Tube Type Inductive Proximity Sensor Detection Switch NPN DC6-36V 4mm Normally Open switch LJ12A3-4-Z/BX

📡 LJ12A3-4-Z/BX inductive proximity sensor (tube type)
⚡ Wide supply range: DC 6–36V
🎯 Detection distance: 4mm (metal targets)
🔁 NPN output, Normally Open (NO) switching
🧩 Ideal for automation, CNC, 3D printers, and limit sensing
🛠️ Threaded metal body for easy mounting and adjustment
💡 Built-in indicator LED shows detection status
✅ Reliable non-contact sensing for industrial applications

SKU: EK1346 Categories: Proximity Sensor, Sensors Tags: Proximity Sensor, Sensors

Apple Shopping Event

Hurry and get discounts on all Apple devices up to 20%

150,00 EGP

Compare

15 People watching this product now!

Payment Methods:

Description

This Tube Type Inductive Proximity Sensor Detection Switch NPN DC6-36V 4mm Normally Open switch LJ12A3-4-Z/BX is a component widely used in automatic control industry for detecting, controlling, and non-contact switching. When the proximity switch is close to some target object, it will send out control signal.

When the metal approaches near-proximity switch sensing area, an Edy Current is induced in metal. Which in turn disturbs the magnetic field produced by the Inductive Proximity Sensor. This change is sensed by the sensor.

This inductive proximity switches can be non-contact, no pressure, no spark, quickly issued the electrical command. Accurately reflect the position and the stroke movement mechanism. Positioning accuracy, operating frequency, service life. Easy to install and suitable for harsh environments.

This 4mm proximity sensor can detect a variety of metals, miniature size, long life, low price, shielded type installation, anti-interference ability, 1mm detection distance, using for precise positioning of molds, precision machine tools, and robots.

Features :

Red LED checks the state of the proximity sensor
High repeated positioning accuracy
High switching frequency
Wide voltage range
Outer (Theard) Diameter: M12
Antivibration, dust, water and oil prevention
Reverse power protection, short circuit protection, directly connecting with PLC
Can replace small switches and limit switches

Package Includes :

1 x DC 6-36V M12 Inductive 4mm NPN-NO Proximity Sensor Switch

🔌

Pin Connections

1 Table

Pin Connections Table 1

Board	Sensor Pin	Connection
LJ12A3-4-Z/BX	Brown/Blue/Black	6-36V / GND / board digital pin (use INPUT_PULLUP)

📟

Tube Type Inductive Proximity Sensor Detection Switch NPN DC6-36V 4mm Normally Open switch LJ12A3-4-Z/BX

7 Examples • C/C++ | Boards: Arduino Uno, Arduino Nano, Arduino Mega, ESP32, ESP8266, STM32, Raspberry Pi Pico

Wrap

Tube Type Inductive Proximity Sensor Detection Switch NPN DC6-36V 4mm Normally Open switch LJ12A3-4-Z/BX - Arduino Uno

Tube Type Inductive Proximity Sensor Detection Switch NPN DC6-36V 4mm Normally Open switch LJ12A3-4-Z/BX - Arduino Nano

Tube Type Inductive Proximity Sensor Detection Switch NPN DC6-36V 4mm Normally Open switch LJ12A3-4-Z/BX - Arduino Mega

Tube Type Inductive Proximity Sensor Detection Switch NPN DC6-36V 4mm Normally Open switch LJ12A3-4-Z/BX - ESP32

Tube Type Inductive Proximity Sensor Detection Switch NPN DC6-36V 4mm Normally Open switch LJ12A3-4-Z/BX - ESP8266

Tube Type Inductive Proximity Sensor Detection Switch NPN DC6-36V 4mm Normally Open switch LJ12A3-4-Z/BX - STM32

Tube Type Inductive Proximity Sensor Detection Switch NPN DC6-36V 4mm Normally Open switch LJ12A3-4-Z/BX - Raspberry Pi Pico

📄 File: tube_type_inductive_proximity_sensor_detection_switch_npn_dc6-36v_4mm_normally_open_switch_lj12a3-4-z/bx_-_arduino_uno.inoArduino Uno

344 characters

1//ekostra.com

2//electronics store in egypt

3//+201008896258

5// Digital pin 2 on Arduino Uno

6#define SWITCH_PIN 2

8void setup() {

9 Serial.begin(115200);

10 pinMode(SWITCH_PIN, INPUT_PULLUP);

11}

13void loop() {

14 int state = digitalRead(SWITCH_PIN);

15 Serial.println(state == LOW ? "Metal object: TRIGGERED" : "Metal object: idle");

16 delay(200);

17}

📄 File: tube_type_inductive_proximity_sensor_detection_switch_npn_dc6-36v_4mm_normally_open_switch_lj12a3-4-z/bx_-_arduino_nano.inoArduino Nano

345 characters

1//ekostra.com

2//electronics store in egypt

3//+201008896258

5// Digital pin 2 on Arduino Nano

6#define SWITCH_PIN 2

8void setup() {

9 Serial.begin(115200);

10 pinMode(SWITCH_PIN, INPUT_PULLUP);

11}

13void loop() {

14 int state = digitalRead(SWITCH_PIN);

15 Serial.println(state == LOW ? "Metal object: TRIGGERED" : "Metal object: idle");

16 delay(200);

17}

📄 File: tube_type_inductive_proximity_sensor_detection_switch_npn_dc6-36v_4mm_normally_open_switch_lj12a3-4-z/bx_-_arduino_mega.inoArduino Mega

345 characters

1//ekostra.com

2//electronics store in egypt

3//+201008896258

5// Digital pin 2 on Arduino Mega

6#define SWITCH_PIN 2

8void setup() {

9 Serial.begin(115200);

10 pinMode(SWITCH_PIN, INPUT_PULLUP);

11}

13void loop() {

14 int state = digitalRead(SWITCH_PIN);

15 Serial.println(state == LOW ? "Metal object: TRIGGERED" : "Metal object: idle");

16 delay(200);

17}

📄 File: tube_type_inductive_proximity_sensor_detection_switch_npn_dc6-36v_4mm_normally_open_switch_lj12a3-4-z/bx_-_esp32.inoESP32

338 characters

1//ekostra.com

2//electronics store in egypt

3//+201008896258

5// Digital pin 4 on ESP32

6#define SWITCH_PIN 4

8void setup() {

9 Serial.begin(115200);

10 pinMode(SWITCH_PIN, INPUT_PULLUP);

11}

13void loop() {

14 int state = digitalRead(SWITCH_PIN);

15 Serial.println(state == LOW ? "Metal object: TRIGGERED" : "Metal object: idle");

16 delay(200);

17}

📄 File: tube_type_inductive_proximity_sensor_detection_switch_npn_dc6-36v_4mm_normally_open_switch_lj12a3-4-z/bx_-_esp8266.inoESP8266

342 characters

1//ekostra.com

2//electronics store in egypt

3//+201008896258

5// Digital pin D4 on ESP8266

6#define SWITCH_PIN D4

8void setup() {

9 Serial.begin(115200);

10 pinMode(SWITCH_PIN, INPUT_PULLUP);

11}

13void loop() {

14 int state = digitalRead(SWITCH_PIN);

15 Serial.println(state == LOW ? "Metal object: TRIGGERED" : "Metal object: idle");

16 delay(200);

17}

📄 File: tube_type_inductive_proximity_sensor_detection_switch_npn_dc6-36v_4mm_normally_open_switch_lj12a3-4-z/bx_-_stm32.inoSTM32

342 characters

1//ekostra.com

2//electronics store in egypt

3//+201008896258

5// Digital pin PB4 on STM32

6#define SWITCH_PIN PB4

8void setup() {

9 Serial.begin(115200);

10 pinMode(SWITCH_PIN, INPUT_PULLUP);

11}

13void loop() {

14 int state = digitalRead(SWITCH_PIN);

15 Serial.println(state == LOW ? "Metal object: TRIGGERED" : "Metal object: idle");

16 delay(200);

17}

📄 File: tube_type_inductive_proximity_sensor_detection_switch_npn_dc6-36v_4mm_normally_open_switch_lj12a3-4-z/bx_-_raspberry_pi_pico.inoRaspberry Pi Pico

350 characters

1//ekostra.com

2//electronics store in egypt

3//+201008896258

5// Digital pin 2 on Raspberry Pi Pico

6#define SWITCH_PIN 2

8void setup() {

9 Serial.begin(115200);

10 pinMode(SWITCH_PIN, INPUT_PULLUP);

11}

13void loop() {

14 int state = digitalRead(SWITCH_PIN);

15 Serial.println(state == LOW ? "Metal object: TRIGGERED" : "Metal object: idle");

16 delay(200);

17}

Project Notes:

NPN inductive proximity sensor (detects metal, not magnets).

نظرة عامة ومواصفات المنتج — بالعربية

Tube Type Inductive Proximity Sensor Detection Switch NPN DC6-36V 4mm Normally Open switch LJ12A3-4-Z/BX متوفر الآن في متجر إكوسترا للإلكترونيات، ضمن قسم Proximity Sensor وSensors، بسعر 150,00 EGP. كود المنتج لدينا: EK1346. المنتج غير متوفر حالياً — تواصل معنا عبر واتساب لمعرفة موعد توفره القادم.

أهم المواصفات الفنية:

Product Name: Inductive Proximity Sensor (Tube Type) LJ12A3-4-Z/BX
Category: Sensor → Inductive Proximity Sensor
الموديل: LJ12A3-4-Z/BX
Sensor Type: Inductive (Metal Detection)
Sensing Distance: 4 mm
Output Type: NPN
Switch Type: Normally Open (NO)
Supply Voltage: DC 6–36 V

هذا المنتج مناسب لمشاريع الأردوينو (Arduino) و ESP32 و Raspberry Pi، ومشاريع الروبوتات وإنترنت الأشياء والتعليم الهندسي. جميع القطع مفحوصة قبل الشحن.

تصفّح المزيد من Proximity Sensor في إكوسترا.

Specification

WeightWeight	6 g
Dimensions	3 × 2 × 1 cm
Product Name	Inductive Proximity Sensor (Tube Type) LJ12A3-4-Z/BX
Category	Sensor → Inductive Proximity Sensor
Model	LJ12A3-4-Z/BX
Sensor Type	Inductive (Metal Detection)
Sensing Distance	4 mm
Output Type	NPN
Switch Type	Normally Open (NO)
Supply Voltage	DC 6–36 V
Body Type	Cylindrical (Tube)
Thread Size	M12 (typical for LJ12 series)
Connection	3-Wire Cable (Brown: V+, Blue: GND, Black: OUT)
Mounting Type	Threaded Mount (Nut included, typical)
Applications	automation, metal position sensing, CNC/3D printers, limit detection, industrial control