Siemens SITRANS P - Page 153

Procedure
● Trim at 4 mA:
Use the menu command "DAC trim" to instruct the device to put out 4 mA. You read the
measured value at an ammeter and enter this value. The device uses this value for offset
correction of the current.
●
Trim at 20 mA:
Use the menu command "DAC trim" to instruct the device to put out 20 mA. You read the
measured value at an ammeter and enter this value. The device uses this value for gradient
correction of the current. The value for 4 mA is not affected by this.
Note
If a multimeter is used, it must always be sufficiently accurate.
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A Original characteristic
B Characteristic curve after DAC trim 4 mA
C Characteristic curve after DAC trim 20 mA
Parameter assignment
9.3 Parameter assignment over remote operation
SITRANS P320/P420 with 4 to 20 mA/HART
Operating Instructions, 11/2019, A5E44852162-AC 153