Weidmüller PT 100/4 Notice D'utilisation page 31

4.5 Linearity calibration
1. Carry out a basic calibration, see above.
2. Set the selected "minimum" temperature on a PT 100
simulator (when using a precision resistance decade, where
necessary observe DIN IEC 751 conversion table from °C
to Ω!) and calibrate the signal conditioner output signal to
4.000 mA using the null potentiometer.
3. Set the mean temperature "(ϑ
simulator.
Determine the difference to the desired value:
"ΔI = shown value on measuring instrument - 12.000 mA"
and calibrate the output signal to (12.000 mA - ΔI) using a
span potentiometer.
4. Set the "maximum" selected temperature ϑ
simulator and calibrate the signal output to 20.000 mA using
the lin potentiometer.
5. Repeat steps 2 to 4 until the required accuracy is achieved.
+ ϑ )/2" on a PT 100
max min
on the PT 100
min
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