Table of Contents
4 Test and calibration
4.7.3 AIR flow
calibration
Offset calibration
4-20
The AIR flow 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 flow measurement device.
To calibrate the AIR flow sensor follow this preparation sequence:
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. Use a 10" 22 mm tube to
connect the external flow
measurement device to the
inspiratory connection.
9. Verify that the direction of flow is correct for the measurement device.
10. Turn on the flow measurement device and let it warm up according to
manufacturers instructions
11. Select AIR for the measured gas on the
flow measurement device.
12. Select the "AIR" and "x 1" button.
13. Verify the flow to be 0 L/Min on the
external flow measurement device.
14. Check the "AIR flow" "Actual" to be at
the "Rated" value ± 50 digits.
15. If not, readjust the "Zero" for the AIR
flow sensor with R 316 on the main
board B to read "Rated" value ± 10
digits.
Pat.Pressure
Exp.flow
AIR flow ON
O2 flow ON
TRM, Centiva/5 Plus, M1047448/CM-922026, rev. 3.50.a of 11/05
ACTUAL
RATED
0 mbar
0 mbar
513 Digit
500 Digit
254 Digit
250 Digit
251 Digit
250 Digit
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