Signals & Electrical
4-wire sensor
A sensor using four conductors, often for separate outputs, communication or excitation.
IN ONE SENTENCE
The extra wire allows more functions than a basic three-wire device.
In normal English
The exact purpose varies: dual outputs, separate analogue and switch outputs, RS-485 pairs or bridge excitation are all possible.
Why would I use it?
Use it when the device requires an additional signal or electrical connection.
THINK OF IT LIKE…
A three-wire sensor with an extra lane for another job.
Related terms
3-wire sensor, RS-485, analogue output
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