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

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Calibration A-EV1
Document No. 8502855
C-37
O
2
and air pressure sensor calibration
This procedure calibrates the wall pressure sensors. These sensors are used to detect if wall
pressures are lost and to switch driving gas if driving gas selected by the user, is lost. The calibration
factors are saved in EEPROM 41 and 42 for air and EEPROM 43 and 44 for O
2
.
Equipment needed: Pressure test device
High pressure Test adapter
Settings: Reserve gas cylinders closed
ADU On
Manual mode
Flows closed
Air/N
2
O selector switch in Air position
1. Disconnect the gas inlet hoses O
2
, N
2
O and air from the A-WGU (gently because of the high
pressure).
2. Enter relevant range on the test device.
3. Zero the test device. The reading on the test device screen should be 0.0.
4. Connect the high pressure test adapter and test device as figures show below.
Figure 28 O
2
and air pressure sensor calibration test setup
5. Push the
Setup
key. Select Service and enter the calibration password. Select Calibrations -
Ventilator - O
2
pressure or Air pressure page depending on which sensor to be calibrated.