220 Purged/Packed Inlet
Leak testing—EPC and manual inlets
14 of 20
Jun 2001
Inlets
Agilent 6890 Gas Chromatograph Service Manual
Performing the leak test—manual inlets
Note Be sure to complete all of the preparation steps on pages 10 and 11 before
continuing.
1. Set the carrier supply pressure to 30 psi.
2. Turn the flow controller about six turns counter-clockwise. The pressure
gauge will increase to a value less than the supply pressure.
3. Wait 10 minutes for pressure equilibration. The gauge on the front panel
should be stable.
4. After 10 minutes, shut off the column head pressure by turning the flow
controller full clockwise. Do not overtighten or you will damage the valve
seat.
Figure 220-11 Inlet manifold
5. Monitor the pressure gauge for 10 minutes.
• If there is less than 0.7 psi pressure loss (0.07 psi/min), consider the
system leak tight.
Pressure gauge
Flow controller
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