16. Toggle OFF - Internal Pump → Off.
17. Note the value on the barometer. Wait for 3 minutes, the value should not drop more than 5 kpa
(37.5 torr). If the leak check passed skip to step 20.
18. Inspect the instrument’s plumbing looking for obvious damage. Check the condition of fittings,
sample filter holder plus the O-rings.
19. If the leak is still present divide up the pneumatic system into discrete sections to locate the leak
(refer to Section 9.5). When the location of the leak has been determined repair and then rerun
the leak check procedure.
20. Slowly remove the barometer from the Sample Port, allowing the instrument to return to ambient
pressure.
21. Turn the manual stop valve 90° (Open).
22. Toggle ON - Internal Pump → On.
23. Open - Sample/Cal → On.
24. Connect the barometer to Background Air port.
25. Allow the internal pump to time to evacuate the pneumatic system (the time required will depend
on the condition of the pump 1 - 2 minutes).
26. Turn the manual stop valve 90° (Close).
27. Open - Main Menu → Service Menu → Diagnostics Menu → Internal Pump Menu.
28. Toggle OFF - Internal Pump → Off.
29. Note the value on the barometer. Wait for 3 minutes, the value should not drop more than 5 kpa
(37.5 torr). If the leak check passed skip to step 32.
30. 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.
31. When the location of the leak has been determined, repair and re-run the leak check procedure.
32. Slowly remove the barometer from the Background Air Port, allowing the instrument to return to
ambient pressure.
33. Turn the manual stop valve 90° (Open).
34. Toggle ON - Internal Pump → On.
35. Open - Internal Zero/Cal → On.
36. Connect the barometer to Calibration port.
37. Turn the manual stop valve 90° (Close).
38. Open - Main Menu → Service Menu → Diagnostics Menu → Internal Pump Menu.
39. Toggle OFF - Internal Pump → Off.
40. Note the value on the barometer. Wait for 3 minutes, the value should not drop more than 5 kpa
(37.5 torr). If the leak check passed skip to step 43.
41. Inspect the instrument’s plumbing looking for obvious damage. Check the condition of fittings and
O-rings from the calibration valve manifold up to the Calibration port.
42. When the location of the leak has been determined, repair and re-run the leak check procedure.
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