Locating Leaks - Agilent Technologies 6890 Series Service Manual

230 Cool On-Column Inlet
Leak testing EPC and manual inlets
2. Check the actual pressure on the display and monitor it for 10 minutes.
Pressure loss should not be greater than 0.5 psi.

Locating leaks

If the EPC module appears to have a leak, you can remove it to locate the
leaky component. The leak test kit (part no. G1530-60960) contains a longer
ribbon cable to allow you to lay the EPC module on the benchtop for testing.
Caution Be sure to wear an ESD strap grounded to the 6890 GC chassis while
performing this procedure.
1. Turn off the main power switch.
2. Disconnect the carrier supply tubing on the inlet fitting.
3. Remove the top plastic pneumatics cover and the detector cover.
4. Remove the RFI shield and the top rear cover on the GC.
5. Disconnect the ribbon cable for the module from the main EPC board.
You may have to remove the adjacent ribbon cable also.
6. Use a Torx T-20 screwdriver to remove the screw from the top of the
module and slide the module out of the back of the GC.
7. Connect one end of the leak test ribbon cable (G1530-61370) to the ribbon
cable connector on the EPC module and connect the other end to the
appropriate connector on the EPC board.
8. Reconnect the carrier supply fitting and set pressures as used in the leak
test.
9. Lay the EPC module on the lab bench and use an electronic leak detector
to locate the leaky component on the module.
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Inlets
Agilent 6890 Gas Chromatograph Service Manual
Jun 2001