Diagnostics; Shutdown Behavior - Agilent Technologies 6890 Series Service Manual

Gas chromatograph

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Programmed Temperature Vaporization Inlet (PTV)

Diagnostics

Cryo timeout—When a run does not start within a specified time after the

oven equilibrates, cryo timeout occurs and the inlet temperature shuts down.

Cryo fault—Shuts down the inlet temperature if it does not reach setpoint

in 16 minutes of continuous cryo operation. Note that this is the time to reach

the setpoint, not the time to stabilize and become ready at the setpoint.

Both Cryo timeout and Cryo fault can cause cryo shutdown. If this happens,

the inlet heater is turned off and the cryo valve closes. The GC beeps and

displays this message:

The inlet heater is monitored to avoid overheating. If the heater remains on

at full power for more than 2 minutes, the heater is shut down. The GC beeps

and displays this message:

To recover from either condition, turn the GC off, then on, or enter a new

Agilent 6890 Gas Chromatograph Service Manual

6890a 6890 plus