INFICON MicroFID II Portable Flame Ionization Detector - Manual (Page 75)

074-579-P1A 75
Maintenance of the Flame Ionization Detector
The MicroFID II detector is a not a field replaceable unit (FRU) and should not be serviced by
the user. Any problems which are occurring with the detector should be directed to INFICON
Service.
Replacing Inlet Filter
The MicroFID II uses a filters located in the instrument inlet. The filter is designed to remove
dust and water to reduce detector contamination. As the filter collects dust, the MicroFID II
’s
inlet flow rate and sensitivity decrease. The filter will not allow water to pass through, but the
filter will not stop all solvents.
NOTE: Do not aspirate liquid samples with MicroFID II!
Replace the filter on a monthly basis, or more frequently if the MicroFID II is used in a dusty or
wet environment. You must replace the filter if the MicroFID II has been exposed to liquid water.
The pump will sound labored when the filter requires replacement.
CAUTION: Do not replace the inlet filter in a hazardous location.
1. Turn off the instrument. Unscrew the filter housing from the probe housing or unit
housing. Be careful not to lose the O-ring seal. See Figure 35
Figure 34. Inlet Filter
2. Remove the Teflon/Polypropylene filter and install the new filter (Part No. MX396015).
Place the filter in the filter housing with the Teflon side facing outward in the filter
housing and the polypropylene mesh side facing the MicroFID II unit. Handle the filter
disk only by the edges. The mesh may be damaged or contaminated by excessive
handling. Use forceps if possible.
NOTE: Each filter is protected by a piece of blue plastic. Remove the plastic
before installing the filter in MicroFID II.