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Page 48
Temperature measurement
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8.
Temperature measurement
As described earlier, there are two ways of measuring the oil temperature:
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The temperature signal is supplied by a temperature transducer as a 4...20 mA signal.
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The temperature signal is supplied by a PT-100 sensor in a three-wire circuit.
8.1
Accuracy considerations
From a measurement standpoint, the accuracy of the hot-spot temperature recording is es-
sentially influenced by the oil temperature measurement.
Calculating the hot-spot temperature from the measured oil temperature does not intro-
duce any additional errors.
The measuring chain:
Error determination:
Assuming that the error in the resistance thermometer PT100 in temperature range 20 to
140°C does not exceed 0.1%, the average total error is achieved when using the proposed
temperature transducer:
The average error is:
The maximum error is, however:
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