Pmt Verification; Figure 2 Sample Flow Verification - Teledyne T640 Standard Operating Procedure

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 ().

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.

Figure 2 Sample Flow Verification

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DEP 03-21
Revision No. 0
November 2017