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Agilent Technologies 7890 Series - FID or NPD Measured Hydrogen and Makeup Gas Flows Much Less than Setpoint

Agilent Technologies 7890 Series
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104 Agilent 7890 Series Troubleshooting
4 GC Not Ready Symptoms
FID or NPD Measured Hydrogen and Makeup Gas Flows Much Less Than
Setpoint
Check for a clogged or partially clogged jet. A clogged jet
creates backpressure. Since the flow module uses pressure
control, the increased backpressure simulates proper flow.
The actual flow rate will drop but the GC remains functional.
See:
To Check for a Plugged FID Jet
To Check for a Plugged NPD Jet
Check for a column fitting leak at the detector base.
Replace the FID or NPD jet.

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