Agilent Technologies 6890 Series Service Manual page 528

Pressure and/or flow not ready
A run will not start until all pressurized areas have reached their setpoints
and maintained them for 6 seconds. The acceptable pressure range of a
pressurized area will be between 0.05 and 0.5 psi, depending on its type of
sensor.
Similarly, the GC will not be ready to begin a run until flows are within
1 mL/min of the setpoint range and remain in the range for 6 seconds.
Pressure zones that are turned off are considered ready.
If the zone does not become ready within a specified time, the GC goes into
the shutdown mode. See Section 840, Shutdowns, for more information.
Table 820-1
Status message
Front/Back inlet
pressure
Front/Back inlet flow
Front/Back det air flow
Front/Back det ref flow
Front/Back det anode
gas
F/B det makeup gas
Front/Back det H
Aux 3/4/5 pressure
Gas saver
Jun 2001
Pressure and/or Flow Not Ready Messages
Comments
Pressure not at setpoint
Flow not at setpoint
For FID, NPD or FPD—Gas supply turned off (manual) or not at
setpoint (EPC)
For TCD—Gas supply turned off (manual) or not at setpoint (EPC)
For ECD or µ-ECD—Gas supply turned off (manual) or not at
setpoint (EPC)
Gas supply turned off
flow Gas supply turned off
2
Pressure not at setpoint
One of the inlets is in gas saver mode. Press Prep Run to clear.
Error Codes and Internal Diagnostics
Agilent 6890 Gas Chromatograph Service Manual
Not Ready Messages
Pressure and/or flow not ready
820
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