{"product_id":"honeywell-fs20x-211-21-2-multi-spectrum-fire-detection-sensor","title":"Honeywell FS20X-211-21-2 Multi-Spectrum Fire Detection Sensor","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003e\u003cspan style=\"color: #008000;\"\u003eHoneywell FS20X-211-21-2\u003c\/span\u003e\u003c\/strong\u003e is a multi-spectrum UV\/Dual IR\/VIS flame detector. It belongs to the \u003cstrong\u003eFS20X Flame Sentry Series\u003c\/strong\u003e. This detector combines multiple optical sensing technologies for reliable fire detection in industrial environments.\u003c\/p\u003e\n\u003cp\u003eIts sensor array monitors ultraviolet, infrared, and visible radiation. The system analyzes different spectral bands to identify flame signatures. This approach helps distinguish actual fires from common environmental interference.\u003c\/p\u003e\n\u003cp\u003eThe UV channel provides solar-blind detection. WideBand IR, Near-Band IR, and visible sensors add spectral information. Together, these channels support rapid flame recognition and improved false alarm rejection.\u003c\/p\u003e\n\u003cp\u003eThe detector provides a \u003cstrong\u003e90-degree field of view\u003c\/strong\u003e. It can detect a 1-square-foot heptane reference fire beyond 200 feet (60 meters). Actual detection performance depends on fire type, installation conditions, and environmental factors.\u003c\/p\u003e\n\u003cp\u003eBuilt-in RS-485 Modbus, FireBus II support, and a 4–20 mA output simplify system integration. Multiple relay outputs support fire alarm, fault, and verification functions.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eTechnical Specifications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eHoneywell\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e\u003cspan style=\"color: #008000;\"\u003eFS20X-211-21-2\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProduct Series\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFS20X Flame Sentry Series\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProduct Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMulti-Spectrum UV\/Dual IR\/VIS Flame Detector\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDetection Technology\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUV, WideBand IR, Near-Band IR, and Visible sensors\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eUV Spectral Band\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.18–0.26 μm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eVisible Spectral Band\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.4–0.7 μm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInfrared Spectral Band\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.7–3.5 μm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eField of View\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e90-degree solar-blind field of view\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eReference Fire Detection Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eOver 200 ft (60 m) for a 1 ft² (0.1 m²) heptane fire\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOperating Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e18–32 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNominal Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e24 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAnalog Output\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e4–20 mA, sink or source configuration\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDigital Communication\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eRS-485 Modbus\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNetwork Support\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFireBus II\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRelay Outputs\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAlarm, fault, and verification relays\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eEnclosure Material\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCopper-free aluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eConduit Entries\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eTwo 3\/4-inch NPT entries\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eElectrical Supply\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e18–32 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFM Approval\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eClass I, Division 1, Groups A–D; Class II, Division 1, Groups E–G; Class III\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOther Certifications\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ecFM, ATEX, and IECEx compliance\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003e\u003cstrong\u003eKey Technical Features\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMulti-Spectrum Detection:\u003c\/strong\u003e Combines UV, dual IR, and visible sensing channels.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSolar-Blind UV Channel:\u003c\/strong\u003e Monitors ultraviolet radiation within the 0.18–0.26 μm band.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtended Detection Distance:\u003c\/strong\u003e Detects the specified heptane reference fire beyond 60 meters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide Coverage:\u003c\/strong\u003e Provides a nominal 90-degree field of view.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexible Signal Interfaces:\u003c\/strong\u003e Supports 4–20 mA and RS-485 Modbus communication.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRelay Integration:\u003c\/strong\u003e Provides alarm, fault, and verification relay functions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndustrial Enclosure:\u003c\/strong\u003e Uses copper-free aluminum construction for industrial installations.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eInstallation Guidelines\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eCorrect positioning directly affects flame detection performance. Follow these installation practices:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting Position:\u003c\/strong\u003e Install the detector with a clear view of the protected hazard area.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDetection Coverage:\u003c\/strong\u003e Consider the 90-degree field of view when calculating detector spacing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eObstruction Control:\u003c\/strong\u003e Avoid structural objects that block the optical sensing path.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting Direction:\u003c\/strong\u003e Follow the manufacturer's specified orientation and mounting instructions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eElectrical Supply:\u003c\/strong\u003e Provide a regulated 18–32 VDC supply.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCable Routing:\u003c\/strong\u003e Separate signal wiring from high-voltage and high-interference circuits.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConduit Connection:\u003c\/strong\u003e Use the two 3\/4-inch NPT entries with suitable approved fittings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGrounding:\u003c\/strong\u003e Follow the manufacturer's grounding and bonding requirements.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eVerify hazardous-area requirements before installation. Confirm enclosure protection, conduit fittings, and cable entries against the applicable certification.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eCommissioning and Maintenance\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eCommissioning should verify the complete detection and alarm signal chain.\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003eCheck the supply voltage at the detector terminals.\u003c\/li\u003e\n\u003cli\u003eInspect conduit connections, grounding, and cable terminations.\u003c\/li\u003e\n\u003cli\u003eConfirm the configured 4–20 mA output mode.\u003c\/li\u003e\n\u003cli\u003eVerify RS-485 Modbus communication with the control system.\u003c\/li\u003e\n\u003cli\u003eCheck alarm, fault, and verification relay operations.\u003c\/li\u003e\n\u003cli\u003ePerform the manufacturer's approved functional test.\u003c\/li\u003e\n\u003cli\u003eConfirm alarm transmission at the fire and gas control panel.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003eDuring routine maintenance, inspect the optical window for dust, oil, and other contamination. Clean the window according to Honeywell's instructions. Check mounting stability and cable integrity.\u003c\/p\u003e\n\u003cp\u003eUse an approved flame simulator or test equipment for functional verification. Never use an uncontrolled open flame during routine testing. Record test results and maintenance activities.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eCompatibility and System Integration\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003e\u003cspan style=\"color: #008000;\"\u003eFS20X-211-21-2\u003c\/span\u003e\u003c\/strong\u003e provides several interfaces for industrial fire and gas systems.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDCS and PLC Systems:\u003c\/strong\u003e The 4–20 mA output supports analog input integration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFire and Gas Panels:\u003c\/strong\u003e Alarm and fault relays support discrete signal monitoring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModbus Networks:\u003c\/strong\u003e RS-485 Modbus supports digital communication with compatible controllers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFireBus II Networks:\u003c\/strong\u003e Supports compatible FireBus II system configurations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndustrial Power Systems:\u003c\/strong\u003e Requires an 18–32 VDC supply.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCheck the controller's communication protocol and input requirements before integration. Confirm Modbus addressing, wiring topology, and communication settings. Verify relay contact ratings and analog output loading against the official technical documentation.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eApplications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOil and Gas:\u003c\/strong\u003e Monitors pump areas, processing units, and hydrocarbon handling facilities.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePetrochemical Plants:\u003c\/strong\u003e Provides flame detection around process equipment and storage areas.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Generation:\u003c\/strong\u003e Supports fire monitoring in designated equipment areas.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChemical Processing:\u003c\/strong\u003e Monitors hazardous production zones and process installations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndustrial Storage:\u003c\/strong\u003e Protects suitable fuel handling and combustible material storage areas.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eEnvironmental and Interference Considerations\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe multi-spectrum sensor architecture evaluates several optical bands. This helps improve discrimination between flame signals and environmental radiation.\u003c\/p\u003e\n\u003cp\u003eHowever, installation conditions still influence detection performance. Consider the following factors:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDirect sunlight and intense artificial lighting.\u003c\/li\u003e\n\u003cli\u003eDust, smoke, oil deposits, and optical window contamination.\u003c\/li\u003e\n\u003cli\u003eSteam, water spray, and other visibility obstructions.\u003c\/li\u003e\n\u003cli\u003eMechanical vibration and mounting movement.\u003c\/li\u003e\n\u003cli\u003eElectromagnetic interference from nearby power equipment.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eUse suitable cable shielding, grounding, and routing practices. Confirm the detector's certified environmental limits before selecting it for severe operating conditions.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eCertifications and Hazardous-Area Approvals\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe supplied specifications identify the following approvals and compliance information:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFM:\u003c\/strong\u003e Class I, Division 1, Groups A–D.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFM:\u003c\/strong\u003e Class II, Division 1, Groups E–G.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFM:\u003c\/strong\u003e Class III.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ecFM:\u003c\/strong\u003e Canadian certification identification.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eATEX:\u003c\/strong\u003e European hazardous-area compliance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIECEx:\u003c\/strong\u003e International explosive-atmosphere equipment certification.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eAlways verify the exact certificate number, protection marking, gas group, temperature class, and ambient limits. Confirm that the approval applies to the complete \u003cstrong\u003eFS20X-211-21-2\u003c\/strong\u003e configuration.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003ePackage Contents\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1 × Honeywell FS20X-211-21-2 Flame Detector\u003c\/li\u003e\n\u003cli\u003eStandard product identification and configuration labels, where supplied\u003c\/li\u003e\n\u003cli\u003eManufacturer documentation, where included with the shipment\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eMounting brackets, cables, conduit fittings, and commissioning tools are not assumed to be included. Please confirm the required accessories when placing your order.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions (FAQ)\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ1: What detection technologies does the FS20X-211-21-2 use?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe detector combines UV, WideBand IR, Near-Band IR, and visible sensing channels. This multi-spectrum architecture evaluates different optical signatures for flame recognition.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ2: What is the maximum detection distance?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe specified detection range exceeds 200 feet (60 meters). This figure applies to a 1-square-foot heptane reference fire. Other fuels and installation conditions can produce different detection distances.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ3: Can this detector connect directly to a PLC or DCS?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. Its 4–20 mA output supports compatible analog input channels. RS-485 Modbus provides another integration option. Check electrical loading and communication settings before commissioning.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ4: What should engineers check when the detector reports a fault?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eStart by checking the 18–32 VDC supply and field wiring. Inspect the optical window for contamination. Then review the fault relay and communication status. Use the manufacturer's diagnostic procedure to identify the actual fault.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ5: How should engineers position multiple detectors?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eCalculate coverage using the 90-degree field of view and actual hazard geometry. Consider obstructions, mounting height, and expected fire locations. Do not calculate spacing from detection distance alone. Conduct a site-specific coverage assessment.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ6: Does a 4–20 mA connection provide the same information as Modbus?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNot necessarily. The analog output provides a current signal according to its configured operation. Modbus provides digital communication. Review the manufacturer's interface documentation before deciding which signals your control system requires.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ7: What should buyers confirm before ordering?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eCheck the complete model number, supply voltage, communication requirements, and output configuration. Confirm hazardous-area certification and conduit thread compatibility. Also verify mounting accessories and the required documentation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ8: Can the FS20X-211-21-2 replace another FS20X detector directly?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNot automatically. Similar model names do not guarantee identical electrical or mechanical configurations. Compare sensing technology, output interfaces, enclosure specifications, approvals, and mounting requirements before replacement.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ9: How often should engineers inspect the detector?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eFollow the site fire protection maintenance schedule and Honeywell's recommendations. Inspection frequency depends on contamination, operating conditions, and applicable safety requirements. Increase inspection attention in dusty or oily environments.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ10: What information helps suppliers confirm the correct model?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eProvide the complete part number, equipment application, required communication interface, and hazardous-area classification. Photos of the nameplate can also help confirm the configuration.\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e","brand":"Honeywell","offers":[{"title":"Default Title","offer_id":68045556940982,"sku":"FS20X-211-21-2","price":152.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0722\/7863\/8774\/files\/FS20X-211-21-2-3.jpg?v=1794452515","url":"https:\/\/www.plcsparehub.com\/products\/honeywell-fs20x-211-21-2-multi-spectrum-fire-detection-sensor","provider":"Global PLC Spare Hub","version":"1.0","type":"link"}