Weidmuller PT 100/4 signal conditioners for current output Manual de usuario descargar pdf (Pagina 7)

4.3 Linearity calibration

1. Proceed with basic calibration, see above.

2. Add 1 % of the temperature span to the selected " minimum"

temperature and set this value on a PT 100 simulator (when

using a precision resistance decade, where necessary ob-

serve DIN IEC 751 conversion table from °C to Ω!) and cali-

brate the signal conditioner output signal to 0.200 mA using

the null potentiometer.

3. Set the mean temperatur e "(ϑ

max

+ ϑ

min

)/2" on a PT 100 simu-

lator.

Determine the difference to the desired value:

"∆I = shown value on measuring instrument - 10.000 mA"

and calibrate the output signal to (10.000 mA - ∆I) using the

span potentiometer.

4. Set the " maximum" selected temperature ϑ

max

on a PT 100

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.

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Weidmuller PT 100/4 signal conditioners for current output Manual de usuario Pagina 7