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LJ12A3-4-Z/BY Inductive Proximity Sensor – PNP NO, 4 mm

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LJ12A3-4-Z/BY Inductive Proximity Sensor - PNP NO, 4 mm

Brand LEFIRCKO CLICK IT SKU CLICK-IT-704791 Category Components

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  • Brand LEFIRCKO

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Overview

The LJ12A3-4-Z/BY is an M12 inductive proximity sensor for detecting metal without contact. Its PNP normally-open output switches on when a suitable metal target enters the nominal 4 mm sensing range. Use it for position sensing and end-stop detection with a compatible DC control input.

Specifications

ModelLJ12A3-4-Z/BY
OutputPNP, normally open, three-wire
Supply6 to 36 V DC; nominal 12 to 24 V
Nominal sensing distance4 mm ±10% with iron target
Recommended set distance0 to 3.6 mm
Maximum output current300 mA
Response frequency500 Hz
MountingM12 threaded barrel, non-flush
Body length56.7 mm nominal, excluding cable relief
Housing / sensing faceNickel-plated brass / ABS
Enclosure ratingIP67; protect cable joints separately
Temperature-30 to +65 °C, no condensation or freezing

Datasheets

Full technical datasheetPDF

What’s in the box

1×
LJ12A3-4-Z/BY sensor with attached cable

Includes two mounting nuts and two lock washers.

Great for

Metal part detection
Position sensing on jigs
CNC end stops with a compatible PNP input

Wiring & getting started

  1. Check the input and wiring

    Confirm the diagram on the supplied sensor. Standard three-wire PNP wiring is brown to positive, blue to 0 V and black to the compatible input or load, with its return at 0 V.

  2. Mount and power it

    Keep the blue sensing face proud of surrounding metal. With power off, connect a regulated DC supply within the stated range. Apply power and bring an iron target within the set distance.

  3. Check detection

    The input should activate near the target and release when it is removed. Allow for a shorter detection range with non-magnetic metals.

Note: The PNP output can approach the sensor supply voltage. Use a suitable interface for 3.3 V or 5 V logic; do not connect the output directly to a microcontroller GPIO. Replacing an NPN sensor requires checking the controller input and wiring.

Specification

Specification for LJ12A3-4-Z/BY Inductive Proximity Sensor - PNP NO, 4 mm
CLICK IT SKU CLICK-IT-704791
Brand LEFIRCKO

Features

The LJ12A3-4-Z/BY is an M12 inductive proximity sensor for detecting metal without contact. Its PNP normally-open output switches on when a suitable metal target enters the nominal 4 mm sensing range. Use it for position sensing and end-stop detection with a compatible DC control input.…

  • Brand LEFIRCKO

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