4. Connect a vacuum source to the shut off valve ensuring the shut off valve is in the open position.
Figure 123 – Connect Vacuum Source
5. Open - Main Menu → Service Menu → Diagnostics Menu → Valve Menu.
6. Disable - Valve Sequencing → Disabled.
7. OFF - Sample/Cal → OFF.
8. OFF - Background/Measure → OFF.
9. OFF - Pressurized Zero (OPT) → OFF.
10. Block the instrument’s sample port with a Kynar 1/4” blocker nut.
Figure 124 – Kynar Blocker Nut
11. Allow the instrument time to evacuate the pneumatic system (the time required will depend on
the vacuum source used).
12. 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 sample cycle of the instrument.
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