Key Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | FIREYE |
| Model | 85UVF1-1QDK3 |
| Product Family | Phoenix 85UVF / 85IRF flame scanners |
| Detection Principle | Solid-state UV flame detection with microprocessor-based flicker analysis |
| K3 Optical Option | Extended UV sensitivity up to ~500 nm for blast-furnace/coke-oven/low-NOx flames |
| Power Supply | 24 V DC (verify exact tolerance with OEM manual) |
| Electrical Connection | 8-pin quick-disconnect (QD) |
| Outputs | Internal flame relay, fault indication, 4-20 mA flame intensity signal |
| Flame Learning | Automatic ON/OFF threshold and sensor gain selection |
| Self-Diagnostics | Continuous electronic self-check and fault indication |
| Typical Applications | Duct burners, gas burners, low-NOx burners, BFG/COG, waste-gas units, incinerators |
| Hazardous-Area Note | QD versions are typically rated for Class I Division 2; CEX versions cover Ex d IIC T6 — confirm exact certification label |
Product Introduction
I have seen too many burner trips blamed on “bad flame” when the real problem was a standard UV scanner trying to read a weak, pulsing BFG flame. The FIREYE 85UVF1-1QDK3 is the Phoenix-series UV flame scanner built for exactly that headache. It uses a solid-state UV sensor, measures flame flicker across a wide frequency range, and automatically sets its ON/OFF threshold and gain during setup.What makes the K3 version different is the optical filter. Standard 85UVF scanners typically target the narrower UV flame band, but the K3 option extends sensitivity up to about 500 nm so it can hold signal on blast-furnace gas, coke-oven gas, and certain low-NOx or diluted flames. It runs on 24 V DC, connects through an 8-pin QD plug, and provides a 4-20 mA flame intensity signal plus internal flame/fault outputs. Just do not assume it is a drop-in replacement for every 85UVF1-1QD in the plant. The flame signature matters.
Quality SOP & Tech Pitfalls
The Lab Report (SOP)
- Visual and counterfeit check: confirm 85UVF1-1QDK3 label, K3 marking, QD connector pins, lens/window condition, and housing integrity.
- Identity cross-check: verify the application actually needs the K3 extended-UV variant, not a standard 85UVF1-1QD or 85IRF version.
- Power-up test on 24 V DC bench supply: verify LED/display response and basic self-diagnostics.
- Flame-signal simulation: check flame relay behavior and 4-20 mA output range where test equipment allows.
- Multimeter checks: screen power pins, relay outputs, and signal loop for shorts or open circuits.
- Firmware/revision logging: record hardware revision, serial number, and any visible configuration data.
- ESD and moisture protection: seal in anti-static bag with test record and photos.
The Engineer’s Warning (Pitfalls)
- K3 is not optional if the flame needs it. Replacing a K3 scanner with a standard 85UVF1-1QD can cause nuisance trips on BFG, COG, or low-NOx burners. The flame may be present, but the scanner cannot see it reliably.
- FFRT settings get overlooked. The Flame Failure Response Time must match the burner management logic. A wrong FFRT can cause either unsafe delay or unnecessary trips during normal flame flicker.
- Lens contamination kills signal. Dust, oil, or heat-soaked windows will reduce UV transmission. A clean scanner that is misaligned will still fail.
- Do not mix QD and CEX blindly. QD and CEX versions differ in electrical connection and hazardous-area certification. Swapping them without checking area classification is a safety and compliance issue.
Installation & Configuration Guide
Estimated swap time: 20 to 60 minutes, depending on burner access and BMS interlocks.
- Pre-Installation
- Place the burner in safe condition per plant procedure; follow BMS/combustion safety rules. ⚠️
- Verify flame scanner supply voltage is 24 V DC before disconnecting.
- Photograph the existing scanner label, mounting angle, connector wiring, and BMS alarm history.
- Record the current FFRT, flame threshold, and 4-20 mA signal values if accessible.
- Removal
- Disconnect the 8-pin QD connector carefully; do not pull on the cable.
- Loosen the mounting bracket or flange without dropping the scanner from the burner port.
- Inspect the sight tube, lens, and cooling air path if equipped.
- Cap the opening if the burner area is under draft or positive pressure.
- Installation
- Confirm the replacement is 85UVF1-1QDK3, not 85UVF1-1QD or 85IRF. This prevents most post-swap flame-signal problems.
- Mount the scanner at the same angle and distance as the original.
- Reconnect the 8-pin QD plug firmly; verify pin alignment.
- Check that the lens is clean and the sight path is unobstructed.
- Power-On & Testing
- Apply 24 V DC and verify scanner self-check/LED status.
- Confirm 4-20 mA output and flame/fault relay behavior.
- Perform flame learning or threshold verification per the OEM manual.
- Validate FFRT against the burner management system requirements.
- Run ignition and flame-stability checks under supervision before returning to normal operation.
Compatible Replacement Models
| Compatibility Tier | Model / Approach | Notes |
|---|---|---|
| ✅ Drop-in Replacement | 85UVF1-1QDK3 | Match K3 optical option, QD connector, 24 V DC supply, and hazardous-area rating. |
| ⚠️ Verify Before Use | 85UVF1-1QD (non-K3) | May work on clean gas flames, but can lose signal on BFG/COG/low-NOx applications. |
| ❌ Not Interchangeable | 85IRF1-1QD, 95UVS series, 45UV5 series, 85UVF1-1CEX without matching certification | Different sensor type, mounting, certification, or electrical interface. |
Frequently Asked Questions (FAQ)
Q1: What does the K3 suffix actually change?
It extends the UV scanner’s optical sensitivity up to about 500 nm. That helps it detect weaker or spectrally shifted flames from blast-furnace gas, coke-oven gas, and some low-NOx burners.Q2: Can I replace 85UVF1-1QDK3 with a standard 85UVF1-1QD?
Only if the flame signature has been verified. On BFG, COG, or marginal flames, the non-K3 version may trip even when the flame is present.Q3: Is this scanner 24 V AC or 24 V DC?
The Phoenix 85UVF QD family is typically 24 V DC. Still confirm from the nameplate and wiring diagram before energizing.Q4: Can I adjust the flame threshold manually?
The scanner auto-learns flame amplitude and gain, but FFRT and certain parameters can be set through the local keypad/LED interface. Always follow the OEM manual and plant safety procedure.Q5: What is the typical flame failure response time?
FFRT is adjustable, commonly in the 1 to 4 second range depending on configuration and certification. The final value must match the burner management system design.Q6: Does the QD version work in explosive atmospheres?
QD versions are generally suited for Class I Division 2 areas, while CEX versions cover Ex d IIC T6. Confirm the exact label before installing in a classified zone.Q7: How do I avoid buying the wrong Phoenix scanner?
Send a photo of the existing nameplate, connector type, mounting arrangement, fuel type, and BMS alarm history. Require the supplier to confirm 85UVF1-1QDK3 and the K3 optical option before shipment.
