Agilent Technologies 6890 Series, Service Manual, Page: 530 / 867

5 of 10
Jun 2001
Error Codes and Internal Diagnostics
Agilent 6890 Gas Chromatograph Service Manual
Not Ready Messages 820
Detector not ready
Front det igniting
Back det igniting
Status message: Front det igniting or Back det igniting
The GC is not ready while the FID or FPD is going through the flame ignition
sequence. The messages will clear if the detector is turned off.
If the FID is unable to ignite, there may be a problem, and the detector may
eventually shutdown.
Front det adjusting
Back det adjusting
Status message: Front det adjusting or Back det adjusting
The GC will be not ready because the NPD or ECD is adjusting its baseline to
reach the offset (NPD) or output (ECD) setpoint. The ECD’s adjustment is
usually complete in 30 seconds. The NPD may take longer.
It is possible that the NPD will be unable to reach the setpoint if there is
contamination in the system (for example, if the gas is not pure enough or
the bead is damp) or if the bead is worn out. If the NPD cannot reach the
setpoint, you will not receive an error message; the GC will simply not become
ready.
Turn the detector off to clear the message.
Front det equib time
Back det equib time
Status message: Front det equib time or Back det equib time
The NPD has completed adjusting the offset and is now waiting for the value
to remain at the setpoint for the equilibration time. Equilibration time can be
changed from the Detector control menu.
The NPD may not be able to equilibrate if the system is contaminated or the
bead is worn out. In addition, changes in the room temperature could prevent
equilibration. The GC will become ready if the detector is turned off.