148 User Information
Maintaining the Instrument
Leak Test
A leak test checks for the following:
• Restrictions in the flow path associated with filling the loop
• Leaks in the carrier flow path
• Leaks in the vial pressurization flow path
• Leaks across the 6-port sampling valve
The most common leaks are at the connections of the transfer
line, external plumbing, and sample probe union.
Required tools
• Beaker of water
• 20-mL capped vial
• Leak test kit G1888-60701
• 7 × 8-mm wrenches
• This test can be facilitated using the Advanced Function 5
diagnostic tool located on the CD ROM.
Setup
1 Attach the 1/8-inch od tubing to the vent with a Swagelok
connection. Finger tighten the connection.
2 Place the free end of the tube in a beaker of water.
3 If needed, install a shut-off valve between the gas source and
the bulkhead fitting for carrier and vial pressurization gas.
Install the valves on the back of the Headspace Sampler
between the bulkhead fittings and the gas source.
4 For EPC setups, add a T-fitting connecting the shutoff valves
on the carrier gas and vial pressurization gas inlets.
5 Change the pressure units to PSI. This setting has better
resolution than kPa or Bar. See page 73.
6 Set the source pressure to 30 PSI.
medium_standard.book Page 148 Tuesday, February 17, 2004 10:14 AM
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