Resistance Sensors; Definition; Characteristic Curves - Siemens 3RS2 Manual

Resistance sensors

9.1

Definition

A resistance sensor is an electrical component which uses the temperature dependency of the
electrical resistance of a conductor to measure temperature.
Different types of resistance sensors are available: PTC (positive temperature coefficient) and
NTC (negative temperature coefficient).
PTC thermistors (e.g. Pt100/Pt1000 or KTY83/KTY84) are most commonly used in industrial
temperature measurement applications.
The characteristic curve of KTY type resistance sensors is considerably less linear than that of Pt
sensors. However, it exhibits a change in resistance in the event of temperature fluctuations that
is approximately twice as high. KTY type resistance sensors are, therefore, highly sensitive but
have a relatively small temperature measuring range.
9.2

Characteristic curves

The following characteristic curves show the temperature ranges of resistance sensors:
Figure 9-1
3RS2 temperature monitoring relay
Equipment Manual, 02/2022, A5E42462552002A/RS-AB/002
Temperature ranges of the resistance sensors
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