TEMPERATURE SENSOR WITH 4 TO 20mA CURRENT LOOP

Published:2012/9/10 20:24:00 Author:Ecco | Keyword: TEMPERATURE SENSOR , 4 TO 20mA , CURRENT LOOP | From:SeekIC

I designed a circuit similar to this one years ago to accurately measure the air temperature inside a building 1000s of feet from a control room. The circuit uses a very robust current loop method. It uses a highly accurate semiconductor temperature sensor and an equally accurate voltage reference. The circuit includes a diode bridge, so it is polarity independent. By using the component values indicated, the circuit should not require calibration. It has a range from ?40F to +120F and an accuracy of +/- one degree F. Source: discovercircuits



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