INFICON MicroFID II Portable Flame Ionization Detector - Manual (Page 83)

074-579-P1A 83
If you will be using the MicroFID II in a highly contaminated area where it is
possible the oxygen content is below 10%, watch for indications of
reduced flame height such as lowered detection limits or a flame out
fault.
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 sub zero 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 MicroFID II within the operating
temperature range of 32°F (0°C) to 122°F (50°C).
Action: Replace the exhaust filter with a new or unblocked one. If this does not solve the
flame out issue, contact INFICON local service personnel.
Cause: Hydrogen supply lines are full of air.
Action: If the MicroFID II has not been used for some time, it is possible that the
hydrogen supply lines contain air. Fill the hydrogen cylinder and then open the
hydrogen shut-off valve. Allow the hydrogen to purge the system for about 5
minutes and then turn on the MicroFID II to start the flame.
Cause: Hydrogen supply lines are blocked.
Action: Contact the Service Department.
Problem: Liquid has been aspirated.
Cause: The MicroFID II has been exposed to a liquid or condensing vapor that can pass through
the Teflon/Polypropylene filter.
Action: Contact the Service Department.