Teledyne T640 Manual

STATEWIDE
STANDARD OPERATING
PROCEDURE
FOR
TELEDYNE T640 PM2.5 PARTICULATE MONITOR
STATE OF FLORIDA
DEPARTMENT OF ENVIRONMENTAL PROTECTION
OFFICE OF AIR MONITORING
Prepared by: Florida PQAO Date: 11/6/2017
Approved by: _____________________________ Date: _______________________
Quality Assurance Manager
Approved by: _____________________________ Date: _______________________
EPA Region IV Approval Officer
Document History

Revision No.
Date
Responsible Person
Description of Change
0
November 2017
Florida PQAO
Initial Release

Table of Contents
1.0 PURPOSE............................................................................................................... 1
2.0 SCOPE AND APPLICABILITY............................................................................ 1
3.0 SUMMARY OF THE COLLECTION METHOD................................................. 1
3.1 Principles of Operation .................................................................................................2
4.0 DEFINITIONS AND CONVERSION FACTORS................................................ 2
5.0 HEALTH AND SAFETY PRECAUTIONS .......................................................... 4
6.0 INTERFERENCES................................................................................................. 4
7.0 PERSONNEL QUALIFICATIONS....................................................................... 4
8.0 EQUIPMENT AND SUPPLIES............................................................................. 5
8.1 INSTALLATION EQUIPMENT AND SUPPLIES.....................................................5
8.1.1 ROUTINE EQUIPMENT AND SUPPLIES.......................................................... 5
9.0 INSTALLATION, STARTUP AND REMOVAL INSTRUCTIONS ................... 5
9.1 Installation.....................................................................................................................5
9.1.1 Site Setup................................................................................................................ 6
10.0 VERIFICATION/CALIBRATION ........................................................................ 6
10.1 Instrument Verification.................................................................................................6
10.1.1 Leak Test................................................................................................................. 7
10.1.2 Pressure Verification............................................................................................... 7
10.1.3 Ambient Temperature Verification......................................................................... 8
10.1.4 Flow Verification.................................................................................................... 8
10.1.5 PMT Verification.................................................................................................... 9
10.2 Instrument Calibration/Adjustment ..............................................................................10
10.2.1 Pressure Sensor Calibration.................................................................................. 11
10.2.2 Flow Calibration ................................................................................................... 11
10.2.3 PMT Adjustment................................................................................................... 12
11.0 MAINTENANCE PROCEDURES...................................................................... 13
11.1 Cleaning the T640 TSP Inlet.........................................................................................14
11.2 Changing the Disposable Filter Unit (DFU).................................................................15
11.3 Checking Pump Performance .......................................................................................17
11.4 Checking the Flow........................................................................................................17
11.5 Cleaning the Optical Chamber and the RH/T Sensor...................................................17
11.6 Inspecting the Sample Tubes........................................................................................20
12.0 TROUBLESHOOTING AND SERVICE ............................................................ 20
12.1 Fault Diagnosis .............................................................................................................20
12.2 Flow Problems ..............................................................................................................22

List of Figures
Figure 1 Pressure Verification Screen ............................................................................................ 8
Figure 2 Sample Flow Verification................................................................................................. 9
Figure 3 PMT adjustment Screen ................................................................................................. 10
Figure 4 Pressure Calibration Screen............................................................................................ 11
Figure 5 Flow Calibration Screen................................................................................................. 12
Figure 6 PMT Adjustment Screen ................................................................................................ 13
Figure 7 TSP Inlet......................................................................................................................... 15
Figure 8 Opening the Front Panel................................................................................................. 16
Figure 9 Internal DFU................................................................................................................... 16
Figure 10 ASC Support Removal................................................................................................. 17
Figure 11 Location of Optics Chamber and RH/T Sensor............................................................ 18
Figure 12 Optical Chamber Disassembly..................................................................................... 19
Figure 13 Optics Chamber Windows............................................................................................ 19
Figure 14 Final Dusting................................................................................................................ 20
List of Tables
Table 4-1 Terms and Definitions.................................................................................................... 3
Table 11-1 Maintenance Schedule................................................................................................ 14
Table 12-1 Alerts and Recommendations..................................................................................... 21

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1.0 PURPOSE
This document has been prepared for Field Technician use during routine, periodic and
calibration visits to ambient air monitoring sites in the Florida air monitoring network utilizing a
Teledyne API Model T640 PM2.5 Particulate Monitor. This document is not designed to cover
all the technical details that are included in the T640 instruction manual, or quality assurance
information in 40 Code of Federal Regulations (CFR) Parts 50, 53, and 58; EPA Technical
Assistance Documents (TAD's), and related reference materials. Adherence to this manual will
enable the site Field Technician to know and follow state-wide quality control/quality assurance
(QA/QC) requirements. Site Field Technicians however, should be knowledgeable of and refer
to the references noted in this Standard Operating Procedure (SOP).
2.0 SCOPE AND APPLICABILITY
The purpose of this SOP is to provide a set of uniform protocols for installation, operation,
maintenance, calibration, quality control (QC), and quality assurance (QA) of the Teledyne
Model T640 particulate matter (PM) monitor. The procedures are based on instructions set forth
in the manufacturer's manual; requirements specified in Appendix A to 40 CFR Part 58, and the
FDEP Quality Assurance Project Plan. They are intended for use by the operator during routine,
periodic, and unscheduled visits to the monitoring station.
All operations, maintenance, and procedures outlined in this SOP will be for the T640
configured for use in collecting PM2.5 data.
IMPORTANT: Before beginning any operation described in this document, ensure that any
related manuals and SOPs are available for reference.
3.0 SUMMARY OF THE COLLECTION METHOD
The Teledyne API Model T640 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 polychromatic light-emitting diode (LED).
There are two designated methods using the T640 instrumentation. The model T640 with 640
option (T640) is an approved Federal Equivalent Method (FEM) for PM10 [EQPM-0516-239],
PM2.5 [EQPM-0516-238] and PM10--2.5 [EQPM-0516-240], The T640 operates at a total flow
of
16.7 lpm and this SOP is written specifically for this method. The model T640 is an approved
FEM for PM2.5 [EQPM-0516-236]. The T640 also measures PM10 and PM10-2.5, but only the
PM2.5 fraction meets FEM requirements. The T640 operates at a total flow of 5.0 lpm.

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3.1 Principles of Operation
The Model T640 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. Briefly, the sampling head draws in
ambient air, which are 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.
The T640 operates at 5.0 lpm with a TSP inlet. This configuration is approved as an FEM for
PM2.5; however, it also provides data (not approved as an FEM) for PM10 and PM10-2.5.
Sample volume is reported in actual conditions by using the instruments ambient temperature
and barometric sensor data. Specific component operation is described in Section 6 of the T640
User Manual, which can be found at http://www.teledyne-
api.com/manuals/T640_User_Manual.pdf
4.0 DEFINITIONS AND CONVERSION FACTORS
PM2.5 is particulate matter with an aerodynamic diameter less than or equal to a nominal 2.5
µm.
Most technical terms in this SOP are defined as they are introduced. A few important definitions
are provided in Table 1.

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Table 4-1 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.
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.
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.

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Term Definition
Precision A measure of 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.
5.0 HEALTH AND SAFETY PRECAUTIONS
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 T640 into line power. High voltages are present inside the instrument. Ensure that the power
cord being used can carry the power rating of the instrument (see rear panel label). Note:
• Power connection must have 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 with 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 those after your procedures. Do not short or touch electric connections with
metallic tools while operating inside the monitor. For small shelter maintenance, beware of
external elements (i.e., weather conditions).
6.0 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.
7.0 PERSONNEL QUALIFICATIONS
Personnel who operate instruments used for the ambient monitoring of PM within the State of
Florida are typically selected for their position based on applying for the position and
demonstrating they have the required knowledge, skills, and abilities to perform the essential
elements of the position. Prior to independently operating PM monitoring equipment, personnel
are to be thoroughly trained in these duties. Supervisory/Management staff will then document
they have the required training and will then authorize the employee to perform the operations
outlined in this SOP.

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8.0 EQUIPMENT AND SUPPLIES
8.1 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.
8.1.1 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. 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 or vacuum grease.
5. Canned air for electronic use (e.g., Dust off, Blow Off 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 ¼” 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 Unit’s (DFU’s)
16. USB flash memory drive
9.0 INSTALLATION, STARTUP AND REMOVAL INSTRUCTIONS
Operators should read the manufacturer's Operating Manual and become familiar with the
monitor’s various controls and components prior to beginning operation. Since detailed
information for various procedures are contained in the manufacturer’s manual, it must be on
hand during any operator interaction with the Teledyne T640 monitor.
9.1 Installation
For the monitor to operate within EPA guidelines, the sample inlet must be located between 2
and 15 meters above ground level. If mounted on the roof top, the manufacturer specifies that
the entrance to the sample inlet must be at least 1 m (39 inches) above the roof. The user must
run a sampling tube through the roof of the monitoring site to the unit inside the shelter. The
portions of the main (sample) tubing located indoors should be properly insulated to help
prevent moisture problems from occurring. The sample (main) line must be in a straight,

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vertical line from the TSP inlet to the inlet of the Aerosol Sample Conditioner (ASC). Other
siting specifications are set forth in the FDEP PM2.5 Quality Assurance Project Plan, Rev.3:
05-12 and Title 40 of the Code of Federal Regulations (CFR), Part 58, Appendices D and E,
which must also be adhered to.
To satisfy these requirements, individual installations of the Teledyne Model T640 monitoring
system may vary depending on available site locations and shelter layout. The manufacturer’s
manual gives both general and detailed specifications for installation of the monitor and must be
followed where practical.
The hardware and software configurations must be completed before the T640 collects any
ambient data.
9.1.1 Site Setup
The T640 may be installed either in a monitoring shelter that contains existing monitoring
equipment or in a separate outdoor enclosure.
The T640’s acceptable shelter temperature range is 0 to 50º C. However, operating ambient air
instruments at 25ºC or lower can create large moisture issues during the summer because of the
presence of high ambient humidity. These issues must be satisfactorily addressed before
installing a T640 in an enclosure.
The shelter must be equipped with a wireless modem. This connection allows the operator to
remotely communicate with the TEOM via the manufacturer supplied computer software
Numaview, or other compatible software package.
The shelter/enclosure must also have a NIST Traceable Min/Max thermometer and be calibrated
annually by a NIST reference thermometer to verify operating temperatures within the
enclosure.
10.0 VERIFICATION/CALIBRATION
This section details the verification/calibration procedures periodically required to maintain
accurate particulate sampling of the T640.
10.1 Instrument Verification
There are five basic verification checks and three calibrations. There is no adjustment for either
the zero test or ambient temperature and as such failure of one or both checks results in the need
to troubleshoot rather than adjust a setting. The verifications/calibrations should always be
performed in a specific order as shown below:
1. Zero Test;
2. Pressure sensor verification;
3. Temperature sensor verification;
4. Flow sensor verifications;

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5. PMT verification using SpanDust™.
10.1.1 Leak Test
The internal components of the T640 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 pump is 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.”
1. Remove the inlet and fit a HEPA filter to the sample port. Ensure tubing isnot kinked.
2. Observe the PM values on the front panel display. Press either “Home”or the key.
3. Within at least 10 minutes, the PM values should be at zero (0.0) for each PMmetric.
4. If the PM values are not reading zero, then it’s likely to be one of twoissues:
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 ten minutes, values don’t reach zero (0.0), troubleshoot and repeat steps above.
6. Once PM values reach zero (0.0) for each PM metric, disconnect the HEPAfilter.
7. Record to “Monthly QC and Maintenance Sheet”.
10.1.2 Pressure Verification
The pressure measurement of the T640 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.
1. With the Pressure Standard operating and measuring the ambient pressure in the same room
as the T640 monitor, navigate to the Pressure Cal menu: >Calibration >Pressure Cal.
2. Compare the “Measured Pressure” in this screen to the Audit Pressure Standard (Figure 1).
3. The two values should be within +/- 10 mm Hg. If not follow the Calibrations procedure in
section ().
4. Record to “Monthly QC and Maintenance Sheet”.

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Figure 1 Pressure Verification Screen
10.1.3 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. Hold the temperature probe of the audit device near the gill screen holding the ambient
temperature probe of the T640x. If there is direct sun, 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.
2. Wait at least one minute for the audit device temperature to stabilize.
3. Record audit device ambient temperature and T640x ambient temperature to the “Monthly
QC and Maintenance sheet”.
4. Compare audit to T640 ambient temperature and if off by more than +/-2C, troubleshoot
and repeat.
5. If verification cannot meet tolerance replace temperature probe.
10.1.4 Flow Verification
Flow verifications for sample flow (5.0 lpm) can be conducted with the instrument operating
normally so long as the data are “in Maintenance”. Flow verifications are conducted on the
sample flow by going to the sample flow calibration menu at: >Calibration >Sample Flow Cal.

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Verification of Sample Flow (5.0 lpm), if necessary. For this 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. Ensure audit device is appropriately sized for 5.0 lpm flow.
2. Remove the inlet from 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 T640 running, go to the Calibration > Sample Flow Cal menu.
5. Wait at least one minute for the flow to re-stabilize.
6. Compare the “Measured Flow” in this screen to the Flow Standard (Figure 2) and determine
if these values differ by more than 5%. The acceptable flow rate tolerance is 4.75 – 5.25
lpm.
7. Record to “Monthly QC and Maintenance Sheet”. If sample flow meets expected tolerance,
then you are done with the sample flow verification. If sample flow is outside of the
acceptable perform a calibration of the sample flow defined in section ().
Figure 2 Sample Flow Verification
10.1.5 PMT Verification
The Particle Sensor PMT Verification uses SpanDust™, a monodisperse dust with a specific
refractive index. All T640 instrument PMTs have a very specific response to this span dust
which allows for the sensor to be checked in the field for drift caused by contamination of the
optics.

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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 monitors spectrometer and or RH sensor. Careful attention needs to be made
to 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 this procedure, ensure data are “in Maintenance”
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 T640 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 11.3 ± 0.5 (10.8 to 11.8 see Figure 3) record on
the Monthly QC and Maintenance Sheet.
Figure 3 PMT adjustment Screen
10.2 Instrument Calibration/Adjustment
1. Pressure Sensor Calibration.
2. Flow Calibration.
3. PMT Adjustment using SpanDust™.

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10.2.1 Pressure Sensor Calibration
The pressure measurement of the T640 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.
1. With the Pressure Standard operating and measuring the ambient pressure in the same room
as the T640 monitor, navigate to the Pressure Cal menu: >Calibration >Pressure Cal.
2. Compare the “Measured Pressure” in this screen to the Pressure Standard (Figure 4).
3. Press the value button next to the “Actual Pressure” field, enter the value measured by the
Pressure Standard, and press the “Calibrate” button on this screen. The Status should
change to “Success”.
4. Record to the Calibration Log.
The Measured Pressure value should change to closely match the Actual Pressure within a few
seconds
Figure 4 Pressure Calibration Screen
10.2.2 Flow Calibration
Flow calibrations for sample flow (5.0 lpm) can be conducted with the instrument operating
normally so long as the channels are “in Maintenance”. Flow calibrations are conducted on the
sample flow by going to the sample flow calibration menu at: >Calibration >Sample Flow Cal.
1. Set up your NIST-traceable flow standard transfer device with the appropriate inlet for the
flow to be calibrated. Ensure audit device is appropriately sized for 5.0 lpm flow.
2. Remove the inlet from 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 T640 running, go to the Calibration > Sample Flow Cal menu (Figure 5).

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5. Wait at least one minute for the flow to re-stabilize.
6. Press the value button next to the “Actual Flow” field, enter the value measured by the Flow
Standard, and press the “Calibrate” button on this screen. The Status should change to
“Success”.
The Measured Flow value should change to closely match the Actual Flow within a few
seconds.
Figure 5 Flow Calibration Screen
10.2.3 PMT Adjustment
The Particle Sensor PMT Calibration uses SpanDust™, a monodisperse dust with a specific
refractive index. All T640 instrument PMTs have a very specific response to this span dust
which allows for the sensor to be 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 of dust being used, but
simply a mechanism to Adjust the PMT response to particles with a specific and known
refractive index.
For this procedure, ensure channels are “In Maintenance.”
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 T640 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.

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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. If after two tries the Peak Channel reading is not at 11.3 ± 0.5 (10.8 to 11.8), then adjust the
PMT Setting by pressing the Peak Adjust left (decrement) or right (increment) buttons to
center the Peak voltage. 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 (Figure 12).
Figure 6 PMT Adjustment Screen
9. Allow 30 seconds for the Peak Channel reading in this screen to respond, and if it is not
at 11.3 ± 0.5, repeat the process. This could take several tries over a long period when
conducted in a humid environment.
10. Once the Peak Channel reading is at 11.3 ± 0.5, record to “Monthly QC and
Maintenance Sheet”.
11. Reattach the sample inlet and press the Stop button to stop the adjustment process and
resume normal data acquisition. For more information on the PMT Adjustment, use the
QR above to view a video by Teledyne API.
12. Wait 10 minutes, review data on home screen of T640x, and then bring unit back “On
Scan” in the data system.
11.0 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.

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Table 11-1 Maintenance Schedule
Maintenance Action
Tolerance
Frequency
Check for leaks with zero filter Stated as "Zero", (i.e., 0.0 for each PM
metric) Monthly
Clean Inlet and PM10 Well NA
Quarterly for inlet
Monthly for PM10 well
Check/Adjust PMT with SpanDust 1.28
(measured peak, limit value displayed on
bottle +/- 0.5)
11.3 +/- 0.5 (10.8 to 11.8)
Monthly at +/-0.5. Avoid over
performing this procedure. If
problems persist, wait 10 minutes
and retry.
Check Pump Performance (PWM/PID1 value < 80%) Monthly
Ambient Pressure +/- 10 mm Hg Monthly
Ambient Temperature +/- 2 C Monthly
Flow rate checks (see below)
Sample flow: 5.0 lpm
+/- 4% of standard; +/-5% of flow rate
design (4.75 – 5.75 lpm). For our
purposes use +/-5% of flow rate design.
Monthly
Inspect and clean optical chamber and
relative humidity/temperature (RH/T) sensor
NA
Every six months or as needed, e.g.,
high dust load
Change Disposable Fitler Unit (DFU) for 5-
lpm sample flow and 11.67 lpm bypass flow
(if installed)
NA
Quarterly or when Pimp PVM
value approaches 80%.
Inspect inner and outer sample tubes
NA
Monthly or as needed
11.1 Cleaning the T640 TSP Inlet
For this procedure, ensure the channels are “In Maintenance”

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Figure 7 TSP Inlet
1. Power off the pump from the Setup>Vars>Pump Control menu. Pump choices are auto, off,
and cleaning cycle. Press ‘edit’ and then ‘off’ to turn off the pump.
2. Remove the sampling inlet from the downtube.
3. Disassemble the sampling inlet (four screws on the underside of inlet base plate).
4. Carefully and thoroughly remove any dust deposits from inside the inlet.
5. Remove any insects or other debris from the filtering screen.
6. Clean all the components using water and a mild detergent, if necessary.
7. Dry all components thoroughly with a clean cloth and blow canned air through nozzles.
8. 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.
9. Re-assemble 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 put back in to hand- tight
pressure.
10. Reconnect to sampling line.
11. Power up the pump from the Setup>Vars>Pump Control menu. Press ‘edit’ and then ‘auto’
to turn the pump 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 in Table 6-1.
11.2 Changing the Disposable Filter Unit (DFU)
There is one DFU on the T640 for the 5.0 lpm pump
1. Power off the internal pump from the control menu: Setup> Vars> Pump > Edit> Off
>Done.

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2. Remove screws at sides of front panel, if installed.
3. Pull open the instrument’s front panel, using the front panel finger grips (Figure 7)
Figure 8 Opening the Front Panel
4. 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 8).
Figure 9 Internal DFU
5. Power on the internal pump from the control menu: Setup> Vars> Pump > Edit> Auto
>Done.