Circuit - Current Loop Electronic Circuits Designed by David A. Johnson, P.E.


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Current Loop Circuits
Designed by David A. Johnson, P.E.
Last Updated on: Thursday, January 01, 2009 06:56 AM

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4-20ma Current Loop Tester: Using just a few components, this circuit can simulate signals from various instruments, which source a constant current.

Pump Motor Monitor
This circuit can turn on a light or sound a beeper, whenever an AC line powered pump motor turns on. It is designed to detect the motor current using a small inductor placed on the outside of the motor’s power cable. No direct wire contact is needed.

TEMPERATURE SENSOR WITH 4 TO 20mA CURRENT LOOP
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.

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