Agilent Technologies 6890 Series Service Manual page 62

Gas chromatograph

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Note the "Actual" reading on the display and monitor the pressure for

You can use the stopwatch feature of the 6890 GC to monitor the time.

time and the pressure reading with the

Back Inlet] keys.

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.

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.

Agilent 6890 Gas Chromatograph Service Manual

Split/Splitless Inlet

Leak testing—EPC and manual inlets

to start timing, then toggle between the

Troubleshooting

6890a 6890 plus