Ambient Temperature Verification; Flow Verification; Figure 1 Pressure Verification Screen - Teledyne T640 Standard Operating Procedure

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.

Figure 1 Pressure Verification Screen

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DEP 03-21
Revision No. 0
November 2017