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Jun 2001
Inlets
Agilent 6890 Gas Chromatograph Service Manual
Split/Splitless Inlet 210
Leak testing—EPC and manual inlets
7. Note the “Actual” reading on the display and monitor the pressure for
10 minutes.
You can use the stopwatch feature of the 6890 GC to monitor the time.
Press
[Time] and then [Enter] to start timing, then toggle between the
time and the pressure reading with the
[Time] and the [Front Inlet]/
[Back Inlet] keys.
• If there is less than 0.5 psi pressure loss (approximately 0.05 psi/
min), consider the system leak tight.
• If pressure loss is much greater than 0.5 psi, there is a leak that must
be found and corrected. Note, however, that you may want to slightly
decrease the leak test time based on the internal inlet volume, which
changes with the liner type used (smaller volumes = shorter
acceptable leak test times). See Correcting leaks later in this section.
• If there is a rise in pressure, see Forward pressure valve leaks below.
8. When the system is considered leak tight, the caps may be removed, the
column reinstalled, its dimensions configured at keyboard, and the
desired pressure and flow rate set.
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