{"product_id":"lj12a3-12mm-inductive-proximity-sensor-switch-npn-pnp-dc-6-36v","title":"LJ12A3 12mm Inductive Proximity Sensor NPN PNP DC 6-36V Switch","description":"\n\u003ch2\u003eLJ12A3 12mm Inductive Proximity Sensor Switch – NPN \u0026amp; PNP, DC 6–36V\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eLJ12A3 Inductive Proximity Sensor\u003c\/strong\u003e is a compact, reliable detection switch designed for industrial automation, DIY electronics, CNC machines, 3D printers, and robotics projects. With a 12mm aluminium alloy body, CE certification, and wide 6–36V DC operating voltage, it delivers consistent non-contact object detection in demanding environments. Available in NPN\/PNP Normally Open (NO) and Normally Closed (NC) output configurations to suit virtually any control circuit.\u003c\/p\u003e\n\n\u003cp\u003e\u003cem\u003eMade in Mainland China.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eKey Specifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eModels:\u003c\/strong\u003e LJ12A3-4-ZBX (NPN NO) | LJ12A3-4-ZBY (PNP NO) | LJ12A3-4-ZAX (NPN NC) | LJ12A3-4-ZAY (PNP NC)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDiameter:\u003c\/strong\u003e 12 mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOperating Voltage:\u003c\/strong\u003e DC 6–36V\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMax Output Current:\u003c\/strong\u003e 300 mA\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOutput Type:\u003c\/strong\u003e Three-wire NPN \/ PNP (NO \u0026amp; NC)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCable Length:\u003c\/strong\u003e 110 cm (approx. 43 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBody Material:\u003c\/strong\u003e Aluminium alloy\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCertification:\u003c\/strong\u003e CE\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1 Year\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy Choose This Proximity Sensor?\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eNon-contact detection\u003c\/strong\u003e — no physical wear, longer service life\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eWide voltage range\u003c\/strong\u003e (6–36V DC) for broad compatibility with PLCs, Arduino, Raspberry Pi, and industrial controllers\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eDual output options\u003c\/strong\u003e — NPN \u0026amp; PNP configurations for flexible wiring in any circuit\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eRugged aluminium alloy body\u003c\/strong\u003e — built to withstand vibration, dust, and moisture\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eGenerous 110cm lead wire\u003c\/strong\u003e — easy routing inside enclosures and control panels\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eCE certified\u003c\/strong\u003e — meets international safety and electromagnetic compatibility standards\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTypical Applications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e3D printer bed levelling \u0026amp; end-stop sensing\u003c\/li\u003e\n  \u003cli\u003eCNC machine tool positioning\u003c\/li\u003e\n  \u003cli\u003eConveyor belt object counting \u0026amp; detection\u003c\/li\u003e\n  \u003cli\u003eRobotic arm limit switching\u003c\/li\u003e\n  \u003cli\u003eAutomated assembly line metal part detection\u003c\/li\u003e\n  \u003cli\u003eDIY electronics \u0026amp; Arduino\/PLC projects\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated Products You May Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/air-compressor-pressure-gauge-0-10-0-12-0-25-bar-hydraulic-diy\"\u003eAir Compressor Pressure Gauge 0-10\/0-12\/0-25 Bar | DIY Tool\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/electromagnetic-induction-tester-coil-motherboard-fault-detector\"\u003eElectromagnetic Induction Tester – Coil \u0026amp; Circuit Fault Detector\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/360-bicycle-chain-cleaner-tool-gear-cleaning-kit\"\u003e360° Bicycle Chain Cleaner Tool | Bike Gear Cleaning Kit\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.osha.gov\/hand-power-tools\" target=\"_blank\" rel=\"noopener\"\u003eOSHA guidance on hand and power tools\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\n\u003ch4\u003eQ: What is the detection range of the LJ12A3 inductive proximity sensor?\u003c\/h4\u003e\n\u003cp\u003eA: The LJ12A3-4-Z series has a standard sensing distance of approximately 4 mm for ferrous (steel\/iron) metal targets. Detection distance may vary slightly for non-ferrous metals such as aluminium or copper.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What is the difference between NPN and PNP output on this proximity switch?\u003c\/h4\u003e\n\u003cp\u003eA: NPN (sinking) output pulls the signal wire LOW when an object is detected, making it compatible with most PLCs and microcontrollers that use active-low inputs. PNP (sourcing) output pulls the signal wire HIGH when triggered, suitable for active-high input devices. Choose the configuration that matches your controller's input type.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Can I use this inductive proximity sensor with an Arduino or Raspberry Pi?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. When powered from a 6V–36V supply, the NPN NO (ZBX) model outputs a low-side signal compatible with Arduino digital input pins (with a pull-up resistor). Ensure your supply voltage and signal level match your microcontroller's logic levels. A 5V or 12V bench supply works well for most hobby applications.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Is this sensor waterproof or suitable for outdoor use?\u003c\/h4\u003e\n\u003cp\u003eA: The aluminium alloy housing provides good resistance to dust and light splashing, but the LJ12A3 series is not rated to a specific IP ingress protection standard in the provided specifications. For fully outdoor or high-pressure washdown environments, verify IP rating requirements before installation.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What is the detection range of the LJ12A3 inductive proximity sensor?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The LJ12A3-4-Z series has a standard sensing distance of approximately 4 mm for ferrous (steel\/iron) metal targets. 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