13. If the instrument did not leak, skip to step 16.
Figure 125 – Pressure Gauge on Leak Test Jig
14. Inspect the instrument’s plumbing looking for obvious damage. Check the condition of fittings,
sample filter holder plus the O-rings.
15. When the location of the leak has been determined, repair and re-run the leak check procedure.
16. Slowly release the vacuum by gradually loosening the Kynar 1/4” blocker nut on the Sample Port
until the instrument has returned to ambient pressure.
17. Open - Sample/Cal → Open.
18. Open the shut off valve.
19. Block the instrument’s Calibration Port with a Kynar 1/4” blocker nut.
20. Allow the instrument time to evacuate the pneumatic system (the time required will depend on
the vacuum source used).
21. Close the shut off valve and record the vacuum indicated on the leak test jig. Wait for three minutes
and observe the gauge on the leak test jig. It should not drop more than 5 kpa (37.5 torr). If it has,
a leak is present within the calibration cycle of the instrument.
22. If the instrument did not leak, skip to step 26.
23. If you passed the first leak check on the sample side then the leak is between the calibration valve
manifold and the calibration port.
24. Repair and re-run the leak check procedure.
25. Slowly release the vacuum by gradually loosening the Kynar 1/4” blocker nut on the calibration
port until the instrument has returned to ambient pressure.
26. Open - Main Menu → Service Menu → Diagnostics Menu → Valve Menu.
27. Disable - Valve Sequencing → Enabled.
28. Inspect the tubing again ensuring the tubing is cleanly connected to the fittings.
29. Remove the leak check jig and return the instrument to normal operation.
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