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ITI Direct

Pt100 Accuracy and Tolerance

IEC 60751:2008 is considered the international standard and specifies the tolerances for platinum RTD elements.

The two most common tolerances for Pt100 RTD sensors are class A and Class B, for closer tolerance 1/3 DIN and 1/10 DIN standards are available.

The higher the element tolerance the broader it’s range to deviate away from the temperature-resistance curve increasing the level of uncertaint.

Table below shows the tolerance for class A and class B detectors as defined by DIN 43760, these standards are then used to find the tolerance of 1/3 DIN and 1/10 DIN detectors.