3-6 BeneVision N22/BeneVision N19 Patient Monitor Service Manual
3.2.3 Sidestream and Microstream CO
2
Tests
Leakage Test
1. Plug the module into the module rack.
2. Wait until CO2 warmup is finished and then completely block the gas inlet of the module or water trap (by using
your finger or a pinched sample line). The sidestream and microstream CO
2 modules will behave as follows:
Sidestream: Plug the sidestream CO
2
module into the module rack of the main unit. Wait one minute until
the module warmup is finished and then completely block the gas inlet of the module (you may use a
pneumatic plug or your finger to manually occlude the port). An alarm message CO2 Airway Occluded will
appear on the screen. Block the gas inlet for another 60 seconds. Select Main Menu → Maintenance →
enter the required password → Module → CO2 → Calibration. If the flow rate is less than 10 ml/min and
the alarm message continues, it indicates that the module does not leak. If the alarm message CO2 Airway
Occluded disappears, or the flow rate is greater than or equal to 10 ml/min, it indicates that the module
leaks.
Microstream: After 3 seconds, the alarm message "CO
2
Purging" is displayed on the screen. Block the gas
inlet for another 30 seconds. If the alarm message "
CO
2
Airway Occluded" is displayed, it indicates that
the module does not leak.
Accuracy Test
Tools required:
For microstream CO
2
module and CO
2
sidestream module without O
2
module, a gas cylinder with 5±0.03% CO2,
21.0% O2 and balance gas N2 (P/N 0075-00-0033-01) o r a ste e l g as cylin d e r w it h :
CO2 concentration 3% - 7%
a / c ≤ 0 .0 1 (w h e r e a = a b s o lu t e g a s c o n c e n t r a t io n a c c u r a c y , c = g a s c o n c e n t r a tio n )
balance gas N2
For sidestream CO
2
module with O
2
module equipped, a steel gas cylinder (0075-00-0048-01) with 6% CO2, 4%
Desflurane, 45% N2O, and 45% O2,
T-shape connector
Tubing
Flowmeter
1. Plug the module into the module rack.
2. Wait until the CO
2
module warmup is finished. Check the airway for leak and perform a leakage test as well to
make sure that the airway has no leak.
3. Select Main Menu → Maintenance → enter the required password → Module → CO2 → Calibration.
4. Connect the test system as follows:
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