{"product_id":"lj12a3-4-zbx-inductive-proximity-sensor-npn-no","title":"LJ12A3-4-Z\/BX Inductive Proximity Sensor - NPN NO, 4 mm","description":"\u003cdiv class=\"nznpd\"\u003e\n\u003cdiv class=\"nznpd__lead\"\u003e\n\u003cp class=\"nznpd__intro\"\u003eThe LJ12A3-4-Z\/BX is an M12 inductive proximity sensor that detects metal without touching it. Its NPN normally-open output pulls the black wire to 0 V when steel comes within about 4 mm of the blue face, which suits CNC and 3D printer end stops, part counters and PLC inputs that expect a sinking signal. For a sourcing (PNP) input, choose the \u003ca href=\"\/products\/lj12a3-4-zby-inductive-proximity-sensor-pnp-no\"\u003eLJ12A3-4-Z\/BY PNP version\u003c\/a\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003csection class=\"nznpd__block\"\u003e\n\u003ch3 class=\"nznpd__h\"\u003eSpecifications\u003c\/h3\u003e\n\u003cdiv class=\"nznpd__specs\"\u003e\n\u003cdiv class=\"nznpd__spec\"\u003e\n\u003cspan\u003eModel\u003c\/span\u003e\u003cstrong\u003eLJ12A3-4-Z\/BX\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"nznpd__spec\"\u003e\n\u003cspan\u003eOutput\u003c\/span\u003e\u003cstrong\u003eNPN, normally open, 3-wire\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"nznpd__spec\"\u003e\n\u003cspan\u003eSupply\u003c\/span\u003e\u003cstrong\u003e6 to 36 V DC (12 to 24 V nominal)\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"nznpd__spec\"\u003e\n\u003cspan\u003eSensing distance\u003c\/span\u003e\u003cstrong\u003e4 mm ±10% with a steel target\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"nznpd__spec\"\u003e\n\u003cspan\u003eSet distance\u003c\/span\u003e\u003cstrong\u003e0 to 3.6 mm\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"nznpd__spec\"\u003e\n\u003cspan\u003eOutput current\u003c\/span\u003e\u003cstrong\u003e300 mA maximum\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"nznpd__spec\"\u003e\n\u003cspan\u003eResponse frequency\u003c\/span\u003e\u003cstrong\u003e500 Hz\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"nznpd__spec\"\u003e\n\u003cspan\u003eBody\u003c\/span\u003e\u003cstrong\u003eM12 thread, 56.7 mm long, non-flush\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"nznpd__spec\"\u003e\n\u003cspan\u003eHousing \/ face\u003c\/span\u003e\u003cstrong\u003eNickel-plated brass \/ ABS\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"nznpd__spec\"\u003e\n\u003cspan\u003eRating\u003c\/span\u003e\u003cstrong\u003eIP67 sensor body\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"nznpd__spec\"\u003e\n\u003cspan\u003eTemperature\u003c\/span\u003e\u003cstrong\u003e-30 to +65 °C\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"nznpd__spec\"\u003e\n\u003cspan\u003eWires\u003c\/span\u003e\u003cstrong\u003eBrown +V, blue 0 V, black output\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\n\u003csection class=\"nznpd__block\"\u003e\n\u003ch3 class=\"nznpd__h\"\u003eDatasheets\u003c\/h3\u003e\n\u003cdiv class=\"nznpd__ds\"\u003e\n\u003ca class=\"nznpd__dsbar\" href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0664\/6127\/0112\/files\/LJ12A3-4-ZBX-Datasheet-v1.pdf\" target=\"_blank\" rel=\"noopener\" aria-label=\"Download the LJ12A3-4-Z\/BX datasheet (PDF)\"\u003e\n\u003csvg width=\"20\" height=\"20\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\u003e\u003cpath d=\"M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8z\"\u003e\u003c\/path\u003e\u003cpolyline points=\"14 2 14 8 20 8\"\u003e\u003c\/polyline\u003e\u003c\/svg\u003e\n\u003cspan\u003eFull technical datasheet\u003c\/span\u003e\n\u003cspan class=\"nznpd__dsmeta\"\u003ePDF\u003csvg width=\"17\" height=\"17\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\u003e\u003cpath d=\"M21 15v4a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2v-4\"\u003e\u003c\/path\u003e\u003cpolyline points=\"7 10 12 15 17 10\"\u003e\u003c\/polyline\u003e\u003cline x1=\"12\" y1=\"15\" x2=\"12\" y2=\"3\"\u003e\u003c\/line\u003e\u003c\/svg\u003e\u003c\/span\u003e\n\u003c\/a\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\n\u003csection class=\"nznpd__block\"\u003e\n\u003ch3 class=\"nznpd__h\"\u003eWhat's in the box\u003c\/h3\u003e\n\u003cdiv class=\"nznpd__included\"\u003e\n\u003cdiv class=\"nznpd__qty\"\u003e1×\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eLJ12A3-4-Z\/BX sensor with attached cable\u003c\/strong\u003e\u003cp\u003eAbout 1 m of 3-core cable with bare ends, plus two M12 hex nuts and two star lock washers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\n\u003csection class=\"nznpd__block\"\u003e\n\u003ch3 class=\"nznpd__h\"\u003eGreat for\u003c\/h3\u003e\n\u003cdiv class=\"nznpd__uses\"\u003e\n\u003cdiv class=\"nznpd__use\"\u003eZ-axis or homing end stop on a CNC router or 3D printer\u003c\/div\u003e\n\u003cdiv class=\"nznpd__use\"\u003eCounting steel bolts or gear teeth going past\u003c\/div\u003e\n\u003cdiv class=\"nznpd__use\"\u003eDetecting a gate, arm or carriage at the end of travel\u003c\/div\u003e\n\u003cdiv class=\"nznpd__use\"\u003eFeeding a sinking (NPN) PLC input\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\n\u003csection class=\"nznpd__block\"\u003e\n\u003cdiv class=\"nznpd__qs\"\u003e\n\u003ch3\u003eWiring \u0026amp; getting started\u003c\/h3\u003e\n\u003col class=\"nznpd__steps\"\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003ePower it from 6 to 36 V DC\u003c\/strong\u003e\u003cp\u003eBrown to +V and blue to 0 V. A 12 V or 24 V supply is the usual choice.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eConnect the load to +V\u003c\/strong\u003e\u003cp\u003eWire a relay coil, lamp or PLC input between the black wire and +V. When steel comes within about 4 mm, the black wire is pulled to 0 V and the load switches on.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eReading it with Arduino, ESP32 or a printer board\u003c\/strong\u003e\u003cp\u003eDo not wire the black lead straight to a 3.3 V or 5 V pin while the sensor runs from 12 or 24 V. Fit a signal diode in series (cathode to the black wire, the band end), enable the pin's pull-up, and join the board's GND to the blue wire. The pin reads LOW when metal is detected. An optocoupler input works too.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eMount it\u003c\/strong\u003e\u003cp\u003ePass the barrel through a 12.5 mm hole and clamp it with a nut and star washer on each side. Leave the blue cap clear of the bracket, then set the gap to your target within 0 to 3.6 mm.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\n\u003cp class=\"nznpd__note\"\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e Sensing range is quoted for mild steel. Aluminium, brass and stainless steel are detected at a shorter distance, and plastic, wood and glass are not detected at all.\u003c\/p\u003e\n\u003c\/div\u003e\n","brand":"LEFIRCKO","offers":[{"title":"Default Title","offer_id":67684747673696,"sku":"SEN-LJ12A3-4-NPN-NO","price":5.79,"currency_code":"NZD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0664\/6127\/0112\/files\/01-lj12a3-4-zbx-npn-proximity-sensor-kit-hero.png?v=1792636764","url":"https:\/\/www.nznelectronics.co.nz\/products\/lj12a3-4-zbx-inductive-proximity-sensor-npn-no","provider":"NZN Electronics","version":"1.0","type":"link"}