Weidmuller PT 100/4 signal conditioners for current output Instrukcja Użytkownika Pobierz pdf (Strona 11)

4.5 Linearity calibration

1. Carry out a basic calibration, see above.

2. Set the selected " minimum" temperature on a PT 100 simula-

tor (when using a pr ecision resistance decade, wher e neces-

sary 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

max

+ ϑ

min

)/2" on a PT 100 simu-

lator.

Determine the difference to the desired value:

"∆I = shown value on measuring instrument - 12.000 mA"

and calibrate the output signal to (12.000 mA - ∆I) using a

span potentiometer.

4. Set the " maximum" selected temperature ϑ

min

on the 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 Instrukcja Użytkownika Strona 11