The most commonly used is the Pt 100 Ohm probe
The resistance probe offers a measurement of great accuracy and very good long-term stability.
A Pt 100 Ohm probe corresponds to a platinum resistance whose initial value is 100 Ohms for a temperature of 0°C.
The measuring element consists of wound platinum wires whose resistance varies according to the temperature. The resistance / temperature correspondence is documented in the IEC 60751 standard.
The temperature probe is often delivered with a connection head (see photo opposite).
|Measuring scale||From -200 ° C to + 600 ° C|
|Protection tube||Stainless steel|
|Diameter of the immersion||Up to 8 mm|
|Useful length of the immersion||Up to 1000 mm|
|Connection||Standard single element 3 or 4 wires or double element on request|
|IP protection rating||Up to IP68|
|Electric approval||ATEX explosion-proof or intrinsically safe on request|
|Accuracy||Class A according to CEI 751 / NF EN 60751|
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The choice of probe type depends on your application. A resistance probe is more accurate than the thermocouple and has a very good measurement stability. Moreover, it enjoys excellent repeatability of the measurement. See here our comparison chart.