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

Page: 282 / 494

Datex-Ohmeda ADU
B-56
Document No. 8502854
1. Push the
Setup
key. Select Service and enter calibration password. Select Calibration - Flow
controls - N
2
O & Air . Connect the Test Device to the fresh gas outlet with a tube (Test Device set
to Air low flow range). Zero the Test Device before connecting the tube.
2. Start calibration by selecting Start CAL.
3. Adjust air flow (read on the ADU display) to the first calibration point (1.0 l/min.). Let value
stabilize.
4. Give reference flow (read on Test Device) by selecting Give Flow and turning
ComWheel
. Push
ComWheel
when the given air flow corresponds to the flow in Test Device.
5. Repeat steps (4) and (5) for three more calibration points at 3.0, 7.0 and 11.0 l/min. (for 7.0
and 11.0 l/min. select air high flow range on Test Device and connect a larger tube). Acceptable
reference values are within ± 15% of the requested calibration points.
6. When the status ‘Calibration OK’ is displayed, you can save the calibration by selecting Save
CAL or abort the calibration by selecting Abort CAL . If the status is ‘Calibration Failed’, abort
the calibration by selecting Abort Cal .
7. Close Air flow control and turn N
2
O/Air Selector in position N
2
O.
8. Setup Test Device to N
2
O flow range measurement, with the Test Device set for appropriate low
or high flow measuring range and repeat steps 4 to 7 with N
2
O.
NOTE: Maximum N
2
O flow 11 l/min. may not be attained even with the N
2
O flow control fully open.
This is not a fault proceed with the calibration as long you can attain 9.5l/min. If below 9.5l/min.
check first the pipeline inlet pressures is in specifications and secondly adjust the N
2
O regulator as
step A-C below.
A)
Remove the rear plastic cover (8 Allen screws), fold down the gas inlet part on the A-WGU (2
Allen screws) and open the rear cover of the fresh gas control unit (9 Pozidriv screws).
B) Adjust the screw on the top of the N
2
O pressure regulator until the flow indicates 10l/min. on
the test device.
C) Refit covers in reversed order after adjustment.
Figure 55 A-FGC1 Pressure regulators
9. Select Previous menu . Perform the needed calibrations according to the Calibration Tree.
N
2
O Air O
2