Datex-Ohmeda Anesthesia Delivery Unit S/5, Technical Reference Manual

Page: 92 / 494

Datex-Ohmeda ADU
5-34
Document No. 8502852
9. Select Previous menu - Fresh gas control and perform step 7 and 8 but for N
2
O.
NOTE: If any of the pressure sensors are out of tolerance, they need to be recalibrated. For O
2
and air
pressure sensors, please refer to “Part II” section “Electronic Ventilator - Calibration” in this manual.
For the N
2
O sensor, refer to “Part II” section “Fresh Gas Control Unit - Calibration” .
NOTE: If any of the pressure gauges are out of tolerance, the need to be replaced.
Figure 40 The A-FGC1 and the A-EV1 diagnostic pages
10. Disconnect the test adapter gas inlet from the pipeline supplies gas (Air).
11. Wait one minute for the pressure in the system to stabilize.
NOTE: Make sure that the gas inlet assembly block on the A-WGU is in upward position when
performing the test of the non-return valves.
12. Check that the pressure drop on the test device does not exceed the following value during a
period of 2 minutes: < 0.07 x 100 kPa. (1 psi).
NOTE: If the check fails, check each gas line individually to find out which gas line is leaking and then
correct the failure. The total sum of pressure drop when testing the gaslines separately should not
exceed 0.2 x 100 kPa (3 psi) during a period of 2 minutes, which is equal to a pressure drop of 1 psi
when all three gas lines are tested at the same time.
13. Disconnect the high pressure test adapter.
14. Note the N
2
O pressure sensor value on the diagnostic page.
15. Check that pressure drop on N
2
O pressure sensor does not exceed the following value during a
2-minute period: < 0.2 x 100 kPa.
NOTE: If pressure drops more is this an indication of a leaking non-return valve in the WGU.
16. Select the previous menu and select Ventilator diagnostic page, and repeat steps 14 and 15 as
above but for O
2
and Air.
17. Connect the gas hoses O
2
, N
2
O and Air to their respective inlet connections on the WGU.