# Inductive proximity sensor, LJ12A3-4-Z/BX, NPN, 6-36V

> Inductive proximity sensor LJ12A3-4-Z/BX, NPN normally open type, for detecting metal objects. Supply voltage 6-36VDC, detection distance 4mm, M12 housing (11.7mm), 1m cable. Compatible with Arduino and other development boards, commonly used for 3D printer autolevel.

- Page: https://sigmanortec.ro/en/inductive-proximity-sensor-lj12a3-4-z-bx-npn-6-36v
- Price: 16.24 RON
- Availability: In stock; 1-2 zile
- Reference: 22210 · EAN: 5946206346182
- Category: Mechatronics and IoT > Sensors and Modules > Proximity and Photoelectric Sensors
- Specifications: Maximum Input Voltage: 36; Input Voltage Type: “DC” in Romanian can mean **“de ce”**, which translates to **“why”** in English.
- Package (shipping data): 0.044 kg
- Updated: 2026-09-14
- Shop: [Sigmanortec.ro](https://sigmanortec.ro/en/llms.txt)
- Prices: RON, VAT included; prices and stock as of 2026-10-22 01:32 (Europe/Bucharest)

## Description

NPN inductive proximity sensor for precise detection of metal objects, ideal for autoleveling in 3D printers and Arduino projects. It operates at 6-36VDC, has a detection distance of up to 4mm, NPN normally open output for easy integration, compact M12 housing and 1m cable for quick installation.
Inductive NPN proximity sensor, compatible with Arduino and other development boards.
Compatible for autolevel 3d printers (see picture)
Model: LJ12A3-4-Z/BX
Supply voltage: 6-36VDC
Detection distance: 4mm
Transistor type: NPN (normally open)
Wire length: 1 m
Thickness: 11.7mm (M12)
Assembly diagram:
3D Printer Assembly Scheme: