# Inductive proximity sensor, PNP, LJ12A3-4, Z-BY, 6-36V

- Page: https://sigmanortec.ro/en/inductive-proximity-sensor-pnp-lj12a3-4-z-by-6-36v
- Price: 14.77 RON
- Availability: In stock; 1-2 zile
- Reference: 88147 · EAN: 5943808428759
- 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): 0.039 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 02:21 (Europe/Bucharest)

## Description

PNP inductive sensor for non-contact detection of metal objects in automation and machinery. Offers a detection distance of up to 4 mm, operates at 6-36V DC, has a robust M12 metal housing with IP65 protection and red LED for activation indication. NO output for easy integration into PLCs, microcontrollers or input modules.
PNP inductive sensor from the LJ12A3-4 series, designed for applications where it is necessary to identify metal objects without physical contact. It has a robust metal construction and a detection distance of up to 4 mm.
The nickel-plated brass housing and ABS sensing surface ensure durability and resistance to industrial environments. It operates at voltages between 6 and 36V DC and is equipped with a red LED to indicate activation. Reverse polarity protection and IP65 protection rating make it suitable for use in various industrial environments.
The sensor is of the NO (Normally Open) type, meaning it is Normally Open.
Do not connect the sensor output (black wire) directly to a consumer (e.g. lamp, motor, power relay, etc.). The output is designed to be connected to a logic input of a controller (PLC, microcontroller, optocoupler relay module, etc.), not to directly control high current consumption loads.
Specifications:
Supply voltage: 6-36V DC
Model: LJ12A3-4-Z/BY cylindrical series
Type: PNP
Output: NO, Normally Open contact
Mounting type: Non-shielded
Output current: max. 300mA (DC)
Detection distance: 4 mm (ideal 0-3.2 mm)
Standard detected object: Mild steel 12x12x1 mm
Frequency response: 500 Hz
Operating indication: red LED
Protections: Reverse connection protection. No short circuit protection
Protection degree: IP65
Operating temperature range: -25°C to +70°C
Cable length: 1.2 m
Housing material: Nickel-plated brass
Sensory surface: ABS
Thread: M12
Dimensions: 12 x 60 mm
Instructions for use:
Install the sensor on an M12 compatible mount, ensuring a clear distance from other metal objects that could interfere with detection.
Login:
Thread color
Function
Log in
Brown
Power supply +Vcc
+6...36V DC
Blue
GND (ground)
0V (minus power)
Black
Signal output (PNP)
Controller / relay digital input (active on detection)
The metal object inserted within the range of 0–4 mm will activate the sensor output and light up the red LED.
Test with a ferromagnetic metal object (e.g. steel screw) to confirm correct activation.
Avoid incorrect wire connections and do not use the sensor in applications with currents above 300mA or in the presence of excessive moisture.
Do not connect the sensor output (black wire) directly to a consumer (e.g. lamp, motor, power relay, etc.). The output is designed to be connected to a logic input of a controller (PLC, microcontroller, optocoupler relay module, etc.), not to directly control high current consumption loads.
If control of a consumer is necessary, use an intermediate relay or a switching transistor, appropriately sized, protected with a flyback diode if necessary.
Exceeding the maximum allowed current (300 mA) may lead to permanent sensor failure.