Fid Or Npd Measured Hydrogen And Makeup Gas Flows Much Less Than Setpoint - Agilent Technologies 7890 Series Troubleshooting Manual

4
GC Not Ready Symptoms
FID or NPD Measured Hydrogen and Makeup Gas Flows Much Less Than
Setpoint
104
• 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
"To Check for a Plugged NPD
• Check for a column fitting leak at the detector base.
• Replace the FID or
Jet"
Jet"
NPD jet.
Agilent 7890 Series Troubleshooting