H84.0.15.6C-01
Operating manual ResOx 5695
Page 10 of 22
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6
The oxygen sensor
6.1 General notes about the oxygen sensor
6.1.1 Life time
At the end of the life time, the signal of the sensor is dropping rapidly. The sensor evaluation in % therefore
can only be taken as a relative measure. An evaluation of 70% does not mean that 70% of life time is left, but
that the electrode signal has 70% of an optimal state reference.
The nominal life time may be reduced due to the application. Negative effects are:
Extreme storage and operation temperature.
Humidity of measured gas: If permanently used with dry gases (technical gases, bottled gas) the lifetime
decreases considerably.
The sensor state evaluation will be stored after a successful calibration of the oxygen
sensor.
6.1.2
Mounting /operation position
The optimum position for the sensor membrane is to point downwards.
If sensor is screwd in pressure.tight into an application wichs pressure differs from the
ambient pressure, the maximum differential pressure at the sensor membrane is 250 bar.
Unsuitable for underwater-diving-application e.g. Rebreather.
6.1.3
Measuring precision
The precision can be influenced due to:
Liquids at the sensor inlet. Rinse the inlet and dry with lint-free cloth.
Avoid liquids of any kind at the contacts.
Gas and sensor temperature have to be at same level. Best precision, when calibrated at measuring
temperature.
Pressure fluctuations: The sensor is originally a partial pressure sensor, i.e. changes in the absolute
pressure are influencing the measuring result directly proportional. A pressure change of 1% will cause a
additional measuring error of 1%!
For optimum precision calibrate at the same conditions at which you want to measure.