Measuring type: CoE 0x80n00:19 "RTD element"
When measuring temperature via RTD sensors, the measuring device (here: the EL32xx terminal) measures the sensor resistance electrically and transforms it into a temperature in the firmware. As an example, the relationship between the temperature and the resistance of a Pt100 and Pt1000 sensor is shown below:
Temperature | Pt1000 typical resistance, approx. | Pt100 typical resistance, approx. |
|---|---|---|
850°C | 3.9 kΩ | 390 Ω |
320°C | 2.2 kΩ | 220 Ω |
-200°C | 180 Ω | 18 Ω |
Further characteristic sensor curves are available from the sensor manufacturers. Extensive background information is provided by chapter "Basics of RTD technology" of the IO Analog Manual.
CoE 0x80n00:19 "RTD element"
A large number of different R -> T transformations can be selected in the firmware (see also chapter "Overview of implemented RTD transformations" of the IO Analog Manual). The terminal then outputs the converted temperature value:
Alternatively, a direct resistance output can be selected:
