12. Connect the barometer to Sample Port.
Figure 127 – Barometer to Sample Port
13. Allow the internal pump time to evacuate the pneumatic system (the time required will depend on
the condition of the pump, 1 - 2 minutes).
14. Open - Main Menu → Service Menu → Diagnostics Menu → Internal Pump Menu.
15. Toggle Off - Internal Pump → Off.
16. Note the value on the barometer. Wait for three minutes, the value should not drop more than
5 kpa (37.5 torr). If the leak check passed skip to step 20.
17. If there was a leak, toggle the pump on again and repeat step 13 - 16, but this time before toggling
OFF the pump turn the manual stop valve 90° located inside the chassis just before the inlet of the
flow block. This will isolate the internal pump. 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 and 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. On - Sample/Cal → ON.
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