Specifications - WIKA TR10-L Manual De Instrucciones

3. Specifications

3. Specifications
3.1 Resistance thermometer
GB
Sensor method of connection
2-wire The lead resistance is recorded as an error in the measurement.
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3-wire With a cable length of approx. 30 m or longer measuring deviations can occur.
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4-wire The inner lead resistance of the connecting wires is negligible.
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Tolerance value of the sensor per DIN EN 60 751
Class B
■
Class A
■
Class AA
■
Combinations of 2-wire connection with Class A or Class AA are not allowed, because the lead
resistance of the measuring insert, over-rides 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 60 751.
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 the temperature and the electrical resistance is characterised by
polynomials, which are also defined in DIN EN 60 751. Furthermore, this standard lays down the
basic values in °C stages.
Class Temperature range
Wire-wound (W)
AA -50 ... +250 °C
A -100 ... +450 °C
B -196 ... +600 °C
1) | t | is the value of the temperature in °C without consideration of the sign
bold: Standard version
10
α = 3,85 ∙ 10
-3
Tolerance value in °C
Thin-film (F)
0 ... 150 °C ± (0.10 + 0.0017 | t |)
-30 ... +300 °C ± (0.15 + 0.0020 | t |)
-50 ... +500 °C ± (0.30 + 0.0050 | t |)
WIKA Operating Instructions Model TR10-L/TC10-L EEx d
°C
-1
1)
1)
1)