![CAI 700M Скачать руководство пользователя страница 40](http://html1.mh-extra.com/html/cai/700m/700m_operators-manual_3331460040.webp)
700M HFID
6-2-15
40
THC/CH
4
/NMHC Mode
→
→
The THC/CH
4
/NMHC
m
ode 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
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