Datex-Ohmeda Aestiva 7900 SmartVent, Technical Reference Manual

Page: 105 / 204

4b Tests and Calibration 1.X/3.X Software
1006-0453-000 05/04 4b-23
4b.9 Calibrations
4b.9.1 Calibrate O
2
Sensor
The software calibrates the O
2
sensor at a selected altitude, see “Select
Altitude” menu. Set the appropriate altitude for the machine location. The
software in the ventilator calibrates the O
2
sensor by reading the A/D for the
O
2
sensor when the v sensor is exposed to room air (21% O
2
). If this A/D value
is not within the tolerance the calibration fails. If the calibration passes, the
A/D value at which the O
2
sensor was calibrated is stored in the EEPROM.
Note: a circle module is required for all calibrations.
The sensor must be calibrated at 21% O
2
before calibration at 100% O
2
.
Remarks
Remove the O
2
sensor from the breathing circuit module and expose it to
room air for approximately 3 minutes. The displayed reading should be
21%
± 2% to pass the calibration requirements. Place the sensor that passed
the 21% test in the breathing system and expose it to 100% O
2
for 3 minutes.
If the sensor passes, the A/D value at which it passed is stored in the
EEPROM. If it displays readings higher or lower than required to pass, replace
the sensor.