Fireye 95UVS2-1CG​ – 10 ft Captive Cable Variant | Fireye 95UVS2-1CEX​ – Explosion-Proof ATEX Version

Technical Specifications

Main Features and Advantages

Integrated intelligence eliminates external amplifiers. The 95UVS2-1​ incorporates the UV sensor, microprocessor, signal conditioning, flame relay, fault relay, and 4-20 mA transmitter within a single sealed housing — removing the remote flame amplifier cabinets that occupied valuable panel space and introduced additional failure points in legacy burner management systems. This integration reduces wiring complexity, shrinks the control panel footprint, and improves mean time between failures (MTBF) by consolidating all critical flame detection electronics into one environmentally protected enclosure mounted directly at the sight pipe.Model Insight algorithm with AutoTune delivers unmatched flame discrimination. The 95UVS2-1​ continuously measures the modulation amplitude (flicker) of the target flame, automatically selecting the optimal frequency from 21 available choices and storing the best ON/OFF thresholds during the commissioning AutoTune procedure. This intelligent learning capability enables the scanner to distinguish genuine flame UV emission from background radiation produced by hot furnace walls, glowing carbon particles, or electric welding arcs — virtually eliminating false flame-loss trips and nuisance shutdowns that plague conventional fixed-threshold detectors. The Model Insight approach effectively creates a unique “fingerprint” of the target flame, filtering out all non-matching UV signatures.Four programmable memory files enable multi-fuel flexibility. The 95UVS2-1​ can store four complete sets of detection parameters — modulation frequency, sensor gain, and ON/OFF thresholds — allowing a single burner to operate optimally across different fuels (natural gas, propane, light oil #2) or firing rates (pilot / low fire / high fire / main flame) with a simple file selection. This capability is transformative for facilities that switch fuels seasonally or operate multi-stage combustion sequences, eliminating the need for manual recalibration at each transition and ensuring consistent flame detection performance regardless of operating mode.Full electronic self-checking enhances safety without mechanical wear. Unlike legacy scanners that relied on mechanical shutters to verify sensor functionality, the 95UVS2-1​ performs comprehensive electronic self-diagnosis covering the UV sensor, signal circuitry, microprocessor program, and output relays. The fault relay (SPST-NC) remains energized only while self-check passes and power is healthy — any internal anomaly results in immediate de-energization, triggering a safety alarm. This design eliminates moving parts in the diagnostic pathway, drastically improving long-term reliability while satisfying the most stringent flame safeguard safety integrity requirements.Rich local operator interface accelerates commissioning and diagnostics. The 95UVS2-1​ features an 8-character alphanumeric LED display and 4-button keypad directly on the scanner body, enabling technicians to view live flame signal strength, read fault codes, adjust thresholds, and select program files without laptop connectivity. During commissioning, the AutoTune procedure can be initiated with a single button press; during operation, the LED display provides real-time flame signal percentage, allowing operators to proactively identify signal degradation before it triggers a trip. This at-device intelligence drastically reduces mean time to repair (MTTR) and empowers field personnel with instant situational awareness.Industrial-grade environmental robustness ensures dependable operation. The 95UVS2-1​ achieves NEMA 4X / IP66 protection with a cast-aluminum housing and grey polyester powder coat finish, resisting corrosion, washdown, and outdoor exposure. Its -40°C to +65°C ambient operating range covers arctic installations and tropical furnace environments alike. The 3/8″ NPT/BSP purge air connection (accepting 4–15 SCFM of clean instrument air) keeps the viewing window free of soot and combustion deposits, extending maintenance intervals even in heavy-oil or coal-fired applications. The optional CEX explosion-proof variant (ATEX EExd IIC T6) extends deployment into Class I Division 1 hazardous areas, while the CG variant with 10 ft captive cable simplifies installation in tight conduit spaces.Drop-in compatibility preserves existing infrastructure investment. The 95UVS2-1​ maintains identical mechanical mounting dimensions and 12-pin electrical interface with legacy Fireye 45UVFS1, 45FES1, and 45RM4 scanners, enabling direct replacement without sight pipe modification, flange replacement, or control panel rewiring. Facilities can upgrade from obsolete flame detection technology to the modern InSight S2 platform while preserving their entire burner management system architecture, combustion safeguards logic, and operator training investment — a critical advantage given the multimillion-dollar cost of full burner management system replacement.

Application Field

The 95UVS2-1​ serves as the gold-standard UV flame scanner across the global combustion safety landscape, deployed in applications where flame presence verification is not merely operational but safety-critical. In fossil-fuel power generation, the 95UVS2-1​ monitors boiler burners, auxiliary firing systems, and duct burners within combined-cycle and coal-fired plants — where a false flame-loss trip can trigger a turbine emergency shutdown costing hundreds of thousands of dollars per event. The scanner’s Model Insight algorithm excels in these multi-burner environments, discriminating the target burner’s flame signature from adjacent burners’ UV emissions and furnace wall radiation. Its 4 programmable memory files enable seamless transitions between gas and oil firing modes without recalibration, while the 4-20 mA analog output feeds directly into the plant DCS for continuous flame signal trending and predictive maintenance.Petrochemical refineries, ethylene crackers, and chemical processing facilities rely on the 95UVS2-1​ for fired heaters, process furnaces, flares, and thermal oxidizers where flammable atmospheres demand the highest integrity flame detection. The scanner’s ATEX-certified CEX variant (95UVS2-1CEX) brings explosion-proof UV flame monitoring to Class I Division 1 hazardous areas, while the standard 95UVS2-1​ serves Division 2 zones and non-classified furnace enclosures. Refineries particularly value the scanner’s immunity to welding arc flash during turnaround activities — a common cause of spurious trips with conventional detectors — allowing maintenance welding to proceed safely near operating furnaces without sacrificing flame monitoring integrity.Industrial boiler plants across manufacturing, institutional, and commercial sectors deploy the 95UVS2-1​ for package boilers, water-tube boilers, and thermal fluid heaters burning natural gas, propane, or light oil. Compliance with NFPA 85 (boiler) and NFPA 86 (industrial furnace) standards makes the scanner the default choice for new installations and obsolescence-replacement projects alike. The AutoTune capability proves especially valuable in these applications where fuel composition can vary seasonally (e.g., natural gas with varying ethane content), automatically adapting detection parameters to maintain optimal flame discrimination without technician intervention.Gas turbine auxiliary combustion systems, incinerators, and thermal oxidizers represent additional critical strongholds for the 95UVS2-1. In waste-to-energy plants and hazardous waste incineration facilities, the scanner’s 15-meter detection range and 90° field of view accommodate the large flame envelopes characteristic of these applications, while its electronic self-checking ensures continuous flame monitoring even under extreme temperature and corrosive flue gas conditions. Glass manufacturing furnaces, ceramic kilns, and steel reheating furnaces utilize the 95UVS2-1‘s daylight-blind UV sensing to ignore the intense visible and infrared radiation emitted by molten glass and hot refractory, focusing exclusively on the UV signature of the actual flame.For plant engineers managing obsolescence of legacy Fireye 45-series flame scanners, the 95UVS2-1​ offers a strategic continuity pathway. By maintaining identical mechanical and electrical interfaces with 45UVFS1, 45FES1, and 45RM4 predecessors, the 95UVS2-1​ enables staged, low-risk migration from discontinued technology to the modern InSight S2 platform — one burner at a time, without system-wide shutdowns or control logic modifications. This drop-in compatibility, combined with the scanner’s 12-month operational reliability track record in the aftermarket, positions the 95UVS2-1​ as the definitive flame safety solution for extending the service life of heritage combustion assets while planning orderly evolution toward next-generation Fireye BurnerLogix platforms.