INFICON DataFID Portable Flame Ionization Detector for Leak Detection and Repair (LDAR) - Manual (Page 87)

074-578-P1A 87
Problem: Sample flow rate varies from 600 ml/min. +/- 10%.
Cause: Inlet filter has not been installed.
Action: Install an inlet filter into the inlet filter cap.
Cause: Inlet filter cap has not been tightened onto the detector cap.
Action: Finger-tighten the filter cap.
Cause: Inlet filter is plugged.
Action: Replace the inlet filter
Cause: Pump has been damaged.
Action: Contact the INFICON local service personnel.
Cause: Exhaust port is blocked.
Action: At low temperatures, water vapor, a by-product of the hydrogen flame, may
condense at the exhaust port. At subzero temperatures the water vapor will
freeze and obstruct the exhaust port. If the exhaust port becomes obstructed,
pump operation will be inhibited. Flame out may also result. Operate the DataFID
within the operating temperature range of 0° to 50°C (32 to 122°F).
Action: The exhaust frit has become plugged. Contact the INFICON local service
personnel.
Problem: Flame will not ignite.
Cause: The hydrogen gas has run out.
Action: Ensure the shut-off valve is open.
Action: Refill the hydrogen fuel cylinder if necessary.
Cause: Oxygen supply is deficient.
Action: Ensure there is an adequate supply of oxygen. Do not attempt to ignite the flame
in a location where there is greater than 10,000 ppm methane or the equivalent
concentration of a flammable gas. Move to a location where there are lower
concentrations and start the flame and then begin sampling higher
concentrations.
If the flame goes out while you are sampling very high concentrations, it is
possible that 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. 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.