4-10
Calibration
Tools required:
Gas cylinder with a certain standard gas (such as 6±0.05% CO2, Bal N2) or standard gas mixture. Gas concentration
should meet the following requirements: AA [1.5%,7.0%], set step length: 0.1, CO2 [1.5%,7.0%], set step length: 0.1,
N2O [40%,100%], set step length: 5, O2 [40%,100%], set step length: 5, of which AA represents an anesthetic agent.
Precision requirement: a/c ≤ 0.01 (a is the gas absolute concentration accuracy; c is the gas concentration)
T-shape connector
Tubing
Flowmeter
Follow this procedure to perform a calibration:
1. Select Main Menu→Maintenance→enter the required password→Module→AG.
2. Check the airway and make sure that there are no occlusions or leaks.
Vent the sampling tubing to the air and check if the Current Flow Rate and Set Flow Rate are approximately
the same. If the deviation is great, it indicates that there is an occlusion in the tubing. Check the tubing for an
occlusion.
Perform a leakage test to make sure that the airway has no leakage.
3. Connect the test system as follows:
4. Open the relief valve and vent a certain standard gas or gas mixture. Adjust the relief valve until the flowmeter has
a stable reading between 10 ml/min and 50 ml/min.
5. In the Calibrate AG menu, the concentration and flowrate of each measured gas are displayed.
If the difference between the measured gas concentration and the actual one is within tolerance, a calibration
is not needed.
If the difference is not within tolerance, a calibration should be performed. Select Calibrate.
6. Enter the vented gas concentration. If you use only one gas for calibration, set other gases' concentration to 0. If the
calibration is performed for all gases, the gas with an entered calibration value of 0 is not calibrated.
7. Select Calibrate to start a calibration.
Monitor
Gas cylinder
Flowmeter
Relief valve
Tubing
T shape connector
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