IMC CANSAS - Temperature Measurement; IMC Thermoplug (Type: Standard DSUB)

C8 voltage, temperature, current 269
imc CANSAS Users Manual - Doc. Version 1.9 - 05.12.2014© 2014 imc Meßsysteme GmbH
6.4.3 Temperature measurement
The C8-module's channels are designed for measurement with thermocouples and Pt100-sensors (RTD,
platinum resistance thermometer as per DIN and IEC 751). Any combination of sensor types can be
connected. All common thermocouple types with their characteristic curves are supported. However, it is
only possible to measure with multiple thermocouples at the same time if they are all of the same type.
Thus, two Type K channels will work, but not 1 channel Type K and one channel Type B won't. A
combination of thermocouple measurement and Pt100 measurement, by contrast, is possible.
6.4.3.1 imc thermoplug (type: Standard DSUB)
The terminal point compensation for the thermocouple measurements is either built-in or is handled by
the imc-Thermoplug, depending on the device variety.
The patented imc-Thermoplug(ACC/DSUB-T4), which is a pod containing a DSUB-15 screw terminal and a
built-in temperature sensor (Pt1000), provides cold junction compensation. This enables any type of
thermocouple to be directly connected to the differential inputs (+IN and -IN) without the need for a
compensation line:
A sensor measures the temperature at the connection terminal and correspondingly compensates the
thermoelectric voltage. Normally, a special compensation line or plug made of the same material as the
particular thermocouple type must be used to connect the terminal to the cold junction (reference point)
in the device interior, in order to prevent the formation of additional (uncontrolled) parasitic
thermocouples.
The imc system avoids this problem by means of individual compensation sensors directly inside the
connector pod and thus provides a convenient, flexible and affordable interconnections solution.