{"product_id":"sn12-04dna-10-30vdc-sodron-proximity-switch","title":"SN12-04DNA 10-30VDC SODRON Proximity Switch","description":"\u003c!-- SEO Introduction --\u003e\n\u003csection class=\"koeed-container\"\u003e\n  \u003ch2 style=\"color: #0056b3;\"\u003eSODRON SN12-04DNA High-Reliability Inductive Proximity Sensor\u003c\/h2\u003e\n  \u003cp\u003e\n    The \u003cstrong\u003eSODRON SN12-04DNA\u003c\/strong\u003e is a high-performance inductive proximity switch engineered for non-contact \n    detection of ferrous and non-ferrous metal objects. Operating on a wide \u003cstrong\u003e10-30VDC\u003c\/strong\u003e power range, \n    this sensor features an \u003cstrong\u003eNPN Normally Open (NO)\u003c\/strong\u003e logic output with a nominal sensing distance \n    of \u003cstrong\u003e4mm\u003c\/strong\u003e. Its rugged, vibration-resistant housing makes it an essential component for \n    automated assembly lines, CNC machinery positioning, and conveyor system limit control.\n  \u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eKeywords:\u003c\/strong\u003e SODRON Proximity Switch, SN12-04DNA Sensor, NPN NO Metal Detector, Inductive Limit Switch, 10-30VDC Proximity Switch.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003chr style=\"border: 0; border-top: 1px solid #eeeeee; margin: 20px 0;\"\u003e\n\n\u003c!-- Technical Specifications --\u003e\n\u003csection class=\"koeed-specs\"\u003e\n  \u003ch3 style=\"color: #0056b3;\"\u003eTechnical Specifications\u003c\/h3\u003e\n  \n  \u003cdiv style=\"overflow-x: auto;\"\u003e\n    \u003ctable style=\"width: 100%; border-collapse: collapse; text-align: left; font-size: 14px;\"\u003e\n      \u003cthead\u003e\n        \u003ctr style=\"background-color: #16c8c8; color: #ffffff;\"\u003e\n          \u003cth style=\"padding: 12px; border: 1px solid #eeeeee;\"\u003eParameter\u003c\/th\u003e\n          \u003cth style=\"padding: 12px; border: 1px solid #eeeeee;\"\u003eValue \/ Specification\u003c\/th\u003e\n        \u003c\/tr\u003e\n      \u003c\/thead\u003e\n      \u003ctbody\u003e\n        \u003ctr style=\"background-color: #f4fcfc;\"\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee; font-weight: bold;\"\u003eModel Number\u003c\/td\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003eSN12-04DNA\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background-color: #fafafa;\"\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee; font-weight: bold;\"\u003eSensor Type\u003c\/td\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003eInductive (Metal Only)\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background-color: #f4fcfc;\"\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee; font-weight: bold;\"\u003eRated Sensing Distance\u003c\/td\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003e4 mm\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background-color: #fafafa;\"\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee; font-weight: bold;\"\u003eInput Voltage\u003c\/td\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003e10 - 30V DC\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background-color: #f4fcfc;\"\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee; font-weight: bold;\"\u003eOutput Logic\u003c\/td\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003eNPN Normally Open (NO)\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background-color: #fafafa;\"\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee; font-weight: bold;\"\u003eCurrent Consumption\u003c\/td\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003e≤ 10mA\u003c\/td\u003e\n        \u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\u003c\/section\u003e\n\n\u003c!-- Application \u0026 Reliability --\u003e\n\u003csection class=\"koeed-application\" style=\"margin-top: 25px;\"\u003e\n  \u003ch3 style=\"color: #0056b3;\"\u003eIndustrial Application \u0026amp; Material Response\u003c\/h3\u003e\n  \u003cp\u003e\n    The SN12-04DNA utilizes high-frequency electromagnetic field technology to detect metal objects entering \n    the sensing zone. Its solid-state output ensures \u003cstrong\u003emillisecond response times\u003c\/strong\u003e and millions \n    of switching cycles without mechanical wear. Perfect for \u003cstrong\u003ePLC logic inputs\u003c\/strong\u003e in harsh \n    environments, the sensor is protected against polarity reversal and short-circuits. Note that while \n    calibrated for mild steel, detection of aluminum or copper requires closer mounting distances.\n  \u003c\/p\u003e\n\u003c\/section\u003e\n\n\u003c!-- Koeed B2B Tool: Correction \u0026 Logic Tool --\u003e\n\u003csection id=\"koeed-tool-section\" style=\"margin: 30px 0; padding: 25px; border: 2px solid #16c8c8; border-radius: 8px; background-color: #fff;\"\u003e\n  \u003ch3 style=\"text-align: center; color: #16c8c8; margin-top: 0;\"\u003eKoeed Interactive: Sensing Range \u0026amp; Logic Validator\u003c\/h3\u003e\n  \u003cp style=\"font-size: 13px; text-align: center; color: #666;\"\u003eCalculate the effective distance based on your target material and verify wiring logic.\u003c\/p\u003e\n  \n  \u003cdiv style=\"display: flex; flex-direction: column; gap: 15px; max-width: 450px; margin: 0 auto;\"\u003e\n    \u003cdiv\u003e\n      \u003clabel for=\"koeed-material\" style=\"display: block; margin-bottom: 5px; font-weight: bold;\"\u003eTarget Metal Material:\u003c\/label\u003e\n      \u003cselect id=\"koeed-material\" style=\"width: 100%; padding: 12px; border: 1px solid #ccc; border-radius: 4px;\" aria-label=\"Select material type\"\u003e\n        \u003coption value=\"1.0\"\u003eMild Steel (Standard)\u003c\/option\u003e\n        \u003coption value=\"0.85\"\u003eStainless Steel (304\/316)\u003c\/option\u003e\n        \u003coption value=\"0.45\"\u003eAluminum\u003c\/option\u003e\n        \u003coption value=\"0.40\"\u003eCopper \/ Brass\u003c\/option\u003e\n      \u003c\/select\u003e\n    \u003c\/div\u003e\n\n    \u003cbutton onclick=\"koeedCalcDistance()\" style=\"background-color: #16c8c8; color: white; border: none; padding: 14px; cursor: pointer; border-radius: 4px; font-weight: bold; font-size: 16px;\"\u003eCalculate Effective Range\u003c\/button\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv id=\"koeed-calc-result\" style=\"margin-top: 20px; padding: 15px; background: #f9f9f9; border-left: 4px solid #16c8c8; display: none;\"\u003e\u003c\/div\u003e\n\n  \u003cdiv style=\"margin-top: 20px; border-top: 1px solid #eee; padding-top: 15px;\"\u003e\n    \u003ch4 style=\"margin: 0 0 10px 0; font-size: 14px;\"\u003eNPN NO Wiring Reference:\u003c\/h4\u003e\n    \u003cdiv style=\"display: flex; flex-wrap: wrap; gap: 10px; font-size: 12px;\"\u003e\n      \u003cdiv style=\"padding: 8px; border: 1px solid #eee;\"\u003e\n\u003cstrong\u003eBrown:\u003c\/strong\u003e + (10-30VDC)\u003c\/div\u003e\n      \u003cdiv style=\"padding: 8px; border: 1px solid #eee;\"\u003e\n\u003cstrong\u003eBlue:\u003c\/strong\u003e - (GND)\u003c\/div\u003e\n      \u003cdiv style=\"padding: 8px; border: 1px solid #eee;\"\u003e\n\u003cstrong\u003eBlack:\u003c\/strong\u003e Load (to Negative)\u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cnoscript\u003e\n    \u003cp\u003eManual Check: Nominal distance 4mm. Multiply by 1.0 for Steel, 0.45 for Aluminum. Ensure NPN logic (Sinking) is compatible with your PLC input card.\u003c\/p\u003e\n  \u003c\/noscript\u003e\n\u003c\/section\u003e\n\n\u003c!-- Troubleshooting FAQ --\u003e\n\u003csection class=\"koeed-faq\"\u003e\n  \u003ch3 style=\"color: #0056b3;\"\u003eField Troubleshooting FAQ\u003c\/h3\u003e\n  \u003cdiv style=\"margin-bottom: 15px;\"\u003e\n    \u003cp\u003e\u003cstrong\u003eQ1: The LED indicator is ON, but the PLC does not receive a signal.\u003c\/strong\u003e\u003cbr\u003e\n    \u003cem\u003eA:\u003c\/em\u003e This is likely a \u003cstrong\u003eLogic Mismatch\u003c\/strong\u003e. The SN12-04DNA is NPN (Sinking). Ensure your PLC input is configured for Source (Common Positive). If you need PNP, you must replace the unit with a SN12-04DPA.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"margin-bottom: 15px;\"\u003e\n    \u003cp\u003e\u003cstrong\u003eQ2: The sensor triggers erratically or distance seems very short.\u003c\/strong\u003e\u003cbr\u003e\n    \u003cem\u003eA:\u003c\/em\u003e Check the target material. Non-ferrous metals like aluminum reduce the range by over 50%. Use the Koeed calculator above to verify if your installation distance (Sn) is within the effective range for your specific material.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"margin-bottom: 15px;\"\u003e\n    \u003cp\u003e\u003cstrong\u003eQ3: The sensor stays ON even when no target is present.\u003c\/strong\u003e\u003cbr\u003e\n    \u003cem\u003eA:\u003c\/em\u003e Verify if the sensor is \"Flush\" or \"Non-flush\" type. If you are mounting a Non-flush sensor into a metal plate, the surrounding metal will cause a continuous trigger. Ensure at least 3x the diameter of free space around the sensing head.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/section\u003e\n\n\u003c!-- JavaScript Logic --\u003e\n\u003cscript\u003e\nfunction koeedCalcDistance() {\n  const factor = parseFloat(document.getElementById('koeed-material').value);\n  const nominal = 4.0;\n  const effective = (nominal * factor).toFixed(2);\n  const safe = (effective * 0.8).toFixed(2);\n  \n  const resultDiv = document.getElementById('koeed-calc-result');\n  resultDiv.style.display = 'block';\n  \n  resultDiv.innerHTML = `\n    \u003cdiv style=\"font-weight: bold; color: #0056b3; margin-bottom: 8px;\"\u003eDetection Report:\u003c\/div\u003e\n    \u003cul style=\"margin: 0; padding-left: 20px; font-size: 14px; line-height: 1.6;\"\u003e\n      \u003cli\u003eCalculated Effective Distance: \u003cstrong\u003e${effective} mm\u003c\/strong\u003e\u003c\/li\u003e\n      \u003cli\u003eRecommended Working Distance (Safe): \u003cstrong\u003e${safe} mm\u003c\/strong\u003e\u003c\/li\u003e\n    \u003c\/ul\u003e\n    \u003cp style=\"font-size: 12px; color: #d9534f; margin-top: 10px;\"\u003e\u003cem\u003e*Safety Note: In industrial vibration environments, use 80% of the effective distance for maximum reliability.\u003c\/em\u003e\u003c\/p\u003e\n  `;\n}\n\u003c\/script\u003e\n\n\u003c!-- Structured Data --\u003e\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How to wire the SODRON SN12-04DNA sensor?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Connect the Brown wire to Positive (10-30VDC), the Blue wire to Negative (GND), and the Black wire to the PLC input (NPN sinking logic).\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Why is the sensing distance lower than 4mm for aluminum?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Inductive sensors are calibrated for mild steel. Aluminum has a lower magnetic permeability, requiring a reduction factor of approximately 0.45, resulting in an effective distance of ~1.8mm.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between NPN and PNP proximity switches?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"NPN sensors pull the output to Ground (Sinking), while PNP sensors pull the output to VCC (Sourcing). The SN12-04DNA is an NPN unit.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"WebApplication\",\n  \"name\": \"Koeed Sensor Precision \u0026 Material Correction Tool\",\n  \"operatingSystem\": \"All\",\n  \"applicationCategory\": \"IndustrialEngineeringTool\",\n  \"description\": \"Calculates the effective sensing distance for inductive proximity switches based on different metal types.\"\n}\n\u003c\/script\u003e","brand":"KOEED","offers":[{"title":"Default Title","offer_id":44789060337849,"sku":"404898489035","price":22.21,"currency_code":"USD","in_stock":true}],"url":"https:\/\/koeed.com\/products\/sn12-04dna-10-30vdc-sodron-proximity-switch","provider":"KOEED","version":"1.0","type":"link"}