Current Sensor Calibration (Digital-To-Analog Trim); Function - Siemens SITRANS T4200 Operating Instructions Manual

9.14

Current sensor calibration (digital-to-analog trim)

9.14.1

Function

This function allows you to calibrate the current output by the transmitter regardless of the
sensor circuit. This function allows compensation of inaccuracies in the process chain
downstream from the transmitter. The trim can only be performed as follows:
● Device version 200: at 4 mA and at 16 mA
● Device version 300: at 4 mA and at 20 mA
The following figure shows the principle of trimming using the example of the 4 to 20 mA
current output.
O Output characteristic
B
C Characteristic curve after current transmitter
Figure 9-3
See also
Application example: Current input calibration at 4 mA and 20 mA (Page 54)
SITRANS TH200/TH300
Operating Instructions, 06/2010, A5E00393069-03
Characteristic curve after current transmitter
trim 4 mA
trim 20 mA
Current transmitter trim
9.14 Current sensor calibration (digital-to-analog trim)
①
A→B: Parallel offset
②
B→C: Change in gradient
Functions
53