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Maintenance
Leak Test
Thermo Scientific
42iQD Instruction Manual
5-9
Use the following procedure to perform a leak test.
Equipment Required:
Swage Lock cap (sample port)
Small rubber cap (Perm Dryer filter)
Vacuum Tester with Gauge (with a resolution of .5 in Hg or better)
1.
Turn instrument OFF, unplug the power cord.
2.
Block the SAMPLE bulkhead on the rear panel with a leak-tight cap.
3.
Cap the filter at the end of the Perm Dryer.
4.
Disconnect the 1/4-inch tube which connects the pump to the
converter.
5.
Connect the vacuum tester tool to the disconnected 1/4-inch tube
going to the converter.
6.
Squeeze trigger until gauge reads to pull in 10 in Hg.
7.
Observe vacuum gauge for stable reading for 10 minutes. If reading
remains at 10 in Hg, no leak is present.
Note
Acceptable leak rate is .5 in Hg over 10 minutes.
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Leak Test
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