Consider this diagram of two wire loops. It is the basic sensor used in some anti-shoplifting systems. I am told that it was patented in 1938 by one Pierre Picard and that it is called the “Picard ...
To complement the 2-wire and 3-wire sensor transmitter blogs that Kevin Duke and I have already published on Precision Hub, my next few blog topics will be on 4-wire sensor transmitters. The blogs ...
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