Weidmuller PT 100/4 signal conditioners for current output - Manual (Page 12)

30
Example
Chosen measuring range:
-50 ... +150 °C
Set minimum temperature (-50 °C)
on the PT 100 simulator and calibrate the signal conditioner out-
put signal to 4.000 mA using the null potentiometer .
Mean temperatur e
= (
ϑ
max
+
ϑ
min
)/2
= (150 °C + (-50 °C))/2
= 50 °C
Set the 50 °C value on the PT 100 simulator
Then determine
∆
I:
∆
I = measured value from measuring
instrument - 12.000 mA
→
∆
I = 11.940 mA - 12.000 mA
= -0.060 mA
Then calibrate the output signal to (12.000 mA -
∆
I) using the
span potentiometer i.e. her e an example.
"12.000 mA - (-0.060 mA) = 12.060 mA"
Then set the maximum temperature on the PT 100 simulator and
calibrate the output signal to 20.000 mA using the lin potentiome-
ter.