{"product_id":"photoelectric-beam-sensor-security-alarm-single-double-beam","title":"Photoelectric Beam Sensor Security Alarm | Single \u0026 Double Beam","description":"\n\u003ch2\u003ePhotoelectric Beam Sensor Security Alarm – Single \u0026amp; Double Beam Detector\u003c\/h2\u003e\n\u003cp\u003eUpgrade your property's perimeter security with the LIHTNE Model 218D Photoelectric Beam Sensor. Designed for automatic doors, entryways, driveways, and commercial access points, this versatile detector delivers reliable intrusion detection using infrared beam technology — available in both single-beam and double-beam configurations to suit your specific security needs.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eMade in Mainland China.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEasy Wiring:\u003c\/strong\u003e Pull-in \u0026amp; pull-out type socket design makes installation straightforward — no specialist tools required.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMicrocomputer Control Technology:\u003c\/strong\u003e High integration and stability for dependable, long-term operation.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePrecision Optical Lens:\u003c\/strong\u003e International-standard lens design with excellent focus quality and a well-controlled detection angle for accurate beam alignment.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLong Transmission Range:\u003c\/strong\u003e Up to 10 metres (approx. 33 ft) maximum transmit distance with strong anti-interference capability.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGerman-Technology Filter System:\u003c\/strong\u003e Receiving filter, decoding, and amplification system effectively eliminates interference from natural daylight and ambient light sources.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLow-Power Emission Design:\u003c\/strong\u003e Energy-efficient infrared emitter extends device lifespan while maintaining maximum range.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlexible Contact Output:\u003c\/strong\u003e Selectable NO (Normally Open) or NC (Normally Closed) relay contact — adapt the sensor to your existing alarm or access control system.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Voltage Input:\u003c\/strong\u003e Accepts AC\/DC 12–36V, compatible with most standard security and automation power supplies.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBuilt-in Fault Warning:\u003c\/strong\u003e The sensor automatically triggers a warning alarm if it detects an issue with the eye sensor, so you're always informed of your system's status.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShielded Signal Lines:\u003c\/strong\u003e Emission and receive contacts are output separately with shielding line for clean, noise-free signal transmission.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable style=\"width:100%; border-collapse:collapse;\"\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003ePower Supply\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eAC\/DC 12–36V\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eStatic Power\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e12–18 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eAction Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e12–58 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eMax Transmit Distance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e10 m (approx. 33 ft)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eBeam Configuration\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eSingle Beam \/ Double Beam (selectable)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eContact Output\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eNO \/ NC (selectable)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eWorking Temperature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e-42°C to 45°C\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eWorking Humidity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e10–90% RH\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eController Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e105.5L × 53.4W × 28.5H mm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eMagic Eye Head Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e19L × 13D mm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e218D\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eLIHTNE\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eCountry of Origin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eMainland China\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCommon Applications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eAutomatic sliding and swing doors\u003c\/li\u003e\n  \u003cli\u003eDriveway and gate access control\u003c\/li\u003e\n  \u003cli\u003eWarehouse and industrial entry detection\u003c\/li\u003e\n  \u003cli\u003eHome and commercial perimeter security systems\u003c\/li\u003e\n  \u003cli\u003eRetail storefront entry counters\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eFor guidance on home and business security best practices, visit the U.S. Consumer Product Safety Commission (CPSC) for product safety standards and consumer resources.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What is the difference between single beam and double beam mode on this photoelectric sensor?\u003c\/h4\u003e\n\u003cp\u003eA: In single beam mode, one infrared beam is transmitted between the emitter and receiver — interrupting this single beam triggers the alarm output. Double beam mode uses two beams simultaneously, which reduces false triggers from small objects like insects or blowing debris, making it ideal for outdoor or higher-security installations where reliability is critical.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Is this photoelectric beam sensor compatible with my existing alarm or access control system?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. The Model 218D features a selectable NO (Normally Open) or NC (Normally Closed) relay contact output, making it compatible with the vast majority of standard security alarm panels, automatic door controllers, and access control systems. It also accepts a wide AC\/DC 12–36V power input, working with most common power supplies.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Can this sensor be used outdoors?\u003c\/h4\u003e\n\u003cp\u003eA: The LIHTNE 218D is engineered with a German-technology daylight-interference filter system, allowing it to function reliably in environments with varying ambient and natural light. Its wide operating temperature range of -42°C to 45°C also makes it suitable for use in a broad range of climates. Please ensure appropriate weatherproofing of wiring connections for fully exposed outdoor installations.\u003c\/p\u003e\n\n\u003ch4\u003eQ: How difficult is it to install this photoelectric beam detector?\u003c\/h4\u003e\n\u003cp\u003eA: Installation is designed to be straightforward thanks to the pull-in \u0026amp; pull-out type socket for easy wiring. The precision optical lens with a controlled beam angle makes alignment simple. Most users with basic DIY or electrical knowledge can complete the installation without specialist assistance.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What is the difference between single beam and double beam mode on this photoelectric sensor?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"In single beam mode, one infrared beam is transmitted between the emitter and receiver — interrupting this single beam triggers the alarm output. 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