To Run The Inlet Trap Check - Agilent Technologies 7890 Series Troubleshooting Manual

To Run the Inlet Trap Check

Agilent 7890 Series Troubleshooting
From the GC keypad:
Press [Service Mode], scroll to Front inlet trap check or Back inlet
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trap check, then press [Enter]. The display will be similar to
Figure 5:
FRONT INLET TRAP CHECK
Inlet Pressure
Test Inlet
Test flow rate
Warning if pressure check OFF
Fault if pressure check
Last test results
Tue Oct 20 16:07 2009
Test pressure OK:
Reset the test results? (yes)
Figure 5 Example front inlet trap check display. Example assumes a
test has been previously run. Scroll to see all lines of the
display.
Scroll to Test flow rate and enter a flow rate. A typical flow
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rate for this test is 400 mL/min for helium and hydrogen
carrier gas, or 150 ml/min for nitrogen carrier gas, but you
may find other values more appropriate for your setup.
Scroll to Test Inlet and press [On/Yes] to start the test.
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Wait while the pressure stabilizes. When stable, the Test Inlet
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line of the display changes to Test pressure OK x.xx, where
x.xx is the current pressure.
If the inlet cannot achieve the test setpoint, check for a leak
(at the inlet, split vent trap, or split vent line) or low supply
gas pressure.
Note the resulting Inlet Pressure. If the measured pressure
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exceeds any limits you have set up, the GC will respond
accordingly. See "To Check or Monitor Split Vent Line
Backpressure".
Typical pressures for a clean split flow path are:
• 1–2 psi (7–14 kPa) at 400 mL/min for a split liner
• 3–10 psi (21–69 kPa) at 400 mL/min for a splitless liner
Troubleshooting Tasks
5.471 psi<
(ON to Start)
400mL/min
OFF
4.8
8
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