Maintenance
25-4
25.6 Calibrating CO
2
For sidestream and microstream CO
2
modules, a calibration is needed every year or when the
measured values have a great deviation. For maintream CO
2
module, no calibration is
needed.
Tools required:
Gas bottle, with 3%, 4%, 5%, 6% or 7% of CO
2
.
T-shape connector
Tubing
Follow this procedure to perform a calibration:
1. Make sure that the CO
2
module has been warmed up or started up.
2. Select [Main Menu]→[Maintenance >>]→[User Maintenance >>]→enter the
required password→[Maintain CO2 >>].
3. In the [Maintain CO2] menu, select [Zero].
4. Connect the gas bottle with the tubing using a T-shape connector as shown below.
Check the airway and make sure there are no leaks.
5. Vent the tubing to the CO
2
opening the gas valve.
6. In the [Calibrate CO2] menu, enter the vented CO
2
concentration in the [CO2] field.
7. In the [Maintain CO2] menu, the measured CO
2
concentration, barometric pressure,
sensor temperature and current flowrate are displayed. After the measured CO
2
concentration becomes stable, select [Calibrate CO2] to calibrate the CO
2
module.
8. If the calibration is finished successfully, the message [Calibration Completed!] is
displayed. If the calibration failed, the message [Calibration Failed!] is displayed.
Perform another calibration.
9. Select
to exit the current menu.
Monitor
Gas bottle
Open to the air
Gas valve
Tubing
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