6. Open - Main Menu → Service Menu → Diagnostics Menu → Valve Menu.
7. Disable - Valve Sequencing → Disabled.
8. Close - Sample/Cal → Off.
9. Close - Internal Zero/Cal → Off.
10. Close - Pressurized Zero (OPT) → Off.
11. Close - Pressurized Span (OPT) → Off.
12. Allow the instrument time to evacuate the pneumatic system (the time required will depend on
the vacuum source used).
13. Close the shut off valve and record the vacuum indicated on the leak test jig. Wait for 3 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 sample cycle of the instrument.
14. If the instrument did not leak, skip to step 17.
15. Inspect the instrument’s plumbing looking for obvious damage. Check the condition of fittings,
sample filter holder plus the O-rings.
16. When the location of the leak has been determined, repair and re-run the leak check procedure.
17. 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.
18. Block the instrument’s Background Air Ports with Kynar 1/4” blocker nut.
19. Open - Sample/Cal → On.
20. Open the shut off valve.
21. Allow the instrument time to evacuate the pneumatic system (the time required will depend on
the vacuum source used).
22. Close the shut off valve and record the vacuum indicated on the leak test jig. Wait for 3 minutes
and observe the gauge on the leak test jig. It should not drop more than 5 kpa. If it has, a leak is
present within the zero cycle of the instrument.
23. If the instrument did not leak, skip to step 26.
24. Inspect the instrument’s plumbing looking for obvious damage. Check the condition of fittings and
O-rings from the calibration valve up to the background air port.
25. When the location of the leak has been determined, repair and re-run the leak check procedure.
26. Slowly release the vacuum by gradually loosening the Kynar 1/4” blocker nut on the Background
Air Port, until the instrument has returned to ambient pressure.
27. Block the instrument’s Calibration Ports with Kynar 1/4” blocker nut.
28. Open - Internal Zero/Cal → On.
29. Open the shut off valve.
30. Allow the instrument time to evacuate the pneumatic system (the time required will depend on
the vacuum source used).
31. Close the shut off valve and record the vacuum indicated on the leak test jig. Wait for 3 minutes
and observe the gauge on the leak test jig. It should not drop more than 5 kpa. If it has, a leak is
present within the span calibration cycle of the instrument.
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