User Manual V1.1a | XtracontrolEC22
Temperature measurement AI (T)
Abb. 12: example connection: temperature measurement
Item
Description
1
PT 100 with 2-wire connection
2
PT 100 with 3-wire connection
▶
Only use the corresponding AGND for each power input.
▶
Do not connect AGNDs from different channels.
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Only use one channel per function: either AI (U) or AI (I).
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Do not connect to the common GND. The required connections can already be found on the circuit board.
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Cables to the PT100(0) sensors should be connected as directly as possible (avoid the use of terminals and
terminal blocks).
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Only connect PT100(0) sensors to AI (U/T) channels. Each 14-pin plug-in connector has 2 AI (U/T) channels.
2-wire measurement
Resistance can result in a measurement error, which in the case of long cables with a small cross-section can be up
to 10°. If the temperature of the sensor is known, this deviation can be subtracted and this way compensated
through the software (alternatively, use 3-wire measurement).
3-wire measurement
The nearest AI (U) connection is used to compensate the resistance in the cable. It can only be used directly in
conjunction with the following AI (U/T) channel.
© Infranor GmbH
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