INFICON MicroFID II Portable Flame Ionization Detector - Manual (Page 78)

074-579-P1A 78
7. TROUBLE SHOOTING
General Information
If you have a service related question about the MicroFID II, consult this manual first. If you cannot find
the answer in this documentation, contact the INFICON Service Department.
When you call, you should have your MicroFID II in front of you. You should also have this manual at
hand.
Lastly, please have the following information ready:
1. A description of what happened and what you were doing when the problem occurred.
2. Any corrective action that has been taken.
3. The exact wording of any messages that appeared on the display.
WARNING
Do not service the MicroFID II in a hazardous location.
MicroFID II Fault Messages
When the “Check” status is displayed, the MicroFID II’s operation is compromised. Go to the “View menu
– List error codes” menu selection to obtain a description of the fault. One exception is the flame out fault.
When a Flame-out fault occurs, the instrument
display will show “flame out”.
Fault: Detector flame has gone out.
Cause: The hydrogen gas has run out.
Action: Ensure the shut-off valve is open.
Action: Refill the hydrogen cylinder if necessary
Cause: Oxygen supply is deficient.
Action: Ensure there is an adequate supply of oxygen. If you are
sampling very high concentrations, it is possible you are sampling
above the flame out concentration. The flame out concentration
for methane is approximately 52,000 ppm (5.2% methane in air).
A minimum of 17% oxygen is required to start the hydrogen
flame. The oxygen is supplied from the sample as it is drawn in
by the pump. A minimum of 10% oxygen is required to maintain
the hydrogen flame.