Pt100 Details

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Pt100 Details

A Pt100 sensor changes its electrical resistance with every change in temperature in its environment. Its resistance value is 100 Ohms at 0°C. This characteristic is used in a bridge circuit to generate a signal suitable for further processing.

There are five quality classes with the following tolerances at 0°C defined by the IEC 60751:2008.

Class B: ±0,3 K

Class A: ±0,15 K

Class B 1/3: ±0,1 K

Class B 1/5: ±0,06 K

Class B 1/10: ±0,03 K

The table below illustrates the tolerances for each Pt100 sensor class at different temperatures.

Pt100 temperature sensors

The New Standard:

The manufacturing tolerances were formerly sub-divided into the accuracy Classes A and B (see above). The new standard contains the additional classes AA and C. Within the validity range of every class for wire-wound resistors and film resistors, the limit deviations (tl) are given in dependence on the temperature (t) in Celsius:

Class AA: tg = 0,1 K + 0,0017 · t

Class A: tg = 0,15 K + 0,002 · t

Class B: tg = 0,30 K + 0,005 · t

Class C: tg = 0,6 K + 0,01 · t

Example for Class B: At 200°C deviations in the measured value of up to ± 1.3 K are allowed.