Bacharach Parasense GRM2 CO2 Series, Operation & Maintenance Manual

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7-15
Operation & Maintenance Manual
Doc. Ref. MNGRM2CO2 REV. 3
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
bag.
6. Open the GRM2 CO2 door, on the sensor PCB:
6.1. Press the A button to open the menu system.
6.2. Use the C and D buttons to select menu option: E:1 on the sensor PCB screen.
6.3. Press B .
7. Open the valve on the sample bag.
8. On the GRM2 CO2 display/keypad, press the key to begin the System Test sample. The
sample process is complete when the measured concentration is reported.
9. Wait for the sample process to complete.
10. Press the key again to begin the System Test sample for a second time.
11. Wait for the sample process to complete.
12. On the sensor PCB:
12.1. Press B
to zero the sensor; ‘- - - -’ will be displayed to confirm the sensor zero
calibration has been performed.
NOTE: Pressing A rather than B exits without performing sensor zero calibration.
12.2. Press A to close the menu system.
NOTE: The sensor zero calibration value will be displayed on exit while the A key is
pressed.
13. Close the valve on the sample bag and disconnect the bag from the system.
14. The Sensor Span Calibration will now need to be followed.
Sensor Span Calibration
1.
Ensure the “
CO2 10,000PPM
” sample bag is completely empty.
2.
Fill (to 75% full) the “
CO2 10,000PPM
” sample bag with “
CO2 10,000PPM
” 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, since (due to installation restrictions) it may be easier to access
freeway connections on certain channels.
5. Connect the sample bag to the channel selected for System Test.
6. On the sensor PCB:
6.1. Press the A button to open the menu system.
6.2. Use the C and D buttons to select menu option: E:2 on the sensor PCB screen.
6.3. Press B .
7. Open the valve on the sample bag.