700M HFID 6-2-15
40
THC/CH
4
/NMHC Mode
→
→
The THC/CH
4
/NMHC mode activates the “sample and hold” feature which allows the
analyzer to automatically cycle between THC and CH
4
measurement. To change to the
THC/CH
4
/NMHC mode, press from the Measure Mode menu. The current measuring
mode (cycle) is indicated above the analyzer range. Example above: CH
4
.
The cycle times of the sample read are set on the THC/CH
4
/NMHC Mode Times screen. All
THC and CH
4
readings are displayed as averaged values.
The cycle begins with the CH
4
reading. When the CH
4
(through the non-methane cutter) reading
is completed, the analyzer switches to the THC mode. When the THC
cycle is completed, the
analyzer updates the averaged CH
4
and THC values on the screen and the analog outputs. At that
point, the difference between the averaged value of THC and CH
4
is calculated as the NMHC
(Non-Methane Hydrocarbon) concentration. The cycle continues to repeat.
For advanced calibration and operation in THC/CH
4
/NMHC mode, see CH
4
Correction Factors
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