LED working indicator: signal indicator, when sensing metal objects the light is on for normally open, the light is off for normally closed.
Wiring Method: Brown connect to Positive, Blue connect to Negative, Black connect to Load (signal output).
NPN: common positive voltage, output negative voltage. PNP: common negative voltage, output positive voltage. NO: normally open. NC: normally closed.
When proximity switch is close to some target object, it will send out control signal. Widely used for machine tool industry, frequency counters and other automatic control system, or you can use it for DIY 3D Printer.
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Haldzemo Inductive Proximity Sensor M12 LJ12A3-4-Z/BX Normally Open Detection Approach Switch 4mm NPN NO 3 Wire DC 6V-36V (4 Pack)
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SW-420 Normally Closed Vibration Sensor Module, Alarm Sensing Module, Vibration Switch 5pcs
KWD 3
