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4 Test and calibration
4.7.6 Airway pressure
sensor calibration
4-28
The Airway pressure sensor calibration is divided into two parts
The offset calibration
•
The gain calibration
•
The Offset calibration is performed with the use of the service mode only. The gain
calibration is performed by using an external pressure measurement device. To
calibrate the airway pressure sensor:
1. Ensure that the system is turned OFF and line power is disconnected
2. Open main engine according to section 7.2.4:
3. Remove internal back-up battery according to section 7.9.1:
4. Re-insert exp. valve assembly:
5. Connect line power and gas supply and turn ON the system:
6. Verify that the system performs the power-up test:
7. Start the service mode according to section 4.3.:
8. Connect the standard breathing system to the inspiratory and expiratory port.
Connect a standard 15 male/female y-piece elbow with a LUER lock gas
sample port to the y-piece:
9. Seal the open end of the y-piece elbow using the seal port on the exp. valve
assembly:
10. Connect the external pressure measurement device to the LUER lock
connection of the Y-piece elbow:
11. Turn on the pressure measurement device and let it warm up according to
manufacturers instructions:
12. Select the "PRESS" button and verify no flow is
activated:
13. Verify the pressure to be 0 mbar on the ext.
pressure meter.
14. Check the "Pat.Pressure" "Actual" to be at 0 ±
0.5 mbar:
15. If not, readjust the "Zero" for the Airway
pressure sensor with
R 326 on the main board to read 0 ± 0.1
mbar.
TRM, Centiva/5 Plus, M1047448/CM-922026, rev. 3.50.a of 11/05
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