Bacharach Parasense GRM2 CO2 Series, Operation & Maintenance Manual

Page: 55 / 97

7-19
Operation & Maintenance Manual
Doc. Ref. MNGRM2CO2 REV. 3
FIELD CALIBRATION (CO2 CLAIRAIR SENSOR)
NOTE:

You need to hold the sensor PCB buttons for at least 2 seconds for them to respond.
Sensor PCB
The Parasense CO2 calibration kit includes:

1 x
10 litre cylinder of 100% Nitrogen test gas, labelled “
CO2 ZERO
”.

1 x 3 litre sample bag, labelled “
CO2 ZERO
”.

1 x 10 litre cylinder of 10,000ppm CO2 test gas, labelled “
CO2 10,000PPM
”.

1 x 3 litre sample bag, labelled “
CO2 10,000PPM
”.
NOTE:
The actual co
ncentration of the gas in the cylinder labelled “
CO2 10,000PPM
” is printed on
the label attached to the cylinder and can vary slightly from the ideal 10,000PPM. This is
acceptable and the variation is noted as part of the procedure.
Sensor Zero Calibration .
1.
Ensure the “
CO2 ZERO
” sample bag is completely empty.
2.
Fill (to 75% full) the “
CO2 ZERO
” sample bag with “
CO2 ZERO
” test gas.
3.
On the GRM2 CO2 display/keypad, navigate to the System Test screen.
4.
Use the Up/Down keys to select a channel on which to perform the System Test.
NOTE: The calibration process applies to all channels. The ability to choose a channel is
provided here for convenience (due to installation restrictions, it may be easier to access
freeway connections on certain channels).
5.
Disconnect the freeway from the channel selected for System Test and connect the sample.
6.
Open the GRM2 CO2 door, on the sensor PCB:
6.1 Press the A button to show
“Cal mode”
6.2 Press the B button ( Y on the display) to show
“Set Zero”.
6.3 Press the B button again ( Y on the display) to select
“Zero Cal” mode.
7.
Open the valve on the sample bag.
8.
On the GRM2 CO2 display/keypad, press the key to begin the System test sample and
allow the channel to purge and sample. Do this twice to ensure the Nitrogen has fully displaced