152 User Information
Maintaining the Instrument
Pressure decay test part 2: 6-port valve standby mode (optional)
This section consists of two pressure decay tests. The tests
check for internal cross leaks in the 6-port valve in standby
mode. To skip this section, proceed to Pressure decay test part
3: Inject mode.
1 Loosen or disconnect the carrier gas connection at the
transfer line. The Carrier (PSI) reading should drop to almost
0 PSI within 1 minute.
2 Print Table 15. Record the time and initial vial pressure in
the table.
3 Allow 5 minutes to pass. Record the final time and pressure
values in Table 15. A pressure decay of more than 2 psi over
5 minutes indicates a leak. If there is a leak, call an Agilent
service representative. If there is no leak, proceed to step 4.
4 Tighten or reconnect the carrier gas connection at the
Transfer line. Open the shutoff valve to pressurize the carrier
flow path. The Carrier (PSI) should recharge within
1 minute.
5 Open the lid. The sample probe disengages from the leak test
vial. The Vial (PSI) should drop within a minute to almost 0
psi.
6 Turn off the carrier shutoff valve at the back of the
instrument.
7 Print Table 16. Write the time and initial pressure values in
the table.
Tabl e 15 Pressure decay test part 2A
Final time Initial time Difference
Time 5 minutes
Flow path Initial pressure Final pressure
Vial pressurization
medium_standard.book Page 152 Tuesday, February 17, 2004 10:14 AM
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