VS Series Helium Mass Spectrometer Leak Detectors
3-18
DRAFT 4/
23/15
3.1.7.2 Vacuum (Low Pressure) Calibration
To perform Va c uum Calibrati o n :
1. Verify that the leak detector is in the System Ready condition and that a test port cap is
in place.
2. If the system is not already in Vent mode, press VENT.
3. Press Test and verify that the leak detector transfers to Fine Test mode,
displaying
10
9
atm cc/sec or lower.
4. Wait approximately 5 minutes for the vacuum system pressure to stabilize.
5. Press Test Port Vacuum.
You will receive one of the following messages:
❑ A Cal OK indicator, to the right of the Test Port TC Zero box confirms that the
calibration was successful.
❑ A Failed message indicates that the calibration was not successful.
A Failed message results from a defective or contaminated thermocouple gauge, or
the fact that the actual pressure was not at or near zero. Verify the latter case using an
appropriate vacuum gauge installed on the test port.
6. Press Done to leave the screen and return to the previous menu.
3.1.7.3 Atmospheric Calibration
To perform A t m o s p h eric Calibra t i o n :
1. If the system is not already in Vent mode, press VENT.
2. Wait approximately ten seconds for the test port pressure to stabilize, then move to the
Gauge Calibration screen (
Figure 3-13 on page 3-17).
3. Press Test Port Atm.
You will receive one of the following messages:
❑ A Cal OK indication, to the right of the Test Port TC Atm box, confirms that the
calibration was successful.
❑ A Failed message indicates that the calibration was not successful. This is the result
of a defective or contaminated thermocouple gauge, or that the actual pressure was
not at or near atmosphere. Verify the latter case using an appropriate vacuum gauge
installed on the test port.
4. Press Done to leave the screen and return to the previous menu.
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