Bacharach Parasense GRM2 CO2 Series, Operation & Maintenance Manual

Page: 53 / 97

7-17
Operation & Maintenance Manual
Doc. Ref. MNGRM2CO2 REV. 3
Sensor 4mA Calibration
1. On the GRM2 CO2 display/keypad, navigate to the System Test screen. This will halt the
sampling activity on the system for a few minutes.
NOTE: This is not required, but the sampling activity of the system may prove distracting whilst
performing the subsequent steps.
2. Connect a CC01 programming/debug lead to the CC01 programming/debug port on the GRM2
CO2 network module PCB.
3. Open a terminal program and connect to the CC01 using 9600 baud, 8 data bits, 1 stop bit, No
parity, No flow control.
4. In the terminal program:
4.1.
Enter the ‘ver’ command to confirm successful communication has been established.
5. On the Sensor PCB:
5.1. Press the A button to open the menu system.
5.2. Using the C and D buttons select menu option: E:4 on the sensor PCB screen.
5.3. Press B .
6. In the terminal program:
6.1.
Enter the ‘adc’ command a few times and note the ADC 12 0: value reported
(highlighted below in yellow).
Channel Bits mVolts Value.
--------------------------------------
Pressure
187 456 1111
Detector 2 4
Source 5 12
ADC 3: 786 1918
DAC offset 518 1264
Amb. Temp. 210 512 307
ADC12 0: 400
ADC12 1: 2
ADC12 2: 1
7. On the Sensor PCB:
7.1. Use the C and D buttons to adjust the 4mA output.
8.
Repeat steps 6 & 7 until the ‘adc’ command output reads 400 +/- 1.
9. On the Sensor PCB:
9.1. Press B .
NOTE: Pressing the A button rather than the B button exits without performing the
calibration.
9.2. Press the A button to close the menu system.
NOTE: The Sensor 4mA calibration value will be displayed on exit.
Sensor 20mA Calibration
1. On the GRM2 CO2 display/keypad, navigate to the System Test screen. This will halt the
sampling activity on the system for a few minutes.
NOTE: This is not required, but the sampling activity of the system may prove distracting whilst
performing the subsequent steps.
2. Connect a CC01 programming/debug lead to the CC01 programming/debug port on the GRM2
CO2 network module PCB.
3. Open a terminal program and connect to the CC01 using 9600 baud, 8 data bits, 1 stop bit, No
parity, No flow control.