The M12 Inductive Proximity Sensor PNP model LJ12A3-4-ZBY detects the presence of metal objects within 4mm without any physical contact. Inductive proximity (a sensing method that uses a magnetic field to detect nearby metal) means the sensor never touches the target, so there is no mechanical wear over time. The lj12a3-4-z/by inductive proximity sensor has a 12mm threaded cylindrical body that threads directly into standard industrial sensor brackets.
The lj12a3-4-z/by inductive proximity operates on 5V to 36V DC, which makes it usable with both 5V Arduino projects and 24V industrial control panels. One non-obvious detail — the output is NPN Normally Open, meaning the output wire is floating at rest and pulls LOW when metal is detected. Connect a pull-up resistor when reading this with a microcontroller GPIO. The honest limitation is that it only detects metal surfaces. Plastic, wood, or paper targets produce no output change regardless of distance.
The inductive proximity sensor pnp no connects to Arduino, PLC (Programmable Logic Controller), and digital input pins. robotics students, and conveyor system builders use it regularly. To start, connect brown to supply positive, blue to GND, and black to your GPIO with a pull-up. StemVolt provides proximity Sensor PNP tested with confirmed 4mm detection confirmed on steel.
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Features:
- 4mm non-contact metal detection via electromagnetic induction principle
- NPN NO three-wire output with 300mA current handling capacity
- 5V to 36V wide range suits Arduino and 24V PLC input cards
- M12 threaded metal housing for industrial panel and bracket mounting
- No moving parts — solid-state detection with long service life
Technical specifications:
Applications:
- LJ12A3-4-ZBY Sensor used for Arduino metal object position detection build
- CNC machine uses M12 proximity sensor for end-stop position sensing
- Assembly line uses inductive proximity sensor for part presence verification
- Robot arm uses LJ12A3-4-ZBY M12 Sensor for gripper position feedback
Package includes:
- 1 x LJ12A3-4-ZBY M12 Inductive Proximity Sensor PNP NO
Piyush Toshniwal –
Fully satisfied purchase
Abhishek Mantri –
Inductive proximity sensor provides reliable non-contact metal detection and is ideal for robotics, automation, and industrial control projects.
Utkarsh Mandowara –
Product intact received
Rajat Bangad –
Prompt delivery service
Kriti Nyati –
Received this PNP proximity sensor with prompt delivery, product arrived intact and detection performance was accurate throughout my robotics project testing.
Nidhi Ladha –
Bought from an electronics parts store for an automation setup, sensor worked exactly as described and support team provided helpful technical assistance.
Divya Birla –
Exactly as described