Testing 4 ~ 20mA loop equipment amplifier (ISO122P/124, XTR101, RCV420) circuit diagram

Published:2011/5/17 2:33:00 Author:Ecco | Keyword: testing, 4 ~ 20mA, loop equipment , amplifier | From:SeekIC

The RTDs isolated detection 4 ~ 20mA loop instrument amplifier circuit composed of ISO122P／124 and loop current transmission circuit XTR101, the loop current receiver circuit CV420 is shown as the chart. Resistance temperature detector (RTD) can test temperature changing, the temperature changing can be transformed into electrical signals input by XTR101, and then it is changed into the 4 ~ 20mA current output by XTR101, and then it transfered by the twisted pair and received by RCV420 , then the 4 ~ 20mA current is changed into voltage signal, the voltage signal is amplified and sent to isolation amplifier ISO122P, amplified, isolated by the ISO122P and it outputs 0 ~ 5V voltage.



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