Level switch
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May I ask which level switches are two-wire and which are four-wire?
For mechanical contact types, there is no such thing as the \"wired\" configuration you mentioned； Electronic version similar to a tuning fork, available in four-wire/three-wire/two-wire configurations
Are there two-wire versions of the tuning fork electronic type?
The image below shows the wiring section of the instruction manual for the Rosemount™ 2120 Level Switch; you can take a look