Emerson Rosemount 700XA Reference Manual page 141

July 2020
Recommended actions
1. In MON2020, click Open H2 Valve.
The H2 Valve Cur State field changes to Open.
2. Click Ignite.
The Flame Status field changes when the internal temperature exceeds the value set in the Flame On Sense Temp field.
Note
If the Flame Ignition field is set to Auto, the GC will automatically restart the flow if it goes out.
3. If the GC fails to light after resetting the electrometer, recheck the air and hydrogen flow.
For more information on the FPD, see
Flame Over Temperature
Detector 1 flame over temperature.
The flame ionization detector (FID) flame temperature is above safe limits set at the factory. The FID flame has been extinguished,
the fuel supply valve closed, and automatic analyses halted.
Recommended actions
1. Confirm that both fuel and air cylinders are connected and contain sufficient pressure.
2. Confirm that fuel and air set points are set to achieve desired mixture.
3. Use the local operator interface (LOI) or MON2020 to ignite the FID.
Detector (1-3) Scaling Factor Failure
The gas chromatograph (GC) detected an excess scaling factor deviation for the detector.
Recommended action
Replace the preamp board.
The preamp boards for detectors 1 and 2 are located in Preamp 1.
The preamp board for detector 3 is located in Preamp 2.
No sample flow (1 or 2)
This alarm applies to the optional sample flow switch. The corresponding flow switch indicates that there is no sample flow in the
gas chromatograph (GC).
Recommended actions
Check the sample gas rotameter in the sample conditioning system for flow.
• If no gas flow or no rotameter is present:
a. Confirm that there is gas flow at the sample point location.
b. Ensure that the sample valves in the sample conditioning system are open.
c. Ensure that the bypass return vent path is free of obstruction.
d. Confirm that the sample line is connected from the sample point to the GC's sample conditioning system and is free
of obstructions.
e. Close the valve at the sample tap, remove pressure from the line, and check the filters at the probe, the sample
conditioning system, or both. If they are filled with liquids or particulates, replace the filtering elements.
• If automatic stream selection valves are present, confirm that they are operating properly.
• If a slight sample gas flow is present at the rotameter in the sample conditioning system, drain or replace all filters.
• If you observe flow in the rotameter, replace the sample flow switch.
Rosemount 700XA
Micro flame photometric detector (µFPD).
141