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

29Specific parameters

4.5 Specific parameters

There are a number of other parameters to be set which pertain to the specific (analog) conditioning of

the measurement channels, and thus come with different (and different amounts of) options to select,

depending on the channel group involved. The options are:

Input range: a variety of ranges depending on the channel type

Sensor supply

Filter frequency: low-pass filtering or automatic anti-aliasing filter, corner frequency or options

particular to channel type

Linearization: for thermocouples and PT100 thermistors(for C-41xx and C-70xx)

4.6 Measurement types

4.6.1 Temperature measurement

Temperature measurements can be performed by CS/CL-41xx and CS/CL-70xx

Two methods are available for measuring temperature.

Measurement using a PT100 requires a constant current, e.g. of 250 µA to flow through the sensor. The

temperature-dependent resistance causes a voltage drop which is correlated to a temperature according

to a characteristic curve.

In measurement using thermocouples, the temperature is determined by means of the electrochemical

series of different alloys. The sensor produces a temperature-dependent potential difference from the

terminal in the CAN connector pod. To find the absolute temperature, the temperature of the terminal

point must be known. For the PT1000 this is measured directly in the terminal pod, and therefore an

additional type of connector pod is needed.

The voltage coming from the sensor will be converted into the displayed temperature using the

characteristic curves according temperature table IPTS-68.

Note on making settings with imc software

A temperature measurement is a voltage measurement whose measured values are converted to

physical temperature values by reference to a characteristic curve. The characteristic curve is selected

in the base page of the imc operating software configuration dialog. Amplifiers which enable bridge

measurement (e.g.Cx-70), must first be set to voltage mode (DC), in order for the temperature

characteristic curves to be available on the Base page.

IMC C SERIES User Manual

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