3-8 BeneVision N22/BeneVision N19 Patient Monitor Service Manual
6. Open the relief valve, and adjust it until the flowmeter has a stable reading between
10 ml/min and 50 ml/min.
7. In the Calibrate CO2 menu, enter 6% (the CO
2
concentration) in the CO2 field. The measured CO
2
concentration is
displayed.
8. After the measured CO
2
concentration becomes stable, select Calibrate CO2 to calibrate the CO
2
module.
9. Replace the cylinder to the steel gas cylinder with >40% O2 and balance gas N2(applicable to sidestream CO2
module with O2 module equipped) and calibrate O2.
If the calibration is finished successfully, the message Calibration Completed! is displayed in the Calibrate CO2 menu. If
the calibration failed, the message Calibration Failed! is displayed. In this case, check whether the operations are
correct and perform another calibration. If the calibration fails several times, return the module to Mindray for repair.
3.2.4 AG Tests
Leakage Test
1. Plug the AG module into the module rack.
2. Wait until the AG module warmup is finished and then completely block the gas inlet of the AG module (you may
use a pneumatic plug or your finger to manually occlude the port). An alarm message AG Airway Occluded will
appear on the screen.
3. Block the gas inlet for another 60 seconds. Select Main Menu → Maintenance → enter the required password
→ Module → AG → Calibration. Check that the flow rate is less than 10 ml/min. If the alarm message
continues, it indicates that the module does not leak.
If the alarm message disappears, or the flow rate is greater than or equal to 10 ml/min, it indicates that the module
leaks.
Accuracy Test
Tools required:
Gas cylinder with a certain standard gas (such as 6±0.05% CO2, Bal N
2
) or standard gas mixture. Gas
concentration should meet the following requirements: AA > 1.5%, CO
2
> 1.5%, N
2
O > 40%, O
2
> 40%, of which
Monitor
T-shape connector
Tubing
Relief valve
Flowmeter
Gas cylinder
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