Weidmuller PT 100/4 signal conditioners for current output Manual do Utilizador descarregar pdf (Página 5)

4.2 Basic calibration with a signal output from 0 ... 20 mA

1. Select the temperature range on the printed circuit board

using the DIP switch, see table on the module or pages 41

and 42.

The DIP switches 1, 2 and 3 set the minimum input tempera-

ture ϑ

min

The span (difference between minimum and maximum input

temperature) is set using the DIP switches 4, 5 and 6.

2. Professionally install module.

3. Add 1 % of the temperatur e span to the selected “ minimum”

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

using a pr ecision resistance decade, wher e necessary ob-

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

brate the signal conditioner output signal to 0.200 mA using

the null potentiometer. (The potentiometers are located be-

hind the hinged cover).

4. Set the “ maximum” selected temperature on a PT 100 simu-

lator (or precision resistance decade) and calibrate the signal

output to 20.000 mA using the S pan potentiometer .

5. Repeat steps 3 and 4 (approx. 2-3 times), until the required

accuracy is achieved.

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Weidmuller PT 100/4 signal conditioners for current output Manual do Utilizador Página 5