GE Centiva/5 Plus, Technical Reference Manual

Page: 64 / 214

4 Test and calibration
TRM, Centiva/5 Plus, M1047448/CM-922026, rev. 3.50.a of 11/05
4-30
RATED ACTUAL
92 mbar
500 Digit
20 l/min
250 Digit
75,2 mbar
510 Digit
530 Digit
251 Digit
Pat.Pressure
Exp.flow
AIR flow ON
O2 flow ON
4.7.7 Overpressure
relief valve calibration
The overpressure relief valve calibration is performed with the use of the service
mode.
To calibrate the overpressure relief valve:
1. Ensure that the system is turned OFF and line power is disconnected.
2. Open main engine according to section 7.2.4.
3. Re-insert exp. valve assembly.
4. Connect line power and gas supply and turn ON the system.
5. Verify that the system performs the power-up test.
6. Start the service mode according to section 4.3.
7. Connect one tube to the
inspiratory port.
8. Seal the open end of the tube
with a 22 mm stopper plug
(e.g. P/N 2900-0001-000).
9. Select the “Air” and “x 1” button.
10. Use the ComWheel to increase the AIR flow to read 20 L/Min. Note: Increase
flow slowly by small steps to avoid oscillation of the over pressure relief
valve.
11. Watch the “Pat.Pressure” increase and stabilize at a certain pressure level.
12. Check the “Pat.pressure” “Actual” to be at 75
±
2 mbar.
13. If not, readjust the overpressure relief valve by turning the valve cap until
“Pat.pressure” “Actual“ reads 75
±
2 mbar.
Turning clockwise increases pressure, counterclockwise lowers pressure.