Maintaining the Instrument
User Information 151
Pressure decay test part 1: Standby mode
The first pressure decay test checks for leaks in standby mode.
Perform the following steps to run the pressure decay test:
1 Pressurize the flow paths for at least 5 minutes.
2 Turn off the shutoff valves at the back of the instrument.
3 Print Table 14. Write the time and initial pressure values in
the table.
4 Allow 5 minutes to pass. Record the final time and pressure
values in Table 14.
A pressure decay of more than 2 psi over 5 minutes indicates a
leak. Be sure that the leak is not at the transfer line.
• A leak in the carrier flow path indicates a possible leak at
port 2 or 3 of the 6 port valve.
• A leak in the vial pressurization flowpath indicates a
possible leak at port 1, 4, 5, or 6 of the 6 port valve.
Fix any leaks before continuing the leak test. Once all of the
fittings have been tightened, start the pressure decay test again.
If the pressure decay test still shows a leak or if the leak could
not be fixed or located, call an Agilent service representative.
Tabl e 14 Pressure decay test part 1
Final time Initial time Difference
Time 5 minutes
Flow path Initial pressure Final pressure
Carrier
Vial pressurization
medium_standard.book Page 151 Tuesday, February 17, 2004 10:14 AM
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