INFICON MicroFID II Portable Flame Ionization Detector - Manual (Page 56)

074-579-P1A 56
memory slot 1
Compound Selection and Response Factors
The response of a flame ionization detector to a compound is dependent on its ionization
potential. In certain situations when the user is confident that only a single specific compound
exists, they can set up the MicroFID II using a Methane, Hexane, or Propane calibration to
mimic the MicroFID II response as if the MicroFID II was calibrated using that specific single
compound.
The MicroFID II ’s 6 memory slots can be used to store compound information for 6 different
gases. A 7
th
memory slot exists as Memory Slot 1 but it is reserved for TVOC and its default
settings are that of Methane. The TVOC slot appears when this option is selected. The TVOC
memory slot 1 appears with the Compound name as a blank, Response Factor set to 1.0, Alarm
Level set to 1000.0, and a Formula Weight of 16.0.
The MicroFID II ’s other 6 memory slots can be used to store compound information for 6
different gases. By using the Up and Down arrow soft keys, the current values for these
compounds can be viewed one at a time. When the desired compound appears on the screen,
the select soft key can be used to choose that compound and its associated parameters
(Response Factor, Alarm Level, Formula Weight) as the active compound in which all
measurements are performed. See Figure 30.
Figure 30. Setting the Compound Memory
Select Calibration Gas
There are three Gas types of which any one can be used to perform a MicroFID II calibration.
On selecting ‘Select Cal Gas’, the three calibration type gases will appear as a list. They are
Methane, Propane, and Hexane. Using either the Up or Down arrow soft key, highlight the
desired calibration gas and use the SELECT soft key to set the gas.
Compound:
Resp Factor: 1.0
Alarm Level: 1000.0
Formula Wgt: 16.0
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