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USER HANDBOOK 1.2 | B-PRIMIS DC/ET PRIME 2110W X C, 2115WUX C
Berghof Automation GmbH | Harretstraße 1 | 72800 Eningen |
www.berghof-automation.com
270011X00_B-PRIMIS_ET-DC-PRIME 2110W-2115W_EN.docx
42
Temperature measurement AI (T)
Fig. 24: 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 input.
Do not connect AGNDs from different channels.
Do not connect to the common GND. The required connections can already be found on the cir-
cuit board.
Cables to the PT100(0) sensors should be connected as directly as possible (avoid the use of
terminals and terminal blocks).
Only connect PT100(0) sensors to 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 by
the software automatically and compensated (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. Channels 1 and 2, and also channels 3 and 4
each form a pair for 3-wire measurement.