6141.22X Incubator 8000 IC/SC/NC
Function Description
09.99 Page 49 of 49
polarized positive, while the lead anode is negative. Since the lead anode is converted it has
a limited lifetime. The internal resistance is determined by the electrode surface, the oxygen
diffusion rate and the distances. It is also dependent on the sensor lifetime. In normal
condition it is 700 Ohm. Like most of the chemical processes this one is also dependent on the
temperature. Because of this temperature-independent resistors are connected in parallel to
the sensor which correct the measuring-circuit voltage in conjunction with the internal
resistance.
3.4.3.3 Humidity sensor
In the environmental sensor housing a capacitive humidity sensor with the evaluation
electronics is installed. The output voltage is:
Voltage humidity = (7.1 V / 100 %) x rel. Humidity (%) + 1.05 V
3.4.3.4 Microswitches
The position of the climate sensor housing is evaluated via two microswitches in four positions:
1 sensor housing swivelled in
2 sensor housing partly swivelled in
3 sensor housing hinged
4 sensor housing removed from the hinge
3.5 Skin temperature sensor
The skin temperature sensor is a NTC.
In addition to the recognition "sensor plugged in" a short-circuiting link is installed in the plug
(not used with software version 11.n and 21.n).
T (°C) R (Ohm)
33.0 1588.3
36.0 1411.3
38.0 1293.3
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