Characteristic line for Pt 100 resistor of tolerance-classes

Deviation in °C for Pt 100 sensors of the classes B; A; AA


 

 

Temperature range of validity of limit deviation

The lower bound of temperature for the limit deviation its about the available verify requirement limited of –196 °C (-195,80°C are the boiling point from the nitrogen, a usual temperature for calibrate). The upper limit of temperature are fixed of +661 °C , (660,323 °C are solidification point from aluminium, a usual temperature for calibrate). The reasons are, that the analysis found on industry resistors a lot of significant deviants of temperature over 650 °C. That’s why in these temperature range the limit deviation for the thermometer or resistors between the producer and user should be specified.

 

Accuracy-class (formulas) of IEC 751 - NEW
The values of limit deviation for resistance thermometers are in the following table:

Class
Limit deviation (ºC)
Range (ºC)
AA (new)
± (  0,1 + 0,0017 [t] ) ¹)
- 50 up to + 250
A
± ( 0,15 + 0,0020 [t] ) ¹)
- 100 up to + 450
B
± (  0,3 + 0,0050 [t] ) ¹)
- 196 up to + 600
C (new)
± (  0,6 + 0,0100 [t] ) ¹)
- 196 up to + 600
annotation 1: [t] = values of the temperature unsigned
1/10 DIN B = user-specific, only with calibrate protocol

 

Standardized platinum-temperature-sensors

After DIN EN 60751 amounts to 100,000 ohm the face value with 0 ºC. You can speak therefore also from a Pt 100-temperature-sensor. In addition, also temperature-sensors become with face values of 200; 500 and 1000 ohm offered. Their advantage lies in the higher sensitivity, that means a bigger alteration of the resistance-values in dependence on the temperature. The resistance-alterations in the temperature-area until 100 ºC are:

          0,4 Ohm/ K bei Pt 100
          0,8 Ohm/ K bei Pt 200
          2,0 Ohm/ K bei Pt 500
          4,0 Ohm/ K bei Pt 1000

 

 

As further feature size defines DIN a middle temperature coefficient α between 0 ºC and 100 ºC. He gives the middle of resistance amendment, covered on the face value with 0ºC at:


 


R0 and R100 are the resistance-values with the
temperatures 0 °C and 100 ° C .

 

 

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