820 Not Ready Messages
Detector not ready
4 of 10
Jun 2001
Error Codes and Internal Diagnostics
Agilent 6890 Gas Chromatograph Service Manual
Detector not ready
Some not ready conditions are specific to detectors. These are:
• The detector temperature is below the minimum temperature for
igniting.
• The detector is igniting.
• The detector offset is adjusting.
• The detector is equilibrating.
• The detector’s pneumatics failed.
Front det waiting
Back det waiting
Status message: Front det waiting or Back det waiting
To prevent condensation, the FID and FPD temperatures must be at least
150°C before they can ignite.The NPD must be at least 150°C before the bead
voltage is applied. The TCD must be at 100°C to turn on the filament, because
at lower temperatures the filament sags. If the temperatures are below the
minimum, the GC will not be ready.
Usually, the detector will reach the setpoint temperature and become ready.
However, if the detector is unable to reach a temperature high enough for
ignition or turn on, the instrument will remain not ready indefinitely.
❐ Make sure that the detector temperature setpoint is high enough. Raise
it if it is too low.
❐ If the detector temperature setpoint is high enough but the detector is
unable to reach it, the detector heater may have failed or the sensor or
mainboard may be bad.
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