teledvne Model T640 Operations Manual.
Additional requirements of operating the method may not be explicitly included as part of the
method designation; however, they would apply for consistency with standard monitoring
practices and use of the data for comparison to the NAAQS. For example, the sample volume for
the method is reported at actual conditions (local conditions or LC) for PM2.5 and at Standard
Temperature and Pressure (STP) for PM10. Each of these (i.e., LC and STP) are calculated by
using the instruments ambient temperature and barometric sensor data. Requirements such as
these should be referenced in a monitoring organization's Quality Assurance Project Plan
(QAPP).
Other requirements not explicitly stated as part of the method designation, included in the T640
operations manual, applicable sections of CFR, or identified in an agencies QAPP do not apply.
2.0 DEFINITIONS
PM2.5 is particulate matter with an aerodynamic diameter less than or equal to a nominal 2.5 pm.
PM10 is particulate matter with an aerodynamic diameter less than or equal to a nominal 10 pm.
PM10-2.5 is coarse particulate matter with aerodynamic diameter in the nominal range of 2.5 to
10 pm.
Most technical terms in this SOP are defined as they are introduced. A few important definitions
are provided in Table 2-1. The terms monitor and instrument are used interchangeably in this
document.
Table 2-1. Terms and definitions.
Term
Definition
Accuracy
The degree of agreement between an observed value and an accepted
reference value; includes a combination of random error (precision) and
systematic error (bias) components due to sampling and analytical operations.
Actual conditions
The actual ambient temperature and pressure of a gas at the time its volume
(or volumetric flow rate) is measured.
Bias
The systematic or persistent distortion of a measurement process that causes
errors in one direction.
Calibration
The act of adjusting an instrument after comparison with a standard.
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Term
Definition
Chain-of-custody
Unbroken trail of accountability that verifies the physical security of
environmental samples and documented information.
Coefficient of variation
A standardized measure of dispersion of a probability distribution or
frequency distribution. Defined as the ratio of the standard deviation to the
mean.
Downtube
The vertically oriented tube that connects the PM2 5 sampler inlet to sampler
components inside the sampler case. To check the sample flow rate, the
sampler inlet is removed from the downtube and a flow rate standard is
connected in its place.
Flow adapter
A tight-fitting connecting device, with an isolating valve, that is inserted in
place of the PM2 5 sampler inlet on the upper end of a sampler's downtube
and used to connect a flow rate calibration or audit device to check the
sample flow rate. In some cases, the device may also be used for leak checks.
Sometimes referred to as the flow shut-off valve.
Flow calibration device
A National Institute of Standards and Technology (NIST)-traceable flow
determining apparatus (also called a flow rate standard) that is attached to the
flow adapter device and used to assist in measuring and setting the volumetric
flow rate of air into the sampler.
Impactor
An inertial particle-size separator. A PM2 5 reference method sampler uses a
specially shaped inlet followed by an impactor that allows only PM of well-
defined size ranges to penetrate to the filter collection portion of the collector.
Leak check
A test to determine if any post-air flow is passing the expected flow path of
the PM2.5 sampler.
Off Scan
When the data stream from the monitor is disabled from logging to the data
system. This is typically done during periods of maintenance, verifications, or
calibrations.
Orifice flow rate check
device
One type of flow rate calibration or check device (transfer standard), based on
an established relationship between flow rate and pressure drop across the
orifice plate. An orifice's operating characteristics are determined in the
laboratory using a flow rate standard such as a soap film flowmeter. Orifice
devices generally require temperature and pressure corrections. Modern
orifice flow rate check devices generally make the needed temperature and
pressure corrections for the user. The orifice flow rate check device most
commonly used on PM2 5 samplers may also be called a venturi.
Precision
A measure of mutual agreement among individual measurements of the same
property, usually under prescribed similar conditions, expressed generally in
terms of standard deviation.
Verification
The act of checking or verifying an instrument against a standard; involves no
adjustment of the instrument.
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3.0 HEALTH AND SAFETY WARNINGS
To avoid damage to the monitor, ensure that the AC power voltage matches the voltage indicated
on the monitor's model/specifications label located on the rear panel before plugging the T640x
into line power. High voltages are present inside the instrument. Ensure that the power cord being
used is capable of carrying the power rating of the instrument (see rear panel label). Note:
• Ensure that the power connection has a functioning ground connection.
• Do not defeat the ground wire on power plug.
• Turn off instrument power before disconnecting or connecting electrical subassemblies.
• Do not operate the instrument with its cover off.
Some repair and troubleshooting operations need to be carried out with the monitor open and
running. Use common sense when operating inside a running monitor. Exercise caution to avoid
electrical shocks and electrostatic or mechanical damage to the monitor. Do not drop tools into
the monitor or leave tools in the monitor after your procedures. Do not short or touch electric
connections with metallic tools while operating inside the monitor. For monitors installed in small
shelters, beware of external elements (i.e., weather conditions) when performing maintenance
which exposes the monitor to ambient conditions.
4.0 INTERFERENCES
There are no known interferences to the collection of PM2 5 and PM10 using this method;
however, surface roughness and other variables do affect sizing algorithms in all light scattering
instruments. Since the PM concentration output is based on a calculation using the last 10 minutes
of data, the operator should wait a minimum of 10 minutes after reassembly of the instrument
before turning the data system to "On Scan."
5.0 EQUIPMENT AND SUPPLIES
5.1 INSTALLATION EQUIPMENT AND SUPPLIES
Installation requires hand tools (flat blade screw driver and adjustable wrench) and silicone
sealant. Most shelters have the necessary roof perforation needed. If not, it may be necessary to
work with the shelter manufacturer on the appropriate method for making the perforation. Most
of the routine equipment and supplies listed below will be needed for the initial installation to
ensure the instrument is operating properly.
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5.2 ROUTINE EQUIPMENT AND SUPPLIES
The following equipment, supplies, and expendables are required for sensor checks, adjustments,
and operation:
1. HEPA filters (x2) configured with adapter to connect to downtube for zero testing
2. Auditing device (NIST-traceable pressure and temperature standard and flow standard)
used for pressure, temperature, and flow verifications and calibrations. The auditing
device is required to have certification within the last 12 months.
3. SpanDust™ used for photomultiplier tube (PMT), verification and adjustment as needed
4. O-ring grease packets or tube of vacuum grease
5. Canned air for electronic use (e.g., DustOff, BlowOff electronics dusters)
6. Lint-free washable microfiber rags or lint-free disposable wipes
7. Distilled water in a spray bottle
8. Mild detergent
9. Swagelok® Cap for %" tubing
10. Allen wrench
11. Philips screwdriver
12. Cleaning brushes
13. Cotton tipped applicators
14. Pull rope assembly (used for pulling cleaning rags or tube brush through the inlet tube)
15. Disposable Filter Units (DFUs)
16. USB flash memory drive (for firmware updates [when necessary] and manual data
downloads)
6.0 PROCEDURES
6.1 OPERATION
Upon startup, sampling begins. Allow a minimum of 20-minute warming period for reliable
readings. This should provide sufficient time for the LED temperature to stabilize (-10 minutes)
and then another 10 minutes for the smoothing algorithm to incorporate the data at a stable LED
temperature. Track LED temperature from the dashboard to ensure stability of the instrument.
6.2 MAINTENANCE AND SERVICE
6.2.1 Maintenance Schedule
As a part of routine system management, preventive maintenance includes inspections, cleaning,
verifications, and calibrations. Table 6-1 provides a list of actions and their frequencies.
Section 5.2 of the user manual describes procedures.
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Table 6-1. T640x Maintenance and QC Check Schedule.
Maintenance or Check Action
Tolerance
Frequency
Check Pump Performance
PWM1 value < 80%
PID1 value < 85%
Weekly to Monthly
Check for leaks with zero filter
Acceptance criteria is 0.0 - 0.3 ng/m3
Action level is 0.1 to 0.3 ng/m3
(for each PM metric)
Monthly
Clean Inlet
NA
Quarterly
Clean PMio Well
NA
Monthly
Check/Adjust PMT with SpanDust™
(measured peak, limit value displayed on
bottle +/- 0.5)
Stated value on SpanDust™ bottle +/- 0.5
(e.g., 11.3 with a tolerance of 10.8 to 11.8)
Quarterly.
Avoid over performing this
procedure. If problems persist, wait
10 minutes and retry.
Ambient Pressure
+/-10 mm Hg
Monthly
Ambient Temperature
+/- 2°C
Monthly
Flow rate verifications (see below)
Total flow: 16.67 1pm
+/- 5% of standard compared to current
reading on T640x. (e.g., 15.87 - 17.54 1pm
if T640x reads 16.7).
Monthly
Sample flow: 5.0 1pm
+/- 5% of standard compared to current
reading on T640x; (e.g., 4.75 - 5.25 1pm if
T640x reads 5.00).
Monthly
Bypass Flow: 11.671pm
+/- 5% of standard compared to reading on
T640x; (e.g., 11.12 - 12.29 1pm if T640x
reads 11.7).
As needed if total or sample flow
does not meet criteria. Use same
tolerance as total and sample flow.
Inspect and clean optical chamber and
relative humidity/temperature (RH/T)
sensors
NA
Every six months or as needed, e.g.,
high dust load
Change Disposable Filter Unit (DFU) for 5-
1pm sample flow and 11.67 1pm bypass
flow
NA
Annually or when Pump PWM
value approaches 80% or valve
PWM approaches 85%.
Inspect inner and outer sample tubes
NA
Monthly or as needed
1 Pulse width modulation (PWM); proportional, integral, differential (PID) loop
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6.3 MAINTENANCE PROCEDURES
This section provides cleaning and maintenance information for the inlets and filters. Always
allow at least 10 minutes of operation after a procedure to ensure reliable operation.
6.3.1 Cleaning the PMio Inlet (Figure 1)
To clean the PMio inlet (see figure 1), ensure data are "Off Scan."
1. Power off the pumps from the Setup >Vars >Pump Control menu. Pump choices are auto,
off, and cleaning cycle. Press 'edit' and then 'off to turn off the pumps.
2. Remove the sampling inlet from the downtube.
3. Place the flow audit adapter or HEPA filter on the downtube to minimize opportunity of
dust entering the monitor.
4. Disassemble the sampling inlet (four screws on the underside of inlet base plate).
5. Carefully and thoroughly remove any dust deposits from inside the inlet.
6. Remove any insects or other debris from the filtering screen.
7. Clean all the components using water and a mild detergent, if necessary.
8. Dry all components thoroughly with a clean cloth and blow canned air through the
nozzles.
9. Check and, if needed, replace the O-rings located on the outside and the inside of the base
plate, and grease them with vacuum grease.
10. Reassemble the sampling inlet, sliding the baseplate back into the base of the inlet body,
making sure to line up with the screw holes. The screws should be reinstalled using hand-
tight pressure.
11. Reconnect the sampling line.
12. Power up the pumps from the Setup >Vars >Pump Control menu. Press 'edit' and then
'auto' to turn the pumps back on. Allow a minimum of 10 minutes for the system to
return to reliable operation. Ensure the data acquisition system is reengaged.
This procedure should be repeated per the schedule listed in Table 6-1.
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Figure 1. PMio Inlet
6.3.2 Cleaning the PMio: well
For this procedure, ensure data are "Off Scan."
1. Power off the pumps from the Setup >Vars >Pump Control menu. Pump choices are auto,
off, and cleaning cycle. Press 'edit" and then 'off to turn off the pumps.
2. Remove the sampling inlet from the downtube.
3. Unscrew the top of sampling inlet from the base of the inlet to expose the PMio well.
4. Using a moist lint free towel or wipe, clean the inside base of the PMio well.
5. Using DI water, saturate the tip of a cotton tipped applicator (or similar) and clean out
each of the three nozzles in the PMio well.
6. Carefully inspect and remove any insects or spider webs. If there is a spider web present,
make note of it on the "Monthly QC and Maintenance Checklist" sheet. Also, take
photos with a smart phone or similar.
7. If needed, dry all components thoroughly with a clean cloth.
8. Blow canned air through the three nozzles.
9. Inspect and clean, as necessary the bottom connection of the downtube with a lint free
towel or wipe.
10. Inspect and clean the water collector if any debris or water are present.
11. Check and, if needed, replace the O-rings located on the outside and the inside of the base
plate, and grease them with vacuum grease.
12. Carefully reassemble the top and base of the sampling inlet, but do not overtighten.
13. Reconnect to sampling line.
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14. Power up the pumps from the Setup >Vars >Pump Control menu. Press 'edit" and then
'auto" to turn the pumps back on. Allow 10 minutes for the system to return to reliable
operation. Ensure the data acquisition system is reengaged.
This procedure should be repeated per the schedule listed in Table 6-1.
6.3.3 Changing the Disposable Filter Units (DFUs)
There are two DFUs on the T640x, one internal filter for the 5.0 1pm pump and one external for
the 11.67 1pm pump. If changing one filter, it is recommended that the other filter also be
changed. For this procedure, ensure data are "Off Scan."
Internal Pump Filter:
1. Power off the internal pump from the control menu: Setup >Vars >Pump >Edit >Off
>Done.
2. Remove the screws at the sides of front panel, if installed.
3. Pull open the instrument's front panel, using the front panel finger grips (Figure 3).
4. Write "New" and today's date on the filter with a sharpie
(recommended).
Figure 2. Disposable Filter Unit (DFU)
Figure 3. Opening the Front Panel
5. Noting its orientation, remove the old DFU by detaching from the pneumatic quick-
connect fittings, and replace with a new DFU matching the orientation (Figure 4).
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Figure 4. Internal DFU
6. Power on the internal pump from the control menu: Setup >Vars >Pump >Edit >Auto
>Done.
7. Review the internal pump flow rate reading in Dashboard or Home Screen to ensure the
5.0 1pm flow is reading as expected: >Main Menu >Home >Dashboard.
External Pump Filter:
8. Unplug or turn off the electrical switch, if available, to the external pump (operates at
11.67 1pm).
9. Write "New" and today's date on the filter with a sharpie (recommended).
10. Noting its orientation at the back of instrument, detach the filter from the quick-connect
fittings and replace it with new filter (Figure 5).
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Orientation
I
II
flDI
Direction
of DFU: Cap . .
i - a . ¦ for Flow
toward inlet ¦ ¦ J L
Disposable
Filter Unit
(DFU)
i
Instrument
Figure 5. External DFU
I
11. Ensure the filter is seated snugly with no gaps.
12. Plug the bypass pump's electrical cord back in or otherwise turn on pump.
13. Review the internal pump flow rate in Dashboard or Home Screen to ensure the
11.67 1pm flow is reading as expected: >Main Menu >Home >Dashboard.
14. Allow a minimum or 10 minutes for the system to return to reliable operation. Ensure the
data acquisition system is reengaged.
6.3.4 Checking Pump Performance
There are two pumps associated with the T640x. One pump is internal (operating at 5 1pm). The
second pump is external (operating at 11.67 1pm). The 5 1pm pump must maintain proper flow for
measurement accuracy; while the combined flow of the internal and external pump (i.e.,
16.67 1pm) ensure that the PM o inlet is operating at its designed flow rate for a PMjs cut-point.
Check the PWM performance levels in the Dashboard (If these parameters are not found in the
Dashboard, configure the Dashboard to add them; see Section 3.2.9 of the T640 User Manual).
Pump PWM should be running between 35% and 80%.
Valve PWM should be running between 35% and 85%.
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It is strongly recommended to pay attention to the total and sample flow rates as well as the Pump
and Valve PWM readings. These are recorded monthly on the Monthly QC and Maintenance
Sheet (see section 10 of this SOP). If any issues are found with flow verifications or calibrations,
refer back to the Pump and/or Valve PWM readings when the instrument was known to be
performing within acceptable flow and PWM tolerances. If a new DFU filter is placed in the
instrument and the applicable Pump or Valve PWM does not return to near where it was reading
when the filters were previously new then troubleshoot by inspecting all sample lines looking for
SpanDust or anything else that may be affecting the flow. See Table 6-2 for additional
troubleshooting guidance.
6.3.5 Checking the Flows
Check the Sample Flow levels in the Dashboard. (If it's not found in the Dashboard, add it
through the Dashboard configuration page; see Section 3.2.9 of the T640 User Manual). If out of
range (outside of 16.67 1pm +/- 0.83 1pm for total flow rate and 5.00 1pm, +/- 0.25 1pm for sample
flow rate), refer to Table 6-2 for troubleshooting guidance.
For the T640x, also check the Bypass Flow levels in the Dashboard. (If it's not found in the
Dashboard, add it through the Dashboard configuration page; see Section 3.2.9 of the T640x User
Manual). If it's out of range (11.67 1pm, +/- 0.58 1pm), refer to Table 6-2 for troubleshooting
guidance.
6.3.6 Cleaning the Optical Chamber and the RH/T Sensor
Cleaning the optical chamber and sample lines connecting to the chamber should be performed at
least every 6 months and more frequently if issues are suspected; however, it can be a somewhat
tedious procedure, especially for installations in small shelters located outside. Before starting,
carefully consider and plan for an appropriate amount of time to perform this procedure,
including disassembly and reassembly, as well as all associated verifications and calibrations. For
outdoor shelters, additionally consider if any precipitation or extreme weather is forecasted. As
much as four hours may be needed to fully complete the procedure for outside installations and
two hours for indoor ones when using a slip coupler. Also, we highly recommend taking a few
photos with a smart phone or similar device prior to disconnecting any of the sample lines inside
the monitor.
For this procedure, ensure data are "Off Scan."
1. Power down the monitor and unplug.
2. Power down the bypass pump.
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5.
6.
7.
3. Disconnect the ASC power line from the back of the instrument.
4. Disconnect the bypass flow line from the top of ASC using a 9/16"' wrench
(Figure 6).
Adjust the slip coupler and move the monitor to the side so that there is
enough room for the ASC to be removed (see procedure 6.4.2).
Remove and clean both the extension tube and the upper inlet tube that sit
directly above the ASC (Figure 24).
Remove the ASC by carefully lifting it up from monitor chassis.
8. Remove and clean the Aluminum Adapter (Figure 22) that fits over the black
inlet nozzle. Check the O-ring that sits on the adapter for cracks or breaks;
clean and/or replace as necessary.
9. Remove and clean the Black Inlet Nozzle (Figure 21)
sample tube that fits on top of the optical cell.
10. Unscrew the monitor lid (it may have 4 screws, 2 on each
side) and lift the lid off of the monitor chassis.
11. It is recommended to take photos of the sample line connections with a smart phone or
similar device. Then disconnect sample lines from leading to the components on the ASC
support.
12. Remove the ASC support, which straddles the sensors. Four screws secure that support to
the floor of the instrument, two on each footing (Figure 7). Note: it's possible to clean the
optics without removing the ASC support; however, removing the ASC support will
allow more room to access the tubing lines and optical chamber.
Figure 6. Bypass
connection to top of ASC
two screws per footing
Optical Sensor
ASC su
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Figure 7. Maintenance: Optical Chamber and RH/T Sensor Access
13. Locate the optical cell, the cup at the bottom of optics chamber and its tubing, and the
Relative Humidity and Temperature (RH/T) sensor (Figure 8).
RH/T sensor RH/T sensor tubing
optical
tubing between cup
at optics chamber
bottom and RH/T sensor
Figure 8. Maintenance: Location of Optics Chamber and RH/T Sensor
14. Remove the optical cell from the optics chamber, and remove the cup, including its
tubing, from the optics chamber bottom; detach the RH/T sensor tubing from the DFU
filter (Figure 9). It is very important that all components are disassembled before blowing
air into the chamber.
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Remove collection
cup from bottom of
chamber.
optics
Detach RH/T sensor
tubing from DFU filter.
Remove hex screws.
Pull T-cell from optics chamber. Fit is very
tight, but DO NOT USE TOOL TO PRY OUT.
Figure 9. Maintenance: Optical Chamber Disassembly
15. Clean the optics chamber's interior surfaces, ensuring to include windows, with a lmt-
free cloth (Figure 10).
Interior
Optics Chamber
windows
Figure 10. Maintenance: Optics Chamber Windows
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16. Use canned air made specifically for dusting electronics to blow any dust or other debris
from the optics chamber, from the cup, from the bottom of the optics chamber, and from
the tubing (Figure 11).
Figure 11. Maintenance: Final Dusting
17. When cleaning has been completed, reassemble the optics chamber components; reinsert
the cup to the bottom of optics chamber; reconnect the tubing from the cup in bottom of
the chamber to the RH7T sensor and from the RH/T sensor to the DFU filter, reinstall the
ASC support, re-connect all power and flow lines, and move the monitor back in line so
that the slip coupler can be reconnected.
18. Close the instrument and power back both the bypass pump and monitor.
19. Review dashboard to ensure all flows are operating as expected.
20. Perform a Zero Test (Section 6.4.1 of this SOP).
21. Perform a PMT sensor check with the SpanDust™ (Section 6.4.5 of this SOP).
6.3.7 Inspecting the Sample Tubes
Look inside the sample tubes for debris or dust on the walls. If needed, push a rag or a paper
towel through the tubes; then use canned air made specifically for electronics to blow through the
line for final cleaning. However, do not completely block a sample tube still under vacuum, as the
sample flows should never be blocked while the unit is still operating
6.4 INSTRUMENT VERIFICATIONS
There are five basic verification checks listed below. All verifications should be conducted first
before any calibrations, and then calibrations can be conducted (see section 6.5) where necessary.
Verifications are conducted before calibrations as this is necessary to document the "as found"
conditions of the instrument. Three of the verifications can be calibrated, if necessary. There is no
adjustment for either the zero test or ambient temperature and as such failure of one or both of
these checks results in the need to troubleshoot rather than adjust a setting. Also, for flow rate, the
procedure calls to verify die total flow rate (16.67 1pm) and then the sample flow rate (5.0 1pm);
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however, the total flow rate cannot by itself be calibrated. Instead, if the total flow does not meet
its required tolerance, the sample flow and bypass flow are calibrated, if necessary. The Zero
Test, Pressure sensor, Ambient Temperature sensor, and Flow sensor verifications are all
performed monthly. The PMT verification using SpanDust™ is performed quarterly. The five
checks should always be performed in the specific order as shown below:
1. Zero Test;
2. Pressure sensor verification;
3. Temperature sensor verification;
4. Flow sensor verifications;
5. PMT verification using SpanDust™.
Once all verifications are completed, calibrations may be conducted (see section 6.5), where
necessary, for pressure, flow, and the PMT. For the Pressure Cal and the two Flow Cal menus,
note that the "Measured" parameter provides the value measured by the T640x, and the "Actual"
parameter is the value that is to be input from the reading measured by the external auditing
device.
6.4.1 Zero Test
The internal components of the T640x are not meant to be under strict vacuum as what would
normally be done in a leak test. So, to avoid damage to internal components, it is recommended
that the inlet never be capped (air tight) while the instrument pumps are running.
The Zero Test is a way to check for leaks that do not involve pulling a vacuum on the system.
Note: no adjustment is made if the zero test is not acceptable, rather troubleshoot the instrument
until resolved. For this procedure, ensure data are "Off Scan."
There are two options to perform a zero test. In the first (and recommended) zero test instructions
the calibration software is initiated to bypass the boxcar 10-minute smoothing of data. This
allows an almost immediate response of the PM channels to their expected reporting of 0.0 (.ig/nr1
for each PM metric. In the second set of instructions a manual zero test can be run without
initiating the calibration software. However, this approach to a zero test requires waiting at least
10-minutes so that each channel of data can be smoothed according to the corresponding setting
from the boxcar (i.e., 10 minutes). Only one type of zero test is to be performed. Each set of
procedures are explained below:
Zero Test with near immediate response:
1. Remove the inlet and fit a HEPA filter to the sample port. Ensure the tubing is not
kinked.
2. From the main screen on the T640 panel display, select:
"Calibration";
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"Leak Check"; and
• "Start".
3. Observe the front panel display on the monitor until the PM values (PMio and PM2.5
channels) are presented and steady; record to "Monthly QC and Maintenance Sheet".
4. If each PM value reaches 0.0, accept the zero test and move to step 7. If data are in the
range of 0.1 to 0.3, accept the data and troubleshoot. If after ten or more minutes the data
are still at 0.4 or greater, identify the data as suspect on the "Monthly QC and
Maintenance Sheet" and troubleshoot. If the PM values are not reading zero, then it's
likely to be one of two issues:
There may be a leak in the system above the optical sensor (i.e., from the optical
sensor nozzle up to where the HEPA filter was fitted). Troubleshoot by checking
each connection between monitor and HEPA filter and ensuring there is a good
seal or:
It is possible the HEPA filter being used is either bad or leaking. It is
recommended to have a second filter handy to check.
5. If after following these steps each PM channel does not reach (0.0), repeat steps above
including resealing the HEPA filter to the sampler port and cleaning the downtube with a
lint free cloth and use of a dowel.
6. Record any updated results to the "Monthly QC and Maintenance Sheet."
7. Once each PM channel reaches zero (0.0) for each PM metric, press "Stop" and then the
home button. ^^3
8. Disconnect the HEPA filter.
9. Disassemble the zero apparatus.
Manual Zero Test:
1. Remove the inlet and fit a HEPA filter to the sample port. Ensure the tubing is not
kinked.
2. Observe the PM values on the front panel display. Press either "Home" or the H-l-H key.
3. After approximately 10 minutes, the PM values should be at zero (0.0) for each PM
metric. If data reaches 0.0, accept the zero test and move to step 5. If data are in the range
of 0.1 to 0.3, accept the data and troubleshoot. If after ten or more minutes the data are
still at 0.4 or greater, identify the data as suspect on the Monthly QC and Maintenance
Sheet and troubleshoot. If the PM values are not reading zero, then it's likely to be one of
two issues:
There may be a leak in the system above the optical sensor (i.e., from the optical
sensor nozzle up to where the HEPA filter was fitted). Troubleshoot by checking
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each connection between monitor and HEPA filter and ensuring there is a good
seal or:
It is possible the HEPA filter being used is either bad or leaking. It is
recommended to have a second filter handy to check.
4. If after ten minutes from any adjustment, values don't reach zero (0.0), troubleshoot and
repeat steps above.
5. Once PM values reach zero (0.0) for each PM metric, disconnect the HEPA filter.
6. Record to "Monthly QC and Maintenance Sheet."
6.4.2 Alternative Procedure for Walk-in Shelters.
For walk-in shelter installations, a single operator will be challenged to review data on the front
panel of the monitor while performing QC verifications and calibrations on a roof. Two operators
could be used; however, in most cases this is not practical. To allow verifications and calibrations
for walk-in shelter applications, Teledyne has a slip coupler which can be utilized to allow audit
devices and SpanDust ™ to be used from inside the shelter. The procedure for use of the slip
coupler does not apply to zero tests as the HEPA filter should be installed on the downtube where
the PMio inlet is normally connected to the downtube on the roof. Also, the procedure for
verifying ambient temperature needs to be conducted on the roof so that the routine ambient
temperature probe can be checked. For all other verifications and calibrations, where necessary,
the following applies to using a slip coupler. For this procedure, ensure data are "Off Scan."
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Figure 12. Slip coupler in normal position and lifted vertically.
1. Holding the downtube above the slip coupler with one hand, lift the slip coupler with
your other hand from its current position to a height just high enough so that the slip
coupler is no longer touching the aluminum downtube below (Figure 12). The downtube
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above the slip coupler should be held in a consistent vertical position so that the seal
between the downtube and roof flange is maintained.
2. Carefully move the T640x monitor chassis and ASC away from the downtube so that
there is enough clearance for the audit device to be attached. This requires moving the
base of the monitor (Figure 13).
Figure 13. Slip coupler moved to the side to allow monitor use with audit devices.
3. Detach the ambient temperature probe on the back of the monitor and temporarily attach
the short cable temperature probe so that the temperature inside the shelter is being used
for calculations of flow.
4. Perform remaining verifications and where applicable, calibrations. A verification of the
short temperature probe is also recommended.
5. With all verifications and calibrations complete, detach short cable temperature probe and
re-attach the ambient temperature probe from the roof.
6. Align the T640x monitor chassis so that the ASC is directly below the slip coupler.
7. Holding the downtube above the slip coupler with one hand, reengage the slip coupler
back to its original position with your other hand. The downtube above the slip coupler
should be held in a consistent vertical position so that the seal between the downtube and
roof flange is maintained.
8. Visually inspect downtube to ensure it is plumb. Use a level if available.
6.4.3 Pressure Verification
The pressure measurement of the T640x is for the ambient pressure in which the instrument is
operated. No direct pneumatic connection to the instrument needs to be made to perform this
check and data are not affected. To change pressure units to mm Hg, go to Setup >Vars >Pressure
Units >mmHg.
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1. With the Pressure Standard operating and measuring the ambient pressure in the same
room as the T640x monitor, navigate to the Pressure Cal menu: >Calibration >Pressure
Cal. Alternatively, pressure can be obtained through the dashboard on the main screen.
2. Compare the "Measured Pressure" in this screen to the Audit Pressure Standard
(Figure 14).
3. If the two values differ by more than +/- 10 mm Hg, note on "Monthly QC and
Maintenance Sheet" and continue with the remaining verifications
Pressure Cal 11:29:24 AM
Sample Flow Cal
To adjust the Actual Pressure setting, dick the value.
Press the Calibrate button to proceed.
Figure 14. Pressure calibration screen.
6.4.4 Ambient Temperature Verification
The ambient temperature probe can be verified; however, there is no available way to calibrate
this sensor. Temperature probes that do not meet the expected tolerance of +-2°C from a
temperature standard should be inspected and cleaned. Cleaning of the gill screen may also help
to ensure air can pass freely to the probe. A spare temperature probe should be available in case
the verification continues to fail the acceptable tolerance. The following procedure applies to a
temperature verification:
Temperature verifications can be conducted either with the instrument in normal operation or
with the unit operating, but "Off Scan"'
1. Obtain the ambient temperature reading from the front panel of the T640x monitor.
Alternatively, ambient temperature can be obtained through the dashboard on the main
screen.
2. Hold the temperature probe of the audit device in close proximity to the gill screen which
houses the ambient temperature probe of the T640x. If there is direct sunlight, ensure the
audit probe is held behind the gill screen relative to the sun so that the gill screen casts a
shadow on the audit device temperature probe.
3. Wait at least one minute for the audit device temperature to stabilize.
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4. Record the audit device ambient temperature and T640x ambient temperature to the
"Monthly QC and Maintenance sheet".
5. Compare the audit temperature to the T640x's displayed ambient temperature. If the
difference between the two temperatures exceeds +/-2°C, troubleshoot and repeat.
6. If the verification cannot meet the required +/- 2°C tolerance, replace the temperature
probe and repeat the verification test.
6.4.5 Total Flow (16.7 1pm) and Sample Flow (5.0 1pm) Verification.
Flow rate verifications for total flow rate (16.7 1pm) and sample flow rate (5.0 1pm) can be
conducted with the instrument operating normally so long as the data are "Off Scan." Although
this section is for verifications, the information available in the flow rate calibration screen may
also be useful for verifications. The flow calibration screens can be accessed at: >Calibration
>Sample Flow Cal and >Calibration >Bypass Flow Cal. Flow rate calibration procedures are
detailed in section 6.5.2.
The flow rate verifications and calibrations should be conducted in the following order:
1. Verify total flow rate: 16.67 1pm. Whether acceptable or not move to the next step.
2. Verify sample flow rate: 5.00 1pm. If both total and sample flow meet acceptable
tolerances, you are done with the flows.
3. If the sample flow rate is not acceptable, calibrate the sample flow rate and repeat
verification of total flow.
4. If the total flow rate is not acceptable and sample flow is acceptable, calibrate the bypass
flow rate.
5. Repeat verification of the total flow rate.
Total Flow Verification (16.67 1pm). For the verification procedure, ensure data are "Off Scan."
1. Set up your NIST-traceable flow standard transfer device with the appropriate inlet for
the flow to be calibrated.
2. Remove the inlet from the Upper Inlet Tube.
3. Connect the Flow Standard to the top of the Upper Inlet Tube. Ensure the tubing
connecting the inlet to the Flow Standard is not kinked.
4. With the T640x running, go to main menu or Dashboard to review Total Flow
(16.67 1pm).
5. Wait at least one minute for the flow to re-stabilize.
6. Record the audit device flow rate and the T640x total flow rate on the "Monthly QC and
Maintenance Sheet."
7. Compare the T640x Total Flow Rate to the audit device flow rate and determine if these
values differ by more than 5%, (e.g., outside of 15.87 - 17.54 1pm for total flow, if
sampler reads 16.7). Make any notes on the "Monthly QC and Maintenance Sheet."
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8. Move to verifying the sample flow rate (5.0 1pm).
Sample Flow Verification (5.0 1pm). For this procedure, ensure data are "Off Scan:1
L Disconnect the auxiliary flow rate line from side of ASC. Ensure the auxiliary flow line is
not blocked and only pulling in ambient air.
2. Cap the Swagelok fitting at the side of ASC.
3. Set up your NIST-traceable flow standard transfer device with the appropriate inlet for
the flow to be calibrated. Ensure the audit device is appropriately sized for 5.0 1pm flow.
4. Remove the inlet from the Upper Inlet Tube.
5. Connect the Flow Standard to the top of the Upper Inlet Tube. Ensure the tubing
connecting the inlet to the Flow Standard is not kinked.
6. With the T640x running, go to the Calibration >Sample Flow Cal menu. Alternatively,
you can view sample flow from the dashboard.
7. Wait at least one minute for the flow to re-stabilize.
8. Compare the "Measured Flow" in this screen to the Flow Standard (Figure 15) and
determine if these values differ by more than 5%, (e.g., outside of 4.75 - 5.25 1pm for
sample flow, if the sampler reads 5.00)
9. Record the measured flow rate difference on the "Monthly QC and Maintenance Sheet."
If the sample flow rate meets the required tolerance, then you are done with the sample
flow verification. If the sample flow rate is outside of the acceptable tolerance, perform a
sample flow calibration as detailed in section 6.5.2.
10. Record the results on the "Monthly QC and Maintenance Sheet:'
11. Disconnect the Swagelok cap from the ASC. Reattach bypass line, unless a bypass flow
calibration is to performed; descibed below.
Flow 5 Calibration -3 % 3:24:34 PM
Sample Flow Cal
To adjust Actual Fbw setting, c&ck the value.
Press the Calibrate button to proceed.
Pressure Cal
PMT Adjust
Measured Flow:
Actual Flow:
4.S0 LPM
Status: Never Run
> Home > Calibration
Mode: SAMPLE
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Figure 15. Sample Flow calibration screen.
Bypass flow verification and calibration (11.67 1pm), if necessary. A calibration of the bypass
flow is only needed if the total flow verification does not meet the acceptable tolerance and the
sample flow has already been verified as acceptable and/or calibrated. For this procedure, ensure
data are "Off Scan."
1. Connect the NIST-traceable flow transfer standard device to the Bypass line that was
disconnected in the sample flow verification procedure above. Ensure the fitting(s)
connecting flow transfer standard and the bypass line are secure and not leaking.
2. With the T640x running, go to the flow calibration menu: >Calibration >Bypass Flow
Cal.
3. Wait a least one minute for flow to stabilize.
4. Compare the "Measured Flow" in this screen to the Flow Transfer Standard and
determine if these values differ by more than 5% (e.g., outside of 11.12 - 12.29 1pm for
bypass flow, if sampler reads 11.7 1pm). However, values approaching the 5% tolerance
should also be considered for a calibration since the bypass flow check is expected to be
performed infrequently.
5. Record the measured bypass flow rate on the "Monthly QC and Maintenance Sheet." If
the bypass flow rate meets the required tolerance, proceed to step 8. If the sample flow
rate is outside of the acceptable tolerance or is close to not meeting the tolerance, then
proceed with step 6 to perform a calibration of the bypass flow rate.
6. To calibrate the bypass flow rate, press the value button in the "Actual Flow" field, enter
the value measured by the Flow Standard, and press the "Calibrate" button on this screen.
The Bypass Measured Flow value should change to closely match the Actual Flow within
a few seconds.
7. Record the results on the "Monthly QC and Maintenance Sheet."
8. Reattach the bypass line to the ASC.
6.4.6 PMT Verification - (Performed Quarterly)
The Particle Sensor PMT verification uses SpanDust™, a monodisperse dust with a specific
refractive index. All T640x instrument PMTs have a very specific response to this span dust
which allows for the sensor to be checked and adjusted in the field for drift caused by
contamination of the optics. This is not a calibration of the optical sensor based on the mass
concentration of dust being used, but simply a mechanism to check and adjust the PMT response
to particles with a specific and known refractive index.
Note: Although the PMT verification is a very useful check that tells the user if the performance
of the monitor spectrometer is as expected, multiple checks of the PMT or individual verifications
that lead to too must span dust entering the monitors optics can itself lead to poor performance of
the monitor's spectrometer, flow system, and/or RH sensor. Careful attention needs to be made to
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ensure a minimum amount of span dust enters the sample tube during a verification and that
repeats of verifications are kept to a minimum.
For a step by step demonstration of the PMT Adjustment, use the QR code below to view a video
by Teledyne API. Also available at: https://www.voutube.com/watch?v=pZYnXwYwtls
For this procedure, ensure data are "Off Scan."
1. Navigate to the PMT Adjust screen: >Home >Calibration
>PMT Adjust.
2. Press the Start button on this screen to suspend normal data
acquisition and to start this adjustment process.
3. Remove the T640x sample inlet.
4. Prepare the SpanDust™ bottle by uncapping the "air intake"
tubing on the cap of the bottle.
5. Place the tube from the SpanDust™ bottle into the top of the
Upper Inlet Tube for the instrument.
6. Ensure that the silicone tube fits snugly inside the aluminum inlet tube, and do not allow
the bottle to hang, as it could dislodge the silicone tube from the inlet tube.
7. Gently tap the SpanDust™ bottle to barely agitate the contents just enough to allow the
dust to be pulled into the sensor, and allow 30 seconds for the Peak Channel reading in
this screen to respond (Figure 16).
8. Record the maximum Peak Channel. PMT Setting and Peak Channel Counts to the
"Monthly QC and Maintenance Sheet."
9. If the Peak Channel reading meets the acceptable ± 0.5 of SpanDust™ value stated on
bottle, then proceed to step 11.
10. If the Peak Channel is not acceptable, then retry one more time by pressing the "Stop"
button, then the "Start" button on the T640x, then proceed to step 7 above. If after two
tries the Peak Channel is still not acceptable, then move to the instrument calibration
procedures described in section 6.5
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Sample Flow Cal
Peak
Adjust
Bypass Flow Cal
Pressure Cal
—'minn ni urrrrrmnn] n n fTTl
-30 -25 -20 -15 -10 -5 0 5 10 15 20 25 30
Figure 16. PMT adjust screen
11. Reattach the sample inlet and press the Stop button to stop the adjustment process and
resume normal data acquisition.
12. Wait 10 minutes, review data on the home screen of the T640x, and then bring unit back
"On Scan" in the data system.
6.5 INSTRUMENT CALIBRATIONS
There are three checks of the monitor that can be calibrated. These calibrations are performed
after all verifications (see section 6.4) are conducted. Calibrations only need to be performed for
the checks not meeting their expected performance criteria. The checks that can be calibrated are
conducted in the following order, as necessary:
1. Pressure sensor calibration;
2. Flow sensor calibration and re-verification; and
3. PMT calibration using SpanDust™.
-I
6.5.1 Pressure Calibration
The pressure measurement of the T640x is for the ambient pressure in which the instrument is
operated. No direct pneumatic connection to the instrument needs to be made to perform this
calibration and data are not affected.
For this procedure, ensure data are "Off Scan."
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1. With the Pressure Standard operating and measuring the ambient pressure in the same
room as the T640x monitor, navigate to the Pressure Cal menu: >Calibration >Pressure
Cal.
2. Compare the "Measured Pressure" in this screen to the Audit Pressure Standard
(Figure 17).
3. If the two values differ by more than +/- 10 mm Hg, then press the value button in the
"Actual Pressure" field, enter the value measured by the Pressure Standard and press
"enter." Then press the "Calibrate" button on the screen.
4. Record the test results on the "Monthly QC and Maintenance Sheet."
The Measured Pressure value should change to closely match the Actual Pressure within a few
seconds.
Pressure Cal X 11:29:24 AM
Sample Flow Cal
To adjust the Actual Pressure setting, dick the value.
Press the Calibrate button to proceed.
Figure 17. Pressure calibration screen. IMPORTANT: Perform this calibration
prior to any flow calibration.
6.5.2 Sample Flow (5.00 1pm) and Bypass Flow (11.7 1pm) Calibrations
Flow rate calibrations are conducted on the sample flow (5 1pm) and the bypass flow (11.67 1pm)
by going to the sample flow rate calibration menu at: >Calibration >Sample Flow Cal. Note: a
calibration of total flow rate (16.7 1pm) is not available, rather the sample and bypass flow rates
are individually calibrated. Once a flow is calibrated, it should be re-verified to make sure it is
within a tolerance of +1-2%. Total flow verification of a monitor is acceptable if the measured
flow rate is within +/- 4% of an audit device.
Flow calibrations should be conducted after all verifications and a pressure calibration have been
performed, as necessary. Conduct the flow rate calibrations and re-verification of the flows in the
following order:
1. Calibrate the sample flow rate (5 1pm);
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2. Conduct the sample flow rate (5 1pm) verification to ensure reading of the monitor is
within 2% of audit device. Note: a 2% tolerance is to ensure that the flow sensor of the
instrument is reading reasonably close to the expected value immediately following a
flow calibration;
3. Calibrate the bypass flow (11.67 1pm) calibration;
4. Conduct the bypass flow verification to ensure the reading of monitor is within 2% of
audit device;
5. Perform verification of the total flow rate (16.67 1pm), see section 6.4.5.
Calibration of Sample Flow (5.0 1pm). For this procedure, ensure data are "Off Scan."
1. Disconnect the auxiliary flow line from the side of the ASC. Ensure the auxiliary flow
line is not blocked and only pulling in ambient air.
2. Cap the Swagelok fitting at side of the ASC.
3. Set up your NIST-traceable flow standard transfer device with the appropriate inlet for
the flow to be calibrated. Ensure the audit device is appropriately sized for 5.0 1pm flow.
4. Remove the inlet from the Upper Inlet Tube.
5. Connect the Flow Standard to the top of the Upper Inlet Tube. Ensure the tubing
connecting the inlet to the Flow Standard is not kinked.
6. With the T640x running, go to the Calibration >Sample Flow Cal menu.
7. Wait at least one minute for the flow to re-stabilize.
8. Compare the "Measured Flow" in this screen to the Flow Standard (Figure 18) and
determine if these values differ by more than 5%, (e.g., outside of 4.75 - 5.25 1pm for
sample flow, if sampler reads 5.00).
9. Record the test results on the "Monthly QC and Maintenance Sheet." If the sample flow
meets the required tolerance, proceed to step 13 as you are done with the sample flow. If
the sample flow rate is outside of the acceptable tolerance, continue with step 10 to
perform a calibration of the sample flow rate.
10. If the Sample flow is off by more than 5%, press the "Start" button (this disables the
internal data logging), and then "Actual Flow."
11. Enter the value measured by the Flow Standard and hit "Enter," then press the
"Calibrate" button on this screen. The Measured Flow rate value should change to closely
match the Actual Flow rate within a few seconds.
12. Record the results on the "Monthly QC and Maintenance Sheet."
13. Continue reading the flow rate standard and ensure standard is within 2% of the measured
flow (4.90 -5.10 1pm). Record the test results on the "Monthly QC and Maintenance
Sheet."
14. Disconnect the Swagelok cap from the ASC. Reattach the bypass line, unless a bypass
flow calibration is to performed; described below.
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15. Press "Stop" on the sample flow calibration menu to end the sample flow calibration
procedure and return to normal operation.
Flow 5 Calibration -~] ¦£ 3:24:34 PM
Sample Flow Cal
To adjust the Actus! Row setting, cSck the value.
Press the Calibrate button to proceed.
Figure 18. Sample Flow calibration screen.
Bypass flow calibration (11.67 1pm), if necessary. A calibration of the bypass flow is only
needed if the total flow verification does not meet the acceptable tolerance and the sample flow
has already been verified and/or calibrated. For this procedure, ensure data are "Off Scan."
1. Connect the NIST-traceable flow transfer standard device to the Bypass line that was
disconnected in the sample flow verification procedure above. Ensure the fltting(s)
connecting flow transfer standard and bypass line are secure and not leaking.
2. With the T640x running, go to the flow calibration menu: >Calibration >Bypass Flow
Cal.
3. Wait a least one minute for flow to stabilize.
4. Compare the "Measured Flow" in this screen to the Flow Transfer Standard (Figure 19)
and determine if these values differ by more than 5% (e.g., outside of 11.12 - 12.29 1pm
for bypass flow, if sampler reads 11.7 1pm). However, values approaching the 5%
tolerance should also be considered for a calibration since the bypass flow check is
expected to be performed infrequently.
5. Record to "Monthly QC and Maintenance Sheet." If the bypass flow meets expected
tolerance, then proceed to step 9. If the sample flow rate is outside of the acceptable
tolerance or is close to not meeting the tolerance, proceed with step 6 to perform a
calibration of the bypass flow rate.
6. If the bypass flow rate is off by more than 5%, press the "Start" button (this disables the
internal data logging), and then "Actual Flow."
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7. Enter the bypass flow rate value measured by the Flow Standard and hit "Enter," then
press the "Calibrate" button on this screen. The Measured Flow value should change to
closely match the Actual Flow within a few seconds.
8. Record the test results on the "Monthly QC and Maintenance Sheet."
9. Continue reading the flow standard and ensure the standard is within 2% of the measured
flow (11.47 - 11.93 1pm). Record the test results on the "Monthly QC and Maintenance
Sheet."
10. Reattach the bypass line to the ASC.
Flow 11 Calibration "0" \ 7:08:01 PM
Sample Flow Cal
To adjust the Actual Flow setting, dick the value.
Press the Calibrate button to proceed.
Pressure Cat
PMT Adjust
Measured Flow:
Actual Flow:
11.64 LPM
Status: Never Run
A
<
~
~
> Home > Calibration
Mode: SAMPLE
Figure 19. Bypass Flow calibration screen.
6.5.3 PMT Calibration
Once all verifications and any necessary calibrations to the pressure and flow systems are
complete, an adjustment of the Particle Sensor PMT may be performed using SpanDust™. A
calibration of the PMT is an adjustment in the field for drift caused by contamination of the
optics. Note: Careful attention needs to be made to ensure a minimum amount of SpanDust™
enters the sample tube during an adjustment of the PMT and that repeats of this calibration are
kept to a minimum
For a step by step demonstration of the PMT Adjustment, use the QR code below to view a video
by Teledyne API. Also available at: https://www.voutube,com/watch?v=pZYnXwYwtls
34
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For this procedure, ensure data are "Off Scan."
1. Navigate to the PMT Adjust screen: >Home >Calibration
>PMT Adjust.
2. Press the Start button on this screen to suspend normal data
acquisition and start this adjustment process.
3. Remove the T640x sample inlet.
4. Prepare the SpanDust™ bottle by uncapping the "air intake"
tubing on the cap of the bottle.
5. Place the tube from the SpanDust™ bottle into the top of the
Upper Inlet Tube for the instrument.
6. Ensure that the silicone tube fits snugly inside the aluminum inlet tube, and do not allow
the bottle to hang, as it could dislodge the silicone tube from the inlet tube.
7. Gently tap the SpanDust™ bottle to barely agitate the contents just enough to allow the
dust to be pulled into the sensor, and allow 30 seconds for the Peak Channel reading in
this screen to respond.
8. Record the maximum Peak Channel. PMT Setting and Peak Channel Counts to the
"Monthly QC and Maintenance Sheet."
9. If the Peak Channel reading is acceptable ± 0.5 of SpanDust™ value stated on bottle,
then proceed to step 13.
10. If the Peak Channel is not acceptable, then retry one more time by pressing the "Stop"
button, then the "Start" button on the T640x and proceed with step 7 above.
11. If after two tries the Peak Channel reading is not within ± 0.5 of SpanDust™ value stated
on bottle, then adjust the PMT Setting by pressing the Peak Adjust left (decrement) or
right (increment) buttons to center the Peak voltage (Figure 20). Each press of a button is
1 volt, so press the Peak Adjust button by as many times as the number of volts the
reading is off.
PMT
Adjustment
Video
35
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April 12, 2019
Sample Flow Cal
Peak
Adjust
Bypass Flow Cal
Pressure Cal
—'minn ni urrrrrmnn] n n fTTl
-30 -25 -20 -15 -10 -5 0 5 10 15 20 25 30
Figure 20. PMT adjust screen
12. Allow 30 seconds for the Peak Channel reading in this screen to respond, and if it is not ±
0.5 of Span Dust •' value stated on bottle, repeat the process. This could take several tries
over a long period when conducted in a humid environment.
13. Once the Peak Channel reading is + 0.5 of SpanDust™ value stated on bottle, record the
test results on the "Monthly QC and Maintenance Sheet/'
14. Reattach the sample inlet and press the Stop button to stop the adjustment process and
resume normal data acquisition.
15. Wait 10 minutes, review data on home screen of T640x, and then bring unit back "On
Scan'' in the data system.
6.6 TROUBLESHOOTING AND SERVICE
This section provides guidance for resolving fault conditions and possible flow and calibration
problems?
1. To review Alerts, select >Alerts.
2. Document any alerts, including date and time to the ""Monthly QC and Maintenance
3. To clear alerts, select the following: >Alerts >Select >Clear Selected. Then select the
home button.
4. If alerts reappear, then there is something wrong and this need to be diagnosed. See
Sheet.
below:
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April 12, 2019
6.6.1 Fault Diagnosis
The Alerts log may be useful in diagnosing faults. Table 6-2 lists some of the Alerts that are
triggered by faults, describes their likely causes, and provides possible solutions.
Table 6-2. Alerts and Recommendations
Message
Description
Possible Solution(s)
System Reset
Warning raised when the system is reset
Normal power cycle occurred? If
not, check external power source.
Sample Flow
High
The Sample Flow is greater than 5.25 1pm
Check pneumatic fittings.
Re-calibrate flow.
Sample Flow Low
The Sample Flow is less than 4.75 1pm
Check pneumatics. Check for
blockages. Re-calibrate flow.
Bypass Flow High
The Bypass Flow is greater than 12.25 1pm
Check pneumatic fittings.
Re-calibrate flow.
Bypass Flow Low
The Bypass Flow is less than 11.08 1pm
Check pneumatics.
Check for blockages. Re-calibrate
flow.
Sample RH High
The Sample RH is above the set point
Check if ASC is plugged in.
Check control board if ASC control
LED is illuminated.
Check if water is in the sensor
Check LED
If the LED temperature is equal to the box
temperature, the LED may be OFF
Cycle power.
Call Teledyne-API Tech Support.
Check PMT
The PMT HV setting is out of range (800 -
2200)
Check Sensor with SpanDust™.
Perform an optical chamber
cleaning.
Call Teledyne-API Tech Support.
Sample Flow
Slope OOR
The Sample Flow Calibration Slope is Out
Of Range (OOR)
Check pneumatics for leaks.
Re-run flow calibration.
Call Teledyne-API Tech Support.
BYPS Flow Slope
OOR
The Bypass Flow Calibration Slope is Out
Of Range
Check pneumatics for leaks.
Re-run flow calibration.
Call Teledvne-API Tech Support.
Check Int Pump
Check the internal pump if the PWM is
>80
Check pneumatics for blockages.
Check pneumatics for leaks.
Check flow calibration.
Replace pump.
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April 12, 2019
Message
Description
Possible Solution(s)
Check Ext Pump
Check the external pump and/or bypass
flow control valve if valve PID >85
Check pneumatics for blockages.
Check pneumatics for leaks.
Check external pump.
Check flow calibration.
External pump, or bypass flow
control valve may need replacing.
Sample Temp
Warning
Sample Temperature Warning (>60)
Check ASC (is it latched ON?)
Ensure proper climate and
ventilation for instrument.
Box Temp
Warning
Box Temperature Warning (>60)
Ensure proper climate and
ventilation for instrument.
AMB Press Slope
OOR
Ambient Pressure Calibration Slope is out
of range
Check calibration (make sure units
match calibration device).
Replace pressure sensor.
Call Teledyne-API Tech Support.
6.6.2 Flow Problems
If a flow auditing device indicates any problems with flow rates, check to ensure the following:
all connections are seated tightly and evenly (no gaps);
the inlet is not clogged or blocked;
the pumps are running and are within their PWM range (35% - 80%);
internal tubing appears free from SpanDust™ or any other restricting debris;
the DFUs appear reasonably clean and changed within last 12 months;
ensure flow audit device is operating properly (e.g., is the unit appropriately charged).
After making any adjustments, run a flow rate calibration and recheck the flow rate. If problems
persist, contact Teledyne-API Technical Support for assistance.
7.0 DATA MANAGEMENT AND RECORDS MANAGEMENT
PARAMETERS
7.1 DATA MANAGEMENT
Data collected by the T640x at the monitoring site will be stored on a data acquisition system
(DAS). Data can be remotely polled for upload into a centralized database. Ensure data backups
are conducted a regular basis.
The in-situ DAS will be a commercially available computer based unit capable of retrieving
digital records from the station instruments via an Ethernet connection. It will store 1 minute
averages from the instruments. The instrument will store approximately 1 year of data internally
and data can be retrieved at any time to fill in any missing data in the database due to transfer
issues.
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April 12, 2019
Table 7-1 lists the parameter, method, and unit codes for the T640x and T640 data.
Table 7-1. Parameter, method, and unit codes.
Parameter
Description
Parameter
Code
Method Code
for T640
at 5.0 lpm
Method Code
for T640x
at 16.67 lpm
Units
Unit
Code
pm25
88101
236
238
Micrograms/cubic meter (LC)
105
PMio-LC
85101
236
239
Micrograms/cubic meter (LC)
105
PMh,-2 5 LC
86101
236
240
Micrograms/cubic meter (LC)
105
PMio STP
81102
not available
239
Micrograms/cubic meter
(760 mm Hg, 25 °C)
001
7.2 RECORDS MANAGEMENT
Field site visits will be stored in site log books documenting access to the monitoring sites and the
key activities performed. Details on routine QC and maintenance are recorded to the "Monthly
QC and Maintenance Sheet."
8.0 QUALITY CONTROL/QUALITY ASSURANCE
The instrument will be operated in accordance with the manufacturer's recommendation. The
maintenance recommendations presented above, including the recommended verifications and
adjustments, will be followed. Alerts (diagnostic codes) issued by the instrument will be reviewed
and appropriate corrections will be initiated when indicated. The alerts will be retained as part of
the instrument data. Daily review of instrument output is made to ensure operability. Data
reasonableness will also be assessed to ensure instrument output is consistent with expectations
for the instrument location, time of day, typical concentrations, and season.
9.0 INSTALLATION INSTRUCTIONS
9.1 Indoor/Outdoor Installation
This section presents the various connections for setup and preparing the instrument for
operation. The T640x can be installed in an indoor or outdoor shelter with roof penetration or in
an outdoor enclosure. Section 9.2 provides step-by-step instructions for ASC connections and
installation. If the instrument is being installed in a shelter with roof penetration, see Section 9.6
for installation instructions. If the instrument is being installed in an outdoor enclosure
installation, see Section 9.7 for installation instructions.
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April 12, 2019
Ensure that the rack installation provides proper ventilation clearance (minimum of 1" from the
sides and top of instrument and 4" from the back of instrument) and inlet height (2 ni above
ground level).
9.2 Aerosol Sample Conditioner (ASC) Connections and Installation
The ASC requires an inlet nozzle and an adapter for installation. The black inlet nozzle to the
optical sensor is specific to the instrument (not interchangeable to other T640x instalments).
Please note, the final assembly differs slightly between the T640x ASC and the T640 option
ASC.
1. Insert the black inlet nozzle through the center of the support collar into the top of the
optical sensor, seating it tightly so that the nozzle's upper O-ring flange is flush with the
upper surface of the sensor body (Figure 21).
Figure 21. ASC Setup: Inlet Nozzle
2. Slide the aluminum adapter over the black inlet nozzle, ensuring its base is flush with the
top of the optical sensor (Figure 22).
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April 12, 2019
Figure 22. ASC Setup: Aluminum Adapter
3. Attach the water collector to the inlet (Figure 23).
Figure 23. Water Collector Attached to Inlet
4. Assemble the inlet and the ASC as depicted in Figure 24, ensuring the parts fit snugly
with no gaps. Note that if the instrument is to be installed in a shelter with roof
penetration, leave the inlet with the water collector off for the time being.
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April 12, 2019
Upper Inlet Tube
(inlet line to
(ASC, 5 LPM)
iner~4^~ I
Bypass Line Fitting
for Bypass Pump
(split flow connection
to pump, 11.67 LPM J
ASC Bypass/
Downtube Coupler
— ASC Sample Tube
Figure 24. 640x Inlet and ASC Assembly
5. Lower the ASC into the support collar, ensuring it fits straight with no gaps.
6. Plug the ASC wiring into the rear panel connector.
9.3 Temperature Probe Connection
1. Plug the ambient temperature probe connector into its respective rear panel electrical port
(Figure 25).
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April 12, 2019
Figure 25. Ambient Temperature Probe and ASC Connections
2. Route the probe outside and insert it into solar shield, ensuring the solar shield maintains
a vertical orientation (Figure 26).
Figure 26. Ambient Temperature Probe Installed in Solar Shield
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April 12, 2019
9.4 Power Connection
Adhering to the warning messages, insert the power cord between the instrument's AC power
connector and a properly rated power outlet.
9.5 Communications Interface Connections
For network or Internet communication with the instrument, connect an Ethernet cable from the
analyzer's rear panel Ethernet interface connector to an Ethernet port. The address settings default
to automatic configuration by Dynamic Host Configuration Protocol (DHCP). Most users will
want to configure the instrument with a static IP address; however, you should consult your
network administrator to discuss other potential options. For data downloads and firmware
updates, use a flash drive inserted into the front panel USB port. See Section 3.2.6 of the User
Manual.
9.6 Shelter Installation with Roof Penetration
For rooftop installation instructions recommended by Teledyne API see the video from the QR
code below. Alternatively, you can view this video at:
https://www.voutube.com/watch?v=8H5NmNgBglM
1. Determine the location where the T640x will operate in the
shelter.
a. The instrument should be installed in a location where
the top of the ASC will be no less than two feet from the
top of the ceiling/roof line or,
b. The instrument should be placed at a height within the
shelter so that after the ASC and 8' extension sample
line are installed, the inlet (on top of the 8' extension
sample line) is 2-m above the roof and equal height with
any other PM instrument inlets.
c. Align all pieces before making any cuts in the roof.
d. Ensure the monitor downtube is capped so that no debris
enters the downtube during drilling and installation.
2. Drill a hole in the roof to accommodate the diameter of the 8' extension sample line
(5/8" OD).
3. Install the provided roof flange over the hole.
a. Make sure to use good quality roof sealant for the base of the roof flange to
ensure weather tightness and to prevent any leaks into the shelter
4. Without locking it down, setup the sample line tripod so that its sample line hole aligns
with the hole in the roof.
a. The tripod should be setup at such a height to properly support the sample line
with the inlet on top.
T640x
Rooftop
Installation
Video
• • •
44
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April 12, 2019
5. Without the inlet installed on the top of the ASC, line up the instrument so that the
opening at the top of the ASC is in-line with the sample line hole/roof flange on the
shelter roof.
6. Install the slip coupler on top of the ASC
7. Slide the 8' sample line extension down through the tripod and the roof penetration until
it meets the opening of the slip coupler.
a. The sample line should be plumb to prevent any strain on the instrument and to
prevent pneumatic leaks.
b. The sample line should slide into the top of the slip coupler and bottom out when
in completely. Ensure that the sample line is not pushing down on the connection
inside the slip coupler such that the monitor can be moved to the side, as needed,
for verifications and audits.
8. Lightly tighten the tripod cord grip and the roof flange cord grip around the sample line
to hold it in place.
9. Test the slip coupler and ensure the monitor can be moved. Move the monitor back to its
original location and re-connect slip coupler.
10. At the top of the sample line (on the roof), place the provided inlet collar so that its top is
3" from the top of the sample line. This is for proper clearance from the base of the inlet
and to prevent any instrument flooding if the inlet were to ever get water inside of it.
11. Lock down the collar once it is determined to be at the proper location 3" from the top of
the sample line.
12. Place the inlet on top of the sample line.
a. Make sure the inlet is secure (i.e., that the collar holding it is not sliding).
b. Proper installation should have the inlet 2-m above the roof.
13. Plug the ASC connector into the proper fitting on the rear panel of the T640x.
14. Connect the power cable and ambient temperature sensor at the back of instrument.
15. Before sealing the cord grips, power up the instrument and make sure it is running
properly.
16. Once the T640x instrument is determined to be installed and working properly, tighten up
the roof flange cord grip around the sample line.
17. Apply clear silicone caulk generously around the top end of where the cord grip rubber
grommet meets the sample line to ensure complete sealing from the weather.
a. Silicone caulk seals well and can easily be removed and reapplied if the
instrument needs to be removed for servicing.
18. Tighten the tripod cord grip and lock down the feet of the tripod to fully secure the
sample line.
19. Inspect the PMio well to ensure it's clean
9.7 Outdoor Enclosure Installation
1. Install the enclosure in the location where the instrument is to run.
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April 12, 2019
2. Measure the distances and clearances for the location of the T640x monitor and inlet. The
T640x instrument should be installed in the enclosure at a height where the inlet will be
at least 2-m above ground (from ground level to the inlet height). Adjust the shelf as
needed; however, do not actually locate the monitor on the shelf yet.
3. Slide the ASC up through the port of the doghouse by several inches above where the
monitor will sit and tighten the collar over the ASC such that it is held in place, but do
not over-tighten. The ASC must be installed from the inside of the enclosure due to the
power connector on the ASC.
4. Locate the 640x monitor chassis on the shelf of the enclosure.
a. Make sure the black inlet nozzle (Figure 21) and aluminum adapter (Figure 22)
are installed on the optical sensor.
5. Once the T640x is in the enclosure and lined up with the opening on the top of the
enclosure, carefully untighten the collar holding the ASC and slide it down gently until it
inserts into opening of the T640x.
a. The ASC should go into the T640x level and plumb and is in completely when it
is felt to bottom out onto the top of the optical sensor. This can be checked by
lowering the front panel of the T640x and making sure the base of the ASC is
touching the top of the optical sensor flush.
6. Plug the ASC connector into the proper fitting on the rear panel of the T640x.
7. Connect the power cable and ambient temperature sensor at the back of instrument.
8. Before sealing the collar, power up the instrument and make sure it is running properly
9. Once the T640x instrument is determined to be installed and working properly, tighten up
the collar around the ASC.
10. Inspect the PMio well to ensure it's clean
11. Apply clear silicone caulk generously around the top end of where the collar rubber
grommet meets the ASC to ensure complete sealing from the weather.
a. Silicone caulk seals well and can easily be removed and reapplied if the
instrument needs to be removed for servicing.
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April 12, 2019
9.8 Pneumatics
L
Figure 27. T640 Pneumatics
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April 12, 2019
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Pump
11 W-lpm
1S.67 - Ipm
5-lpm
Pulsation
Dampener
«
Flow
Meter
<—
DFU
i
RH/T
Sensor
Exhaust
11.67 • Ipm
11.67-Ipm
Flow
Meter
Flow
control
valve
f
Figure 28. T640 with 640x Option Pneumatics
48
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April 12, 2019
9.9 Instrument Start-up
With all hardware and electrical in place, power-up the T640x. The monitor will take a few
minutes to work through its start-up routine. Ensure the data system is not logging data at this
point, except as necessary to ensure data transfer is appropriately bringing in information from
the T640x. The following activities should be performed after the unit is brought on line: Note:
references to the user manual are provided, where applicable.
1. Check the firmware; upgrade firmware to latest version, if necessary. (See section 3.2.6
of T640x User Manual).
2. Adjust the clock on the T640x to local standard time (LST). (See section 3.2.12.2 of
T640x User Manual).
3. Select parameters to display on front panel home screen. (See section 3.2.11 of T640
User Manual).
a. To select parameters, press the configuration button:
b. Users can select whichever parameters are most important to them. Our
provisional recommendation is to include:
i. Sample Flow (5.0 lpm)
ii. Ambient Temp
iii. Sample RH:
4. Select parameters to include in "dashboard." See "Monthly QC and Maintenance Sheet"
in section 10.0 below for recommended parameters to include. (See Section 3.2.9 of the
T640x User Manual to configure dashboard).
5. It is recommended to use units of mm Hg for pressure. To change pressure units to mm
Hg, go to Setup >Vars >Pressure Units >mmHg.
6. Select LED temperature and track its stability in a trend chart. Once stable move to next
step.
7. Conduct Instrument Verifications and Calibrations (section 6.4 of this SOP)
8. Inspect the Disposable Filter Units (DFUs) to ensure they appear new. Label as "new"
with today's date using a sharpie.
9. Close-up instrument front panel and inspect all connections.
10. Wait ten minutes, which allows concentration data to be updated to ambient conditions.
11. Review the concentration data on front panel display and ensure all parameters appear
reasonable compared to current conditions. Compare T640x data to other available data
at current site or nearby site, if available.
12. Enable data recording to "On Scan."
13. Document the instrument's startup in Field log book.
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April 12, 2019
10.0 MONTHLY QC AND MAINTENANCE SHEET
Order of Monthly Checks:
Station:
1. Document any alarms and then clear.
2. Record parameters as found from Dashboard.
3. Take instrument "Off Scan" from data system
4. Perform zero test; clean PMio well.
5. Perform verifications of:
a. BP
b. Ta
c. Total flow (16.67 1pm)
d. Sample flow(5.0 1pm)
e. Span Dust (performed quarterly)
6. Perform, only if needed calibrations of pressure, flow, and PMT.
7. Put instrument back together.
8. Clear any remaining alarms
9. Wait minimum of 10 minutes to ensure PM concentrations are
representative of ambient air.
10. Record "After" parameters from Dashboard in far-right column.
11. Bring instrument back on line to data system.
Operator:
Analyzer S/N:
Date:
Time monitor out of
service (LST):
Time monitor back in
service (LST):
Any alarms enabled?
List alarm/date/time if
applicable
Parameters from Dashboard:
I s found / After
Amb P. (mm Hg)
PMT Setting
Current PMT hv
Amb T. (°C)
BoxT. (°C)
LED Temp. (°C)
l'\ b - Cone. ('Lig m:l i
ASC Heater Duty
Pump PWM (° b)
PMio Cone, (gg/m3)
Sample Temp. (°C)
Sample Flow (1pm)
PMio STP (ng/m3)
Sample RH (° o)
Valve PWM (° b)
Package Version
Total Flow (1pm)
Monthly QC Checks:
Audit Device:
S/N:
Last Cert. Date:
QC Check
Verifications:
Calibrations:
Tolerance
Audit Actual
T640x
Audit Actual
T640x
Zero Test
NA
Re-zero if any issues found and corrected:
0.0 on each PM metric
BP
+/- 10 mm Hg
Ta
+/- 2°C
Total Flow
16.7 1pm
+/-5°b of T640x (e.g., 15.87 -
17.541pm)
Sample Flow
5.00 1pm
+/-5°b of T640x (e.g., 4.75 -
5.25 1pm)
Bypass Flow 11.7 1pm
(only as needed)
+/-5°b ofT640x (e.g., 11.12 —
12.29 1pm)
Additional Checks and Maintenance (longer than monthly):
Date Completed
Quarterly
Span Dust™
(+/- 0.5 value
on Span
Dust™ bottle)
Peak Ch. =
PMT Setting =
Peak Ch. Counts =
Inlet
1. Clean PMio Inlet (above PMio well)
Every 6 Months
1. Clean Optical Chamber
2. Clean RH Sensor
3. Clean Ta Sensor
Every 12 months
or if valve or pump PWM value
approaches 80°b
1. New internal (5.0 1pm) Disposable Filter LTnit (DFLT) [inside front panel]
2. New external (11.67 1pm) Disposable Filter LTnit (DFU) [at back of
instrument!; It is recommended to change both DFLTs on the same day.
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April 12, 2019
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