Wika TR12-M Manual do Utilizador descarregar pdf (Página 9)

14064370.01 08/2013 GB/D

WIKA operating instructions models TR12, TC12 9

3. Specications

3.1 Resistance thermometer

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 coecient α can be

stated simply to be between 0 °C and 100 °C with:

α = 3.85 ∙ 10

-3

°C

-1

The relationship between temperature and electrical resistance is described by

polynomials, which are also dened in DIN EN 60751. Moreover, this standard species the

basic values in °C steps in tabular form. Moreover, this standard species the basic values

in °C steps in tabular form.

Class

Temperature range

Tolerance value in °C

Wire-wound (W) Thin-lm (F)

B -196 … +600 °C -50 … +500 °C ±(0.30 + 0.0050 | t |)

A -100 … +450 °C -30 … +300 °C ±(0.15 + 0.0020 | t |)

AA -50 … +250 °C 0 … 150 °C ±(0.10 + 0.0017 | t |)

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”.

3. Specications

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