Product Core Brief

• Model: 85UVF1-1QD
• Brand: Fireye (Emerson combustion safety brand, Phoenix Series 2 microprocessor integrated flame scanner)
• Model Code Decode85UVF = Phoenix integrated UV flame scanner with internal relay & full self-diagnosis1 = Standard UV spectral range (295–320nm, for natural gas / light oil fuels)-1QD = 8-pin quick-disconnect (QD) electrical connector, no factory captive cable, separate matching cable 59-546-x required
• Core Function: All-in-one solid-state ultraviolet flame monitor, analyzes flame flicker modulation frequency/amplitude to judge flame presence; built-in microcontroller auto-learns flame threshold, integrates flame relay, fault relay and 4–20mA flame strength analog output; full electronic self-check, SIL3 safety certified, works with standalone burner systems or PLC/DCS without external flame amplifiers. Fully compliant with NFPA, UL, FM, Exida SIL3 machinery combustion safety standards.
• Product Type: Complete scanner body (cast aluminum housing, solid-state UV sensor, front keypad & LED indicators, purge air port, 8-pin QD socket)
• Key Specs: Solid-state UV sensor 295–320nm; 24VDC power; built-in Form C flame/fault relays; 4–20mA flame intensity output; auto-learn flame threshold; full continuous self-diagnosis; IP65/NEMA4X sealed; Class I Div2 hazardous location rated.Note: Legacy Phoenix Series 2 mature model, stocked brand-new surplus; QD quick-disconnect design simplifies field cable replacement vs fixed cable variants. Separate mounting flange (NPT/BSP) and QD cable must be ordered separately.

 

Key Technical Specifications

 

Optical & Flame Detection Performance

• Spectral response: 295–320nm UV band, only responds to flame UV flicker; rejects furnace IR heat, ambient visible light, sunlight false triggersFireye
• Detection principle: Captures flame modulation flicker amplitude across wide frequency range; auto-learn flame signature in <60s, auto-select sensor gain and trip thresholdsFireye
• Supported fuels: Natural gas, propane, methane, light fuel oil, kerosene
• Flame loss response time: < 2 seconds
• Effective sighting distance: Up to 2.5m with clean lens and proper purge air
• Field of view: 90° conical wide viewing angle

 

Electrical & Signal Outputs

• Power supply: 24VDC ±10% DC, low power consumption
• Relays (2 independent Form C SPDT dry contacts):
  1. Flame relay: Energized when valid flame detected (1A @ 30VDC resistive)
  2. Fault relay: Energized for scanner hardware fault, lens blockage, sensor failure, wiring open circuit
• Analog output: Isolated 4–20mA linear signal (4mA = no flame, 20mA = maximum flame intensity) for DCS/PLC trending
• Electrical connection: 8-pin quick-disconnect QD socket, matching cable series 59-546-x (separate accessory)
• Front interface: 4-button programming keypad + multi-color LED indicators (Ready / Flame / Fault / Learn mode)

 

Mechanical, Purge Air & Mounting

• Housing: Die-cast aluminum powder coated, IP65 / NEMA4X dust, water, oil splash resistant
• Purge air port: 3/8” NPT threaded inlet for cooling & lens anti-fouling purge airStandard purge flow: 3–5 SCFM clean, oil-free dry instrument air
• Sight pipe flange: Flange kit sold separately (P/N 129-168-1 NPT / 129-168-2 BSP)ManualsLib
• Overall dimensions: 227mm L × 112mm W × 90mm H
• Net weight: ~2.69kg
• Minimum sight pipe inner diameter: ≥25mm, straight unobstructed sight path to flame root

 

Environmental & Safety Certifications

• Ambient operating temp: -40°C ~ +65°C housing surface; internal electronics max +82°C
• Storage temperature: -40°C ~ +85°C
• Vibration resistance: Continuous furnace vibration tolerant without signal drift
• Safety approvals: FM Class I Div2 Groups A/B/C/D; CE; UL/cUL; Exida SIL3 functional safety certifiedFireye

 

Compatible System Architecture

1. Standalone burner control: Directly drive fuel valve interlock via internal flame relay
2. PLC / DCS system: Use 4–20mA analog + fault relay digital inputs
3. Compatible Fireye controllers: Works with all Fireye Phoenix burner management systems; also universal for third-party 24VDC burner PLCs (no proprietary pulse protocol like 45UV5 series)

 

Product Introduction

Fireye 85UVF1-1QD belongs to the second-generation Phoenix integrated flame scanner series, a high-reliability SIL3 safety solution for industrial boilers, thermal fluid heaters, process furnaces and refinery process burners. The biggest upgrade compared to old tube-type UV scanners (45UV5 series): solid-state semiconductor UV sensor + on-board microprocessor, eliminating fragile gas-filled UV tubes and mechanical self-test shutters, realizing full electronic continuous self-diagnosis without moving parts, greatly lowering maintenance failure ratesstaging.fi….

The -1QD quick-disconnect design replaces fixed captive cable models: the scanner body only has an 8-pin QD socket, users match standard QD extension cables of custom length on-site. When cable aging or damage occurs, only the cable needs replacement without dismounting the scanner body from the furnace sight pipe, drastically cutting shutdown maintenance time.

One-click auto-learn function simplifies commissioning: ignite the burner, activate Learn mode, the scanner automatically samples flame flicker characteristics, locks optimal flame ON/OFF trip thresholds and gain parameters in seconds, no complex manual potentiometer adjustment required. Real-time 4–20mA analog output continuously transmits flame strength data to DCS for long-term combustion efficiency trending. Dual independent relay contacts provide redundant flame/fault hardwired safety interlock signals to fuel cut-off valves, complying with global NFPA boiler flame failure protection codes.

Typical application scenarios: Power plant auxiliary boilers, chemical plant heating furnaces, refinery reformer burners, food industry hot air ovens, textile thermal oil furnaces, gas-fired incinerators.

 

QA & Testing SOP

1. Incoming Inspection: Verify model marking 85UVF1-1QD QD socket intact; inspect UV quartz lens scratch-free, aluminum housing crack-free, keypad buttons responsive, LED indicators normal; confirm original factory datasheet CU-119C and anti-static packaging seal intact.
2. Bench Functional Test: Supply stabilized 24VDC power, connect QD cable; simulate UV flame source, run 24-hour continuous operation test, validate auto-learn flame threshold, flame relay pull-in/drop-out action, linear 4–20mA output, fault relay trigger under simulated lens blockage/sensor fault.
3. Purge Air & Sealing Test: Feed standard 4SCFM dry purge air to inlet, check housing sealing air tightness; high/low temperature cycling test to eliminate lens fogging and signal drift.
4. Parameter Record Backup: Document QD cable pin definition, standard purge air pressure, recommended sight pipe length range for field maintenance reference.
5. Final Packaging: Attach serialized test pass tag with flame response and self-diagnosis test data; wrap scanner with shock-absorbing foam, seal in static shielding bag to protect UV lens during transit.

 

Installation Pitfalls & 4-Step Replacement Guide

❗ QD Cable Matching Risk: 85UVF1-1QD has no built-in cable; must purchase matching Fireye 59-546-x 8-pin quick-disconnect cable separately, generic multi-core cable cannot mate the QD socket.❗ Purge Air Critical Risk: Continuous oil-free dry purge air is mandatory; no purge air leads to rapid lens oil ash fouling, UV signal attenuation and frequent false flame loss trips; air source must install oil/water filter.❗ Sight Path Alignment Risk: Lens must aim directly at flame root (highest UV flicker zone); targeting furnace wall or secondary air without flame core results in weak unstable UV signal and intermittent flame fault alarms.❗ Power Polarity Risk: 24VDC reverse polarity instantly locks the scanner into fault state, requires power cycle reset; long-term reversed supply damages internal microcontroller circuit permanently.❗ Over-Temperature Damage Risk: Housing ambient temperature cannot exceed +65°C; long-term overheat degrades solid-state UV sensor and electronic board, losing SIL3 safety performance.

4-step replacement guide

1. Pre-install LOTO: Lock out burner fuel supply and 24VDC control power; wait furnace full cooling; wear ESD grounding wrist strap; photograph original sight pipe mounting angle and QD cable wiring layout for reference.
2. Removal: Close purge air valve, disconnect QD quick-disconnect cable from scanner body; loosen flange fixing bolts, detach scanner from furnace sight pipe; label 24VDC power, 4–20mA analog and relay wiring terminals on cabinet side.
3. Hardware Install: Mount separate NPT/BSP flange kit on furnace sight pipe; install new 85UVF1-1QD scanner to flange, adjust angle to center lens on burner flame root; connect filtered dry purge air to 3/8” inlet, adjust flow to 4SCFM; mate matching 59-546-x QD cable to scanner socket, wire cabinet side per original polarity.
4. Power-On Commissioning: Restore 24VDC power, scanner Ready LED lights steady; ignite main burner flame, activate front-panel Learn mode to auto-calibrate flame threshold; confirm Flame LED steady ON, 4–20mA analog output stable within 12–18mA; simulate flame loss by cutting fuel supply, verify flame relay drops out within 2s and triggers fuel valve safety interlock trip.

 

FAQ

Q: What is the core difference between 85UVF1-1QD and old 45UV5 series UV scanners?

1. 85UVF1-1QD: Solid-state UV chip, electronic self-check (no mechanical shutter), built-in microcontroller + flame relay, 24VDC power, universal PLC/DCS compatibility, certified
2. 45UV5: Gas-filled UV tube, mechanical electromagnetic self-test shutter, AC powered, proprietary pulse signal only compatible with Fireye dedicated burner controllers, no analog 4–20mA output

Q: What does -1QD stand for?-1 = Standard 295–320nm UV spectrum for gas/light oil fuels; QD = Quick Disconnect 8-pin plug socket, scanner body without fixed factory cable, extension cable purchased separately.

Q: Can 85UVF1-1QD work with third-party Siemens / Honeywell burner controllers?Yes. It uses standard 24VDC power, independent Form C relay dry contacts and isolated 4–20mA analog output, no proprietary communication protocol; compatible with all mainstream PLC and burner control systems.

Q: What failure conditions trigger the fault relay?Solid-state UV sensor degradation, lens full fouling/blockage, internal electronics fault, 24VDC power out-of-range, QD cable open/short circuit, self-diagnosis mismatch.

Q: What warranty applies to new surplus 85UVF1-1QD scanners?Stocked brand-new units carry a 12-month functional warranty covering solid-state UV sensor, microcontroller board, relay contacts and housing sealing defects. Damage caused by missing purge air fouling, over-temperature operation, reversed DC polarity, mismatched non-Fireye QD cables or unfiltered oily purge air is excluded from warranty coverage.

Q: Is there a modern drop-in replacement for discontinued 85UVF series?Fireye current Phoenix 3 series 85UVF3 models are the upgraded successor; spectral detection and safety functions are consistent, but QD pinout and flange mechanical dimensions are partially revised, requiring sight pipe flange rework and parameter re-learning; no full plug-and-play direct swap without modification.