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imc C-SERIES - Manual, Version 4 R 3 - 2018-10-19

31Measurement types

4.6.1.3 imc Thermo connector

The imc Thermo connector ACC/DSUB-T4 contains a screw terminal block in a DSUB-15 connector

housing with a built-in temperature sensor (Pt1000) for cold junction compensation. This provides for

direct connection of thermocouples of any type, directly to the differential inputs (+IN and -IN) without

external compensation leads. That connector can also be used for voltage measurement.

The difficulty with thermocouple measurements are the "parasitic" thermocouples which inevitably form

where parts of the contacts made of different materials meet. The temperature sensor measures the

temperature at the connection terminal and compensates the corresponding "error"-voltage. Normally,

the connection to this compensation point (inside the device) is made by special compensation leads or

connectors made of material identical to the respective thermocouple type, in order not to create

additional (uncontrolled) parasitic thermocouples.

imc's system avoids the problem through the use of individual compensation sensors directly inside the

connector plug, thus offering an especially simple, flexible and cost-effective connection solution.

Reference

Please find here the pin configuration: ACC/DSUB-T4

171

IMC C SERIES User Manual

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