Fireye 85UVF1-1CEX Integrated UV Flame Detector

Description

1. Product Overview

Model: 85UVF1-1CEX 

Brand: Fireye

Product Name: Phoenix Series Integrated Ultraviolet Flame Detector (1 Second Flame Failure Response Type)

Product Positioning: Fireye Phoenix 2nd-Generation industrial intelligent flame scanner is a dedicated core flame monitoring device for boilers and burners, serving as a critical safety detection unit of industrial combustion control systems. Integrated with sensor, signal processing chip, relay output and self-check circuit, it provides continuous and accurate flame status monitoring and flame failure protection for combustion systems. Suitable for various harsh industrial combustion conditions, it is standard equipment for safety interlock control of thermal units.

Core Functions: Continuously collect exclusive ultraviolet spectral signals from combustion flames to accurately identify flame presence and intensity inside furnaces. Featuring millisecond-level flame signal sampling and rapid 1-second flame failure response, it triggers interlock protection instantly upon flame extinction to eliminate safety hazards such as furnace deflagration, flashback and unbalanced air-fuel ratio. Equipped with 4–20mA analog output and relay digital output, it realizes flame status uploading, system interlock shutdown and fault alarm, ensuring safe and stable operation of industrial combustion equipment.

Applicable Equipment: Industrial gas/oil burners, utility boilers, industrial furnaces, hot blast stoves, incinerators, process heating furnaces and other flame combustion equipment. Compatible with the full Fireye combustion control system as well as mainstream DCS and PLC automatic control systems.

Application Scenarios: Widely adopted in thermal power generation, petrochemical industry, metallurgy, heating supply, pharmaceutical, waste incineration and other industrial sectors. Suitable for wall-mounted local installation and external furnace monitoring, capable of long-term operation under severe industrial environments featuring high temperature, dust and strong electromagnetic interference.

2. Technical Features

1. High-Precision Exclusive UV Flame Detection Adopts solid-state dedicated UV sensor chip to precisely capture the exclusive ultraviolet band of 185–260 nm emitted by flames. It effectively rejects interference signals including furnace infrared thermal radiation, ambient natural light and equipment lighting, preventing false detection and missed detection. It only responds to actual combustion flames, delivering superior detection accuracy and anti-interference performance compared with ordinary flame detectors.

   
   

2. Rapid Flame Failure Protection with 1 Second Response This model comes with a standard Flame Failure Response Time (FFRT) of 1 second. As a fast-response flame detector, it activates protection logic immediately after abnormal flame loss. It is applicable to critical furnace equipment in power plants and chemical plants with strict requirements on safety interlock speed, minimizing risks of furnace deflagration.

   
   

3. Integrated Intelligent Design The unit integrates sensor, signal processing module, flame relay, fault relay and analog output circuit. No external signal conversion module is required; it can independently complete flame detection, signal output and fault self-diagnosis. Compact structure facilitates networking and greatly simplifies field wiring and system configuration.

   
   

4. Full-Function Hardware Self-Diagnosis Protection Built-in comprehensive self-test mechanism monitors sensor failure, circuit abnormality, power supply fault and signal disconnection in real time. In case of faults, the fault relay is triggered automatically and detection logic is locked to avoid monitoring blind spots caused by equipment failure, meeting high safety redundancy requirements of industrial combustion systems.

   
   

5. Standardized Signal Output Compatibility Standard 4–20mA analog output transmits real-time flame intensity values to DCS systems. Passive relay digital outputs can be directly connected to interlock circuits. It satisfies both data monitoring and safety control demands and supports connection with various automatic control systems.

   
   

6. Adaptability to Severe Industrial Conditions Sealed aluminum alloy housing with IP65 high protection rating, dust-proof, moisture-proof, high-temperature resistant, shock-resistant and anti-electromagnetic interference. Adaptable to harsh environments around furnaces with high temperature, dust and strong radiation. Supports 7×24-hour non-stop continuous operation with excellent stability and service life.

   
   

7. Convenient Installation and Parameter Configuration 8-pin quick-disconnect (QD) connector enables easy assembly and standardized wiring. Supports automatic calibration and manual parameter adjustment to adapt to flame characteristics of different fuels and operating loads. It can match various combustion equipment without complicated commissioning, delivering convenient maintenance and strong versatility.

3. Specification Parameters

4. Working Principle

1. Device Initialization and Self-Calibration After powered by DC24V, the device automatically completes power-on initialization, comprehensive self-inspection of hardware circuits, sensor chips, output loops and communication interfaces, as well as automatic calibration of flame detection threshold and signal gain. If no abnormality is detected during self-test, it enters real-time monitoring mode and stands by to receive furnace flame signals to guarantee fault-free startup and accurate detection parameters.

   
   

2. UV Flame Signal Acquisition and Filtering The dedicated UV sensor continuously collects 185–260nm exclusive ultraviolet spectral signals generated by furnace combustion. Embedded intelligent filtering algorithm automatically eliminates invalid interference such as high-temperature infrared radiation inside furnaces, ambient light and electromagnetic noise, retaining only authentic flame characteristic signals to fundamentally avoid false and missed detection.

   
   

3. Flame Status Judgment and Intensity Calculation The main control chip compares collected flame characteristic signals with preset calibrated thresholds in real time to accurately judge flame presence, flame loss or weak flame conditions. Meanwhile, flame combustion intensity is calculated based on spectral amplitude and spectral density and converted into standard 4–20mA analog signals to reflect operational stability of combustion.

   
   

4. Signal Output and Logic Interlock Under normal combustion conditions, the device continuously outputs flame presence relay signals and stable 4–20mA intensity signals, indicating normal combustion status to the system. In the event of unexpected flame extinction inside the furnace, the device triggers the 1-second rapid flame failure response: the flame relay opens immediately and the fault relay actuates. Fault signals are uploaded to DCS/PLC simultaneously to activate safety interlock logic including burner shutdown, fuel cut-off and furnace purging.

   
   

5. Continuous Fault Self-Diagnosis and Protection During operation, the unit constantly monitors equipment abnormalities including sensor failure, line breakage, abnormal power supply and chip faults. Once hardware failure is detected, detection logic is locked and fault alarm signals are output to prevent loss of flame monitoring caused by equipment malfunction, ensuring the whole combustion system remains safely controllable.

5. Common Faults and Troubleshooting

1. Phenomenon: No response after power-on, no flame signal output and no alarm Possible Causes

   ① Abnormal DC24V supply voltage, reversed polarity or open circuit in power loop;

   ② Loose 8-pin quick-disconnect connector, poor contact caused by oxidized pins;

   ③ Damaged internal circuit or mainboard failure.

Troubleshooting Cut off power supply, measure DC24V voltage and polarity, inspect power lines and circuit breakers. Reconnect and fasten the quick-disconnect connector, clean oxidized pins and standardize wiring. If the device remains unresponsive with normal power supply and wiring, hardware failure is confirmed; factory repair or equipment replacement is required.

2. Phenomenon: Normal furnace combustion, yet false flame loss alarms and frequent flame dropout Possible Causes

   ① Dust, oil contamination or coking on probe lens blocking UV signal collection;

   ② Improper flame detection threshold setting, mismatched sensitivity with operating conditions;

   ③ Offset probe installation angle failing to aim at core flame zone;

   ④ Signal fluctuation induced by on-site electromagnetic interference.

Troubleshooting Stop equipment and clean dust, coking and oil stains on probe lens to maintain light transmission. Re-calibrate flame detection sensitivity and thresholds to match unit combustion load. Adjust probe mounting angle and monitoring distance to target the core combustion zone. Implement cable shielding and grounding to eliminate electromagnetic interference.

3. Phenomenon: No flame inside furnace, while device falsely indicates flame presence with persistent abnormal signal Possible Causes

   ① Unfiltered residual high-temperature furnace radiation and external UV interference;

   ② Parameter drift and failed calibration of the device;

   ③ Aging sensor chip leading to offset detection accuracy.

Troubleshooting Identify on-site interference sources and eliminate external UV disturbance. Execute automatic device calibration again to adjust detection thresholds and signal gain. If calibration fails, sensor aging fault is confirmed and the flame detector probe needs replacement.

4. Phenomenon: Severe fluctuation of 4–20mA analog signal, unstable flame intensity readings Possible Causes

   ① Poor shielding and non-standard grounding of signal cables;

   ② Violent fluctuation of furnace combustion conditions;

   ③ Abnormal signal filtering parameters of the device;

   ④ Loose wiring contact.

Troubleshooting Standardize shielding layer grounding of signal cables and tighten terminals. Optimize unit combustion conditions and stabilize fuel supply. Re-calibrate signal filtering parameters to suppress fluctuating noise. Inspect and repair loose connections to ensure stable signal transmission.

5. Phenomenon: Slow protection response upon flame loss; interlock fails to activate within 1 second Possible Causes

   ① Modified device response time parameter, default 1-second protection setting not retained;

   ② Signal transmission delay and abnormal background interlock logic configuration;

   ③ Abnormal device program and disordered parameters.

Troubleshooting Verify flame failure response parameter and restore standard FFRT setting of 1 second. Inspect DCS interlock logic configuration and correct delay parameters. Restart the device to reset program, restore factory calibration parameters and re-test flame failure protection response performance.

6. Phenomenon: Frequent hardware fault alarms, continuous actuation of fault relay Possible Causes

   ① Component aging caused by long-term high-temperature operation;

   ② Intermittent open circuit or short circuit of quick-disconnect wiring;

   ③ Faulty self-test circuit and abnormal mainboard.

Troubleshooting Improve heat dissipation in probe installation area to avoid prolonged over-temperature operation. Fully inspect connectors and cables, repair damaged and loose wiring. If frequent faults persist with normal wiring and operating conditions, mainboard hardware damage is confirmed and original equipment replacement is required.