Detection 4 ~ 20mA loop instrument amplifier (ISO120,XTR101)circuit diagram

Published:2011/5/16 20:43:00 Author:Ecco | Keyword: Detection , 4mA, 20mA, loop instrument , amplifier | From:SeekIC

The RTDs isolated detection 4 ~ 20mA loop instrument amplifier circuit composed of ISO120 and INA105, XTR101 instrumentation amplifier is shown as the chart. Resistance temperature detector (RTD) can test temperature changing, the temperature changing can be changed into electrical signals which is input current loop amplifier XTR101, XTR101 transforms it into the 4 ~ 20mA current output, and the 4 ~ 20mA current is changed into voltage signal on the resistor RL by the twisted pair wires passing, and then amplified by the INA105 and sent to the isolation amplifier ISO120, and then it is isolated, amplified and output by ISO120. The main feature of the circuit is that the circuit uses XTR101 to transforme the input into 4 ~ 20mA current, the current signal can be transmitted in long distance, and it is not easy to get interference.



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