Emerson Rosemount 700XA Reference Manual page 188

Troubleshooting
June 2022
6.1.14 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
6.1.15 Detector Scaling Factor Failure
The gas chromatograph (GC) detected an excess scaling factor deviation for the detector.
Detectors 1-3.
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.
6.1.16 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.
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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 Rosemount MON2020 to ignite the
FID.
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 obstruction.
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.
Reference Manual
2-3-9000-744
Emerson.com/Rosemount