Weidmuller PT 100/4 signal conditioners for current output Uživatelský manuál stáhnout pdf (Strana 12)

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.

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Weidmuller PT 100/4 signal conditioners for current output Uživatelský manuál Strana 12