Pt100 - Sensors

Accuracy of Pt100 - temperature sensors

The accuracy of Pt100 temperature sensors is specified in DIN IEC 751 in so-called classes.
The accuracy class for the Pt100 sensor is determined by the manufacturer.

Download table of permissible measuring errors according to IEC 751

Calculation formulas for accuracy of Pt100 sensors

The measurement deviation can be calculated using the following formulas.

• Class A:
  Calculation formula: t_F= ± (0,15 + 0,002 x t)
  valid for temperatures from -200...+650 °C in 3- or 4-wire connection
• Class B:
  Calculation formula: t_F= ± (0,30 + 0,005 x t)
  alid for temperatures from -200...+850 °C
  
  t= Measured temperature without sign (+ or -)
  t_F= Measuring error in °C

Example:

	Class A	Class B			Class A	Class B
-200 °C	0,55 °C	1,30 °C		+400 °C	0,95 °C	2,30 °C
-100 °C	0,35 °C	0,80 °C		+500 °C	1,15 °C	2,80 °C
0 °C	0,15 °C	0,30 °C		+600 °C	1,35 °C	3,30 °C
+100 °C	0,35 °C	0,80 °C		+700 °C	---	3,80 °C
+200 °C	0,55 °C	1,30 °C		+800 °C	---	4,30 °C
+300 °C	0,75 °C	1,80 °C

Some manufacturers of Pt100 sensor elements, have extended these tolerance ranges according to the requirements of the market.
For example:

• 1/3 DIN B
  Berechnungformel: t_F= ± (0,1+0,005 x t)
oder
• 3-fach DIN B
  Berechnungsformel: t_F= ± (0,9+0,005 x t)
  
  t= gemessene Temperatur ohne Vorzeichen
  t_F= Messfehler in °C