Leak Test; Pressure Verification - Teledyne T640 Standard Operating Procedure

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 is not kinked.
2. Observe the PM values on the front panel display. Press either "Home" or the
3. Within at least 10 minutes, the PM values should be at zero (0.0) for each PM metric.
4. If the PM values are not reading zero, then it's likely to be one of two issues:


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 HEPA filter.
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".
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.
7
DEP 03-21
Revision No. 0
November 2017
key.