Hook Sensor Loop Circuit

Posted on Jul 23, 2012

Here`s an effective for a temperature sensor to receive power from a 4-to-20 mA loop without actually affecting the loop current (see the figure). This particular temperature sensor IC (AD590F) conducts 1 / when powered by a supply in the range of 4 V to 40 Vdc. The scheme uses a 5-V Zener diode (Dl) to regulate the power source for AD590F. Most of the current flows through the Zener diode and a small current flows through AD590F.

Hook Sensor Loop Circuit
Click here to download the full size of the above Circuit.

The device can read the temperature information across Rl, which is a 1 mV/K in the range of-55C to 150C. The waste of power is negligible in this arrangement.

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