Fpd Does Not Ignite - Agilent Technologies 7890 Series Troubleshooting Manual

2
ALS and Detector Symptoms

FPD Does Not Ignite

34
• Check that the FPD temperature is high enough for ignition
(> 150 °C).
• Check FPD flow rates and that they match the type of filter
installed in the FPD. The hydrogen:air ratio greatly impacts
ignition. Nonoptimal flow settings can prevent flame
ignition.
Table 1 FPD+ recommended flows
Carrier (hydrogen, helium, nitrogen, argon)
Packed columns
Capillary columns
Detector gases
Hydrogen
Air
Carrier + makeup
Table 2 FPD recommended flows
Carrier (hydrogen, helium, nitrogen, argon)
Packed columns
Capillary columns
Detector gases
Hydrogen
Air
Carrier + makeup
• Measure the actual detector flows. (See
Detector Flow.)
• The column may be
• Check that the FPD ignitor operates. (See
FPD Flame Is Lit.)
Sulfur mode flows,
mL/min
10 to 60
1 to 5
60
60
60
Sulfur mode flows,
mL/min
10 to 60
1 to 5
50
60
60
To Measure a
installed too high into the detector.
Agilent 7890 Series Troubleshooting
Phosphorus mode
flows, mL/min
10 to 60
1 to 5
60
60
60
Phosphorus mode
flows, mL/min
10 to 60
1 to 5
75
100
60
To Verify That the