89
Agilent 7890 Series Gas Chromatograph
Troubleshooting
Agilent Technologies
4
GC Not Ready Symptoms
GC Never Becomes Ready 90
Flow Never Becomes Ready 91
Oven Temperature Never Cools Down/Cools Very Slowly 92
Oven Never Heats Up 93
Temperature Never Becomes Ready 94
Cannot Set a Flow or Pressure 95
A Gas Does Not Reach Setpoint Pressure or Flow 96
A Gas Exceeds Pressure Setpoint or Flow 97
The Inlet Pressure or Flow Fluctuates 98
Cannot Maintain a Pressure as Low as the Setpoint on a Split Inlet 99
The Measured Column Flow Does Not Equal the Displayed Flow 100
FID Does Not Ignite 101
FID Ignitor Does Not Glow During Injection Sequence 102
FID or NPD Measured Hydrogen and Makeup Gas Flows Much Less Than
Setpoint 104
NPD Adjust Offset Process Fails 105
FPD Does Not Ignite 106
Valve Not Ready 108
Blinking Not Ready Light: Detector Hardware Fault/TCD Filament
Voltage 109
This section includes faults and symptoms that will occur when
the GC is on but cannot perform analyses. This is indicated by a
“Not Ready” warning, by fault messages, or by other symptoms.
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