CO
2
Monitoring
17-11
ZERO CAL
This option allows you to zero the CO
2
module, so as to
eliminate the adverse affect of the baseline drift in the
process of measurement. Perform zeroing prior to
concentration calibration.
CONFIRM CAL
This option allows you to confirm the calibration of the CO
2
module.
Calibration Procedure
1. Verify the module enters the ready-to-measure status.
2. Connect a gas bottle with the CO
2
sensor connector on the monitor as shown
below.
Figure 17-6 Connections for Calibration
3. Fill the gas bottle with a standard gas of certain CO
2
content (3%, 4%, 5%, 6%
and 7%), and input the gas to the monitor.
4. Open the CO2 USER MAINTAIN menu, and set the CO
2
field to a value,
which is the same with the CO
2
content of the gas bottle.
5. When the CO2 USER MAINTAIN menu displays the currently measured CO
2
content, wait until a stable reading is indicated, and then select the CONFIRM
CAL option to start calibrating the CO
2
module.
6. If the calibration succeeds, “CALIBRATE SUCCESS!” will be displayed in the
CO2 USER MAINTAIN menu. If fails, “CAL FAIL, TRY AGAIN!” will be
displayed, and re-calibration is required.
7. Select the EXIT option to exit the CO2 USER MAINTAIN menu.
Monitor
Gas bottle
T-shape connector
opening to the
atmosphere
Decompression
valve
Tube
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