ecom-EN3
Page 63
11.2 Gas sensors
The sensors get calibrated with the reference gas fresh air by each switch-on.
New sensors age along the operation time because of the wearing of the reagents (oxygen
sensor) and due to soiling respectively exceeding concentrations beyond the nominal
measurement range (toxic sensors).
Their state of the sensors is permanently checked by the instrument.
The output values of the sensors are listed in the menu "Control". The reference values of
the sensors are:
Sensor Reference value output voltage
O2 12000 mV
Others 0 mV (+/- 150 mV)
Hint
If an error message occurs during the calibration phase, a further calibration
phase can help to calibrate all installed sensors sufficiently.
If after several repetitions of the calibration phase an error message
occurs during the calibration phase, the instrument has to be checked.
Hint
The O
2
sensor must display a value > 7000 mV.
If an output voltage <7000 mV is displayed in the "Control" menu
after the calibration phase, the O
2
sensor must be replaced.
Hint
The CO sensor is protected against overload by the internal programme.
For further information on CO overload protection, please refer to
the chapter "CO-Overload Protection"
11.3 Probe and tubing
Depending on the frequency of use, probe and tubing should be regularly cleaned in order to
release particle deposits and to prevent early wearing due to corrosion.
The hose can be cleaned (flow warm water in then dry respectively blow water drops out)
after loosening all plug-in connections on the instrument and on the probe.
O-rings of the hose connections should occasionally be greased with acid-free grease.
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