Product Core Brief

• Model: 95UVS2-1
• Brand: Fireye (Emerson Combustion Safety, InSight I Type 95 Series S2 enhanced UV flame scanner)
• Model Code Decode95 = InSight I integrated microprocessor flame scanner platformUV = Solid-state ultraviolet optical sensorS2 = Enhanced S2 version (4 flame signature memory files, remote file select, Modbus RTU communication; base S1 only 2 files, no Modbus)-1 = Standard straight sight tube configuration, 8-pin quick-disconnect socket, no factory captive cable (match cable 59-547 series separately)
• Core Function: SIL3 certified microprocessor UV flame monitor, dedicated for clean natural gas / propane burners; 295–320nm narrow UV band rejects furnace IR heat, visible light, sunlight interference. Stores 4 independent flame signature profiles for multi-load / dual-burner switching, auto flame learn, built-in flame & fault Form C relays, isolated 4–20mA flame strength output, Modbus RTU digital communication, full continuous electronic self-diagnosis without mechanical shutters. Fully compliant with NFPA, UL, FM, Exida SIL3, ATEX Ex d IIC T6 standards.
• Product Type: Complete scanner main body (cast aluminum NEMA4X housing, standard 295–320nm UV quartz lens, multi-line LCD display, membrane programming keypad, 3/8” purge air port, 8-pin QD quick-disconnect socket)
• Key Specs: 295–320nm narrow UV spectrum (gas-only); 24VDC power; S2 enhanced firmware with 4 flame memory files + remote select; Modbus RTU RS485; dual Form C flame/fault relays; isolated 4–20mA analog trending; auto flame threshold learn; full electronic self-check; IP66 / NEMA4X; Class I Div2 hazardous location rated.Note: Obsolete InSight I generation legacy model, stocked brand-new surplus; mounting flange and QD extension cable sold separately. Narrow UV optical design is not suitable for heavy fuel oil burners (select 85UVF1-1QDK3 K3 wide-spectrum model for HFO).

 

Key Technical Specifications

 

Optical & Flame Detection Performance

• Spectral response: 295–320nm narrow deep UV band, only reacts to gas combustion UV flicker; completely ignores furnace infrared radiant heat, workshop lighting, sunlight to eliminate false flame alarms
• Detection principle: Microprocessor analyzes flame flicker frequency/amplitude signature; one-touch auto-learn completes flame profile calibration in <60 seconds
• Applicable fuels: Natural gas, propane, methane, landfill gas, clean light distillate oil
• Flame loss response time (FFRT): Configurable 0.8–3 seconds
• Maximum effective sight distance: Up to 2.0m with clean lens and rated purge air flow
• Field of view: 90° conical wide viewing angle, targets flame root high-flicker zone
• S2 unique advantage: 4 independent flame signature storage files; external dry contact remote file switching for multi-stage burner load / dual burner systems

 

Electrical, Relay & Communication Outputs

• Supply voltage: 24VDC +10% / -15%, operating current 0.35A (8.5VA)
• Dual independent Form C SPDT dry relays (3A @ 30VDC resistive):
  1. Flame relay: Energized when valid calibrated flame signal detected (series interlock with fault relay internally for safety)
  2. Fault relay: Energized under healthy power & self-check pass; de-energized on hardware fault, lens blockage, sensor degradation, wiring open/short, power out-of-range
• Analog output: Galvanically isolated 4–20mA linear signal (4mA = no flame, 20mA = maximum flame intensity), max load 750Ω for DCS/PLC trending
• Digital communication (S2 exclusive): Modbus RTU RS485 multi-drop bus, upload flame strength, fault codes, runtime hours, flame signature parameters to SCADA
• Electrical interface: 8-pin QD quick-disconnect socket, matching Fireye cable series 59-547 (separate accessory)
• Local HMI: 8-character alphanumeric LCD display + membrane 4-button programming keypad; LED status indicators (Power / Flame / Fault / Comm)

 

Mechanical, Purge Air & Mounting

• Housing: Powder coated die-cast aluminum, IP66 / NEMA4X dust, water, oil splash resistant
• Purge air inlet: 3/8” NPT threaded port for lens cooling and anti-foulingStandard purge flow: 3–5 SCFM clean, oil-free, dry instrument air
• Sight pipe mounting flange kit sold separately (P/N 129-168-1 NPT / 129-168-2 BSP) with heat isolation spacer
• Overall dimensions: 232mm L × 114mm W × 92mm H
• Net weight: ~2.82kg
• Minimum sight pipe inner diameter ≥25mm, straight unobstructed line of sight to burner flame core

 

Environmental & Safety Certifications

• Continuous housing ambient operating temperature: -40°C ~ +65°C; internal PCB electronics max +82°C
• Storage temperature range: -40°C ~ +85°C
• Humidity tolerance: 0–95% RH non-condensing
• Vibration resistance: Continuous furnace vibration tolerant without signal drift or parameter shift
• Safety approvals: FM Class I Div2 Groups A/B/C/D; UL/cUL listed; CE; Exida SIL3 functional safety; ATEX Ex d IIC T6 certifiedFireye

 

Compatible System Architecture

1. Standalone burner control: Directly drive fuel safety shutoff valve via built-in flame relay hardwired interlock
2. PLC / DCS / SCADA integration: 4–20mA analog trending + fault relay digital alarm + Modbus digital data access
3. Cross-compatibility: Works with Fireye BurnerLogix, MicroM BMS and all third-party 24VDC burner PLC systems (open standard signals, no proprietary pulse protocols)

 

Product Introduction

Fireye 95UVS2-1 belongs to the first-generation InSight I S2 enhanced series integrated UV flame scanners, an upgrade over base S1 models with expanded memory and digital Modbus communication, designed for gas-fired industrial boilers, process heaters and clean light oil furnaces requiring SIL3 safety compliance.Core differentiation vs 85UVF Phoenix series: The 95 InSight platform adds multi-file flame profile storage and native Modbus RTU for plant SCADA digital data acquisition, making it preferred for large central control room DCS monitoring projects. The narrow 295–320nm deep UV optical filter is optimized for clean gas flames and rejects hot furnace background infrared interference far better than wide-spectrum K3 variants.S2 version exclusive functions: Four independent flame signature memory slots support automatic switching between low-fire / high-fire / pilot / dual-burner flame profiles via external dry contact remote file select wiring, eliminating repeated on-site re-calibration when burner load changes. Full electronic continuous self-diagnosis has no fragile mechanical self-test shutters found on old 45UV5 tube-type scanners, reducing mechanical maintenance failures.The -1 QD quick-disconnect design removes factory fixed captive cable; custom-length 59-547 QD extension cables are matched on-site. Cable damage only requires cable replacement without dismounting the scanner body from furnace sight pipes, cutting boiler shutdown maintenance duration.One-touch auto-learn simplifies commissioning: Ignite the burner, activate Learn mode, the scanner auto-samples flame flicker characteristics and locks flame ON/OFF trip thresholds without analog potentiometer adjustment. Dual redundant relay contacts provide hardwired flame failure safety interlock signals to fuel cut-off valves, fully complying with NFPA boiler combustion safety codes.Typical application scenarios: Natural gas auxiliary power plant boilers, chemical process gas heaters, food industry hot air ovens, textile thermal oil furnaces, clean-burning landfill gas incinerators, dual-stage low/high fire gas burners.

 

QA & Testing SOP

1. Incoming Inspection: Verify model marking 95UVS2-1 S2 QD socket intact; inspect UV quartz lens scratch-free, aluminum housing crack-free, LCD display clear, keypad responsive, LED indicators functional; confirm original factory datasheet 133-769 and anti-static packaging seal intact.
2. Bench Functional Test: Stabilized 24VDC power supply + matching 59-547 QD cable; simulate gas UV flame source, run 24-hour continuous operation test, validate 4-file flame memory storage, remote file select switching, auto-learn flame threshold, flame relay pull-in/drop-out, linear 4–20mA analog output, Modbus RTU data readback, fault relay trigger under simulated lens blockage / sensor fault.
3. Purge Air & Sealing Test: Supply standard 4SCFM dry purge air to inlet port, inspect housing sealing for air leakage; high/low temperature cycling test to eliminate lens fogging and signal drift.
4. Parameter Record Backup: Document 8-pin QD cable pin definition, Modbus wiring polarity, standard purge air flow/pressure, recommended sight pipe length range for field maintenance reference.
5. Final QC Packaging: Attach serialized printed test pass tag with flame response, self-diagnosis and Modbus communication test data; wrap scanner with shock-absorbing foam, seal in static shielding bag to protect UV optical lens during transit and warehouse storage.

 

Installation Pitfalls & 4-Step Replacement Guide

❗ Spectrum Fuel Matching Risk: 95UVS2-1 narrow 295–320nm UV filter only for clean gas / light oil; heavy fuel oil, residual oil burners cannot use this model—must select K3 wide-spectrum 85UVF1-1QDK3 variant instead, weak heavy-oil UV signal will cause constant flame loss false trips.❗ QD Cable Matching Risk: 95UVS2-1 uses proprietary 59-547 series 8-pin quick-disconnect cable, generic multi-core cable cannot mate the QD socket, original Fireye cable must be purchased separately.❗ Purge Air Mandatory Risk: Continuous oil-free dry instrument purge air is required at all operating times; missing purge air leads to rapid lens soot / oil fouling, UV signal attenuation and frequent flame fault alarms; air supply must install dual oil/water coalescing filters.❗ Sight Path Alignment Risk: Quartz lens must directly target the burner flame root (highest UV flicker zone); aiming at furnace refractory wall or secondary air zone without flame core creates weak unstable UV signal and intermittent flame dropout alarms.❗ Power Polarity Risk: Reverse 24VDC supply polarity immediately locks the scanner into permanent fault state requiring full power cycle reset; sustained reversed DC power permanently damages internal mainboard microcontroller and Modbus communication circuit.❗ Over-Temperature Damage Risk: Housing ambient surface temperature cannot exceed +65°C; long-term overheating degrades solid-state UV sensor and optical lens coating, invalidating SIL3 safety certification performance.

4-step replacement guide

1. Pre-install LOTO: Lock out burner fuel supply and 24VDC control power; wait furnace full cooling to avoid high-temperature burns; wear ESD grounding wrist strap to prevent static circuit damage; photograph original sight pipe mounting angle and QD cable cabinet wiring layout for maintenance reference.
2. Removal: Close purge air isolation valve, disconnect QD quick-disconnect cable plug from scanner rear socket; loosen flange fixing bolts, detach scanner body from furnace sight pipe; label cabinet-side 24VDC power, 4–20mA analog, Modbus communication and flame/fault relay wiring terminals.
3. Hardware Install: Mount separate NPT/BSP sight pipe flange kit on furnace sight tube; install new 95UVS2-1 scanner to flange assembly, adjust mounting angle to center lens on burner flame root; connect filtered dry purge air to 3/8” inlet port, adjust flow rate to standard 4SCFM; mate matching Fireye 59-547 QD extension cable to scanner socket, wire cabinet control terminals strictly following original polarity labeling.
4. Power-On Commissioning: Restore 24VDC control power, scanner Power LED illuminates steady and LCD initializes normally; ignite main gas burner flame, activate front-panel Learn mode to auto-calibrate primary flame signature into File 1; switch remote file select contacts to test all 4 stored flame profiles, confirm Flame LED steady ON and 4–20mA analog output stable within 12–18mA range; connect Modbus SCADA to verify real-time flame strength and fault code data upload; simulate flame loss by cutting fuel supply, confirm flame relay drops out within configured FFRT and triggers fuel valve safety interlock trip.

 

FAQ

Q: What core differences separate 95UVS2-1 (S2) vs base S1 95UV-1 models?

1. S2 (95UVS2-1): 4 flame signature memory files, remote file select dry contact inputs, native Modbus RTU RS485 digital communication, enhanced multi-load burner firmware
2. S1 (95UV-1): Only 2 flame memory files, no remote file select, no Modbus digital communication, simpler single-burner basic functionalityAll mechanical housing, UV optical sensor, relay and 4–20mA analog hardware are identical between S1/S2 variants.

Q: What differentiates 95UVS2-1 InSight series from 85UVF Phoenix series UV scanners?

1. 95UVS2-1 InSight I: S2 multi-file storage + Modbus RTU digital communication, larger LCD display, long-range sighting capability, target large plant DCS/SCADA integration gas boiler projects
2. 85UVF Phoenix II: Compact body, no Modbus, 1 single flame memory file only, lower cost for standalone small burner systems without digital SCADA requirements

Q: Can 95UVS2-1 work with third-party Siemens / Honeywell burner PLC and DCS systems?Yes. It uses standard isolated 4–20mA analog output, independent Form C dry contact relay signals and open Modbus RTU protocol with no proprietary locked communication, fully compatible with all mainstream industrial burner control and SCADA platforms.

Q: What fault conditions will trigger the fault relay to de-energize?Solid-state UV sensor degradation, quartz lens full soot/oil blockage, internal mainboard electronics failure, 24VDC supply voltage outside rated range, QD cable open/short circuit, continuous self-diagnosis flame signal mismatch error.

Q: What warranty coverage applies to brand-new surplus 95UVS2-1 scanners?Stocked new units carry a 12-month functional warranty covering solid-state UV sensor, optical lens coating, mainboard microcontroller, Modbus communication circuit, relay contacts and housing sealing defects. Damage caused by missing purge air lens fouling, over-temperature operation, reversed DC power polarity, non-Fireye mismatched QD cables or unfiltered oily purge air is excluded from warranty coverage.

Q: Is there a modern drop-in replacement for discontinued 95 InSight series scanners?Fireye’s current InSight II 95UV3-S2 is the upgraded successor model; it retains S2 multi-file and Modbus functions, but QD pinout, flange mechanical dimensions and internal firmware flame processing logic are partially revised, requiring sight pipe flange rework and full flame profile re-learning; no fully plug-and-play direct swap without site modification.

Q: Why cannot 95UVS2-1 be used on heavy fuel oil burners?Heavy fuel oil combustion produces minimal deep 295–320nm UV radiation, the narrow optical filter on 95UVS2-1 cannot capture sufficient flame signal; K3 wide-spectrum 310–500nm 85UVF1-1QDK3 scanner must be selected for HFO / waste oil firing applications.