Specifications - WIKA TR Manual De Instrucciones

3. Specifications

3. Specifications
3.1 Resistance thermometer
EN
Sensor connection method
2-wire
■
3-wire
■
4-wire
■
Sensor tolerance value per DIN EN 60751
Class B
■
Class A
■
Class AA
■
The combinations of a 2-wire connection with class A or class AA are not permissible, since the
lead resistance of the measuring insert negates the higher sensor accuracy.
Basic values and tolerance values
Basic values and tolerance values for the platinum measurement resistances are laid down in
DIN EN 60751.
The nominal value of Pt100 sensors is 100 Ω at 0 °C. The temperature coefficient α can be stated
simply to be between 0 °C and 100 °C with:
The relationship between temperature and electrical resistance is described by polynomials,
which are also defined in DIN EN 60751. Moreover, this standard specifies the basic values in
°C steps in tabular form. Moreover, this standard specifies the basic values in °C steps in tabular
form.
Temperature range
Class
Wire-wound (W)
B -196 ... +600 °C
A -100 ... +450 °C
AA -50 ... +250 °C
1) | t | is the value of the temperature in °C without consideration of the sign.
Bold: Standard version
For further technical information, see WIKA data sheet and the technical information sheet
IN 00.17 "Usage limitations and accuracies of platinum resistance thermometers per
EN 60751: 2008".
8
-3
α = 3.85 ∙ 10
Thin-film (F)
-50 ... +500 °C
-30 ... +300 °C
0 ... 150 °C
WIKA operating instructions resistance thermometers, thermocouples
-1
°C
Tolerance value in °C
±(0.30 + 0.0050 | t |)
±(0.15 + 0.0020 | t |)
±(0.10 + 0.0017 | t |)
1)
1)
1)