Weidmuller PT 100/4 signal conditioners for current output - Manual (Page 8)

26
Example
Chosen measurement -50 ... +150 °C →
200 K span
range: 1 % fr om 200 K span = 2 K
Set minimum temperature -50 °C + 2 K = -48 °C
on the PT 100 simulator and calibrate the signal conditioner out-
put signal to 0.200 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 a PT 100 simulator
Then determine
∆
I:
∆
I = measured value from measuring
instrument - 10.000 mA
→
∆
I = 9.940 mA - 10.000 mA
= -0.060 mA
Then calibrate the output signal to (10.000 mA -
∆
I) using the
span potentiometer i.e. her e an example.
"10.000 mA - (-0.060 mA) = 10.060 mA"
Then set the maximum temperature on the PT 100 simulator
(150 °C) and calibrate the output signal to 20.000 mA using the
lin potentiometer .