9
３－４．Flow monitor check
When the power gets ON, the pump shall start operation check that suction works properly by
filter tube with flow monitor.
At normal sucking（Can see float）
Not sucking（Can not see float）
３－５．Zero point calibration
Zero point calibration for this instrument shall be done for CH4(Methane), O2(Oxygen),
CO(Carbon monoxide) and that of CO2 carbon dioxide by separating them. When calibrate zero
point of CO2, it is required to remove CO2 in air by CO2 removal filter.
Float
Caution
When make zero adjustment, proceed to do it after having fresh air sucked into instrument
for over 1 min. But it is impossible to make correct zero adjustment if gas containing air
is put through instrument. 300-500ppm CO2 is remaining in air. If CO2 in air is directly
sucked into instrument for zero adjustment of CO2, it is impossible to make zero adjustment.
Through CO2 scrubber to the instrument, have air sucked into the instrument for over 1min.
Then, make zero adjustment.
