LJ12A34Z/BX Inductive Proximity Sensor
= Non-Contact Metal Detection Switch for Automation Projects =
The LJ12A34Z/BX is a cylindrical proximity sensor that detects metal objects without physical contact. When a ferrous metal enters its detection zone, the internal magnetic field changes, causing the sensor to output a signal . It can also detect non-ferrous metals like copper or aluminum but at a reduced distance .
Reliable NonContact Detection Detects metal objects without wear or physical contact
Wide Operating Voltage - Supports 6V to 36V DC power range
Output Type: NPN normally open (NO). Output is LOW (0V) when idle, HIGH when detecting metal.
Detection Distance: 4mm for mild steel (shorter for other metals)
Wiring: Brown (VCC), Blue (GND), Black (Signal)
Use with Arduino, ESP32, or PLC for automation, 3D printer auto-leveling, and CNC limit switches .
This sensor operates at 6-36V, which can damage a 5V microcontroller pin. A voltage divider is necessary when connecting to Arduino or similar 5V logic boards .
= Technical Specifications =
| Parameter | Value |
|---|
| -- | -- |
| Model | LJ12A34Z/BX |
| Type | Inductive Proximity Sensor |
| Output | NPN Normally Open (NO) |
| Detection Distance | 4mm for mild steel |
| Operating Voltage | DC 6V to 36V |
| Output Current | ≤ 300mA |
| Response Frequency | 500Hz |
| Body Thread Size | M12 |
| Cable Length | ~ 1 meter (3 wires) |
| Body Material | Nickel-plated brass |
| Protection | IP67 |
Key Features
+Reliable and durable IP67rated housing suitable for harsh environments.
+Visual status indicator - Red LED lights up when metal is detected.
+Short-circuit protection safeguards the sensor and connected devices.
== Applications ==
- Object detection and counting on conveyor belts.
- Limit and end-stop switches for CNC machines and 3D printers .
- Position and speed sensing in factory automation.
- Integration with Arduino and microcontroller projects .
Robust and costeffective Ideal for both industrial and hobbyist projects.
Easy to integrate Simple threewire connection and commonly used interfaces.
√ Preassembled with a 1meter cable and easytoconnect flying leads.
= Wiring Guide =
| Wire Color | Connection |
|---|
| -- | -- |
| Brown | VCC (Positive 6-36V DC) |
| Blue | GND (Power supply ground) |
| Black | Signal (NPN output) |
