4 | Operation G 1690 / G 1690T
12 / 20 B-H86.0.31.DK2-1.0
4.2 Adjustment to the sensor signal
For safe measurements, the function of the sensor and device must be checked
regularly:
- Regular calibration on ambient air (20.9 vol. % O
2
) in accordance with the instruc-
tions
- In the case of higher oxygen values, check the function with a known gas concentra-
tion, preferably in the area of the gas to be measured (e.g. pure oxygen, NITROX50
or similar, "bump test")
_
Before calibration, the current air pressure must always be entered in the device menu.
The entry is made in the PAbS parameter and is entered in hPa without decimal place.
The device displays a sensor evaluation after calibration.
This can give conclusions about the durability of the sensor.
If the evaluation is below 30 %, for example, the sensor should be replaced.
Carrying out the calibration:
1. Press the Function button for approx. 5 seconds until CAL appears in the display
to call up the Sensor Calibration.
2. Release the button, CAL Air appears and after completion for approx. 5 seconds
the sensor evaluation in 10% steps.
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