{"product_id":"lj12a3-2-z-bx-proximity-sensor-npn-no-3-wire","title":"LJ12A3-2-Z\/BX Inductive Proximity Sensor – NPN NO 12mm IP65 3-Wire","description":"\u003cstyle\u003e\n  @import url('https:\/\/fonts.googleapis.com\/css2?family=DM+Sans:wght@400;500;600;700\u0026display=swap');\n  .nzn-desc .tagline{font-family:'DM Sans',sans-serif;font-size:17px;line-height:1.7;color:#333;border-left:3px solid #e07e2c;padding-left:16px;margin-bottom:32px}\n  .nzn-desc .section-title{font-family:'DM Sans',sans-serif;font-size:15px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:#e07e2c;margin-bottom:14px}\n  .nzn-desc .specs-table{width:100%;border-collapse:collapse;margin-bottom:32px;font-family:'DM Sans',sans-serif;font-size:14px}\n  .nzn-desc .specs-table tr{border-bottom:1px solid #ebebeb}\n  .nzn-desc .specs-table tr:last-child{border-bottom:none}\n  .nzn-desc .specs-table td{padding:10px 8px}\n  .nzn-desc .specs-table td:first-child{color:#888;width:42%;font-size:14px}\n  .nzn-desc .specs-table td:last-child{font-weight:600;color:#1a1a1a}\n  .nzn-desc .uses-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-bottom:32px}\n  .nzn-desc .use-item{background:#f7f7f7;border-left:3px solid #e07e2c;padding:12px 14px;font-family:'DM Sans',sans-serif;font-size:13.5px;line-height:1.5;color:#2a2a2a}\n  .nzn-desc .note{background:#fafafa;border:1px solid #e8e8e8;border-radius:4px;padding:14px 16px;font-family:'DM Sans',sans-serif;font-size:13px;color:#888;line-height:1.6}\n  .nzn-desc .note strong{color:#555}\n  .nzn-desc .setup-box{background:#f0f7ff;border-left:3px solid #4a90d9;padding:14px 16px;font-family:'DM Sans',sans-serif;font-size:13px;color:#2c4a6e;line-height:1.7;margin-bottom:32px;border-radius:0 4px 4px 0}\n  .nzn-desc .faq-item{margin-bottom:12px}\n  .nzn-desc .faq-q{font-family:'DM Sans',sans-serif;font-size:13.5px;font-weight:700;color:#1a1a1a;margin-bottom:3px}\n  .nzn-desc .faq-a{font-family:'DM Sans',sans-serif;font-size:13.5px;color:#555;line-height:1.5;padding-left:14px;border-left:2px solid #e07e2c}\n  .nzn-desc hr.divider{border:none;border-top:1px solid #ebebeb;margin:28px 0}\n\u003c\/style\u003e\n\u003cdiv class=\"nzn-desc\" style=\"max-width:1200px;margin:0 auto;\"\u003e\n  \u003cp class=\"tagline\"\u003e12mm cylindrical inductive proximity sensor with NPN normally-open output and IP65 weather resistance. Detects ferrous and non-ferrous metals within 2mm without physical contact. 6–36V DC, 500Hz switching frequency. Standard for CNC homing, 3D printer bed levelling, conveyor systems, and robotics. Includes clamp nuts and washers.\u003c\/p\u003e\n  \u003chr class=\"divider\"\u003e\n  \u003cp class=\"section-title\"\u003eSpecifications\u003c\/p\u003e\n  \u003ctable class=\"specs-table\"\u003e\n    \u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eLJ12A3-2-Z\/BX\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eBody Diameter\u003c\/td\u003e\n\u003ctd\u003eM12 (12mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eBody Length\u003c\/td\u003e\n\u003ctd\u003e~64mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSensing Distance\u003c\/td\u003e\n\u003ctd\u003e2mm (±10%)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eOutput Type\u003c\/td\u003e\n\u003ctd\u003eNPN, Normally Open (NO)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSupply Voltage\u003c\/td\u003e\n\u003ctd\u003e6–36V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eOutput Current\u003c\/td\u003e\n\u003ctd\u003e≤300mA (sink)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSwitching Frequency\u003c\/td\u003e\n\u003ctd\u003e500Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCable Length\u003c\/td\u003e\n\u003ctd\u003e~100cm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eIP Rating\u003c\/td\u003e\n\u003ctd\u003eIP65\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eHousing Material\u003c\/td\u003e\n\u003ctd\u003eNickel-plated brass\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTarget Material\u003c\/td\u003e\n\u003ctd\u003eFerrous \u0026amp; non-ferrous metals\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/table\u003e\n  \u003chr class=\"divider\"\u003e\n  \u003cp class=\"section-title\"\u003eWiring — 3-Wire NPN\u003c\/p\u003e\n  \u003ctable class=\"specs-table\"\u003e\n    \u003ctr\u003e\n\u003ctd\u003eBrown wire\u003c\/td\u003e\n\u003ctd\u003eVCC — connect to positive supply (6–36V DC)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eBlue wire\u003c\/td\u003e\n\u003ctd\u003eGND — connect to negative \/ ground of supply\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eBlack wire\u003c\/td\u003e\n\u003ctd\u003eSignal output — pulls LOW when metal detected (NPN open collector). Connect to your input pin with a 10kΩ pull-up to VCC.\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/table\u003e\n  \u003cdiv class=\"setup-box\"\u003e\n    \u003cstrong\u003eUsing with Arduino (5V):\u003c\/strong\u003e Power the sensor from the Arduino 5V pin (minimum operating voltage). Connect Brown → 5V, Blue → GND, Black → digital input pin. Add a 10kΩ resistor from the input pin to 5V as a pull-up. The pin reads HIGH when no metal, LOW when metal is detected.\u003cbr\u003e\u003cbr\u003e\n    \u003cstrong\u003eUsing with 12V\/24V PLC or system:\u003c\/strong\u003e Power from your 12V\/24V supply. Use a voltage divider or logic level converter on the black signal wire before connecting to a 5V or 3.3V microcontroller input.\n  \u003c\/div\u003e\n  \u003chr class=\"divider\"\u003e\n  \u003cp class=\"section-title\"\u003eWhat's Included\u003c\/p\u003e\n  \u003ctable class=\"specs-table\"\u003e\n    \u003ctr\u003e\n\u003ctd\u003e1 ×\u003c\/td\u003e\n\u003ctd\u003eLJ12A3-2-Z\/BX inductive proximity sensor with ~100cm cable\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e2 ×\u003c\/td\u003e\n\u003ctd\u003eClamp nuts\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e2 ×\u003c\/td\u003e\n\u003ctd\u003eLock washers\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/table\u003e\n  \u003chr class=\"divider\"\u003e\n  \u003cp class=\"section-title\"\u003eCommon Uses\u003c\/p\u003e\n  \u003cdiv class=\"uses-grid\"\u003e\n    \u003cdiv class=\"use-item\"\u003eCNC machine homing, end-stops \u0026amp; limit switch replacement\u003c\/div\u003e\n    \u003cdiv class=\"use-item\"\u003e3D printer bed levelling \u0026amp; axis limit detection\u003c\/div\u003e\n    \u003cdiv class=\"use-item\"\u003eConveyor belt object counting \u0026amp; position sensing\u003c\/div\u003e\n    \u003cdiv class=\"use-item\"\u003eRobotic arm \u0026amp; actuator position feedback\u003c\/div\u003e\n    \u003cdiv class=\"use-item\"\u003eIndustrial metal part presence\/absence detection\u003c\/div\u003e\n    \u003cdiv class=\"use-item\"\u003eDIY automation \u0026amp; maker projects\u003c\/div\u003e\n  \u003c\/div\u003e\n  \u003chr class=\"divider\"\u003e\n  \u003cp class=\"section-title\"\u003eCommon Questions\u003c\/p\u003e\n  \u003cdiv class=\"faq-item\"\u003e\n    \u003cdiv class=\"faq-q\"\u003eWill this detect aluminium or copper?\u003c\/div\u003e\n    \u003cdiv class=\"faq-a\"\u003eYes, but at a reduced sensing distance — typically 40–50% of the rated 2mm. So expect reliable detection at ~1mm for non-ferrous metals. For iron\/steel, the full 2mm range applies.\u003c\/div\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"faq-item\"\u003e\n    \u003cdiv class=\"faq-q\"\u003eCan I use this as a filament runout sensor on my 3D printer?\u003c\/div\u003e\n    \u003cdiv class=\"faq-a\"\u003eNot directly — it detects metals only, not plastic filament. It's ideal for axis limit switches and bed levelling probes on metal print beds, but not for filament runout detection.\u003c\/div\u003e\n  \u003c\/div\u003e\n  \u003chr class=\"divider\"\u003e\n  \u003cp class=\"note\"\u003e\u003cstrong\u003ePlease note:\u003c\/strong\u003e Detects metal only. Non-ferrous metals have ~40–50% reduced effective sensing range. Do not exceed 36V supply voltage. Includes 2 clamp nuts and 2 lock washers.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"NZN Electronics","offers":[{"title":"Default Title","offer_id":42680889868384,"sku":"SEN-LJ12A3-NPN-NO","price":8.99,"currency_code":"NZD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0664\/6127\/0112\/files\/main-hero-lj12a3-2-zbx-orange.png?v=1777361426","url":"https:\/\/www.nznelectronics.co.nz\/products\/lj12a3-2-z-bx-proximity-sensor-npn-no-3-wire","provider":"NZN Electronics","version":"1.0","type":"link"}