Product Overview
When industrial burners fail to maintain a stable flame, the risk of explosion and system downtime escalates dramatically. The Fireye 85UVF1A-1QD integrated flame scanner is designed precisely to prevent such failures by providing reliable ultraviolet (UV) flame detection and an internal flame relay. This industrial automation module continuously monitors flame presence, delivering immediate relay output to ensure burner safety. With its rugged cast aluminum housing and wide ambient temperature tolerance, the 85UVF1A-1QD performs consistently in harsh environments.
Technical Specifications
The Fireye 85UVF1A-1QD integrates several critical electrical and mechanical specifications for dependable operation. Below are the key parameters drawn directly from the product datasheet:
-
Detection Method: Ultraviolet (UV) flame detection
-
Input Power: 24 Vdc nominal, supply current 200 mA
-
Relay Outputs: Flame relay SPST (N.O.) and fault relay SPST (N.C.)
-
Contact Rating: Minimum 10 mA @ 5 Vdc; maximum 2 A @ 30 Vdc or 2 A @ 230 Vac (resistive load)
-
Analog Output: Optically isolated 4-20 mA dc current (max load 750 ohms)
-
Temperature Rating: -40°F/-40°C to 150°F/+65°C ambient; scanner internal temperature up to 180°F/82°C
-
Humidity: 0% to 95% relative humidity, non-condensing
-
Pollution Degree: 2
-
Overvoltage Category: III
-
Housing Material: Cast aluminum with gray polyester powder coat (basic models -1QD)
-
Scanner Weight: 5.90 lbs (2.69 kg)
-
Electrical Connection: 8-pin quick-disconnect
Real-World Applications
The Fireye 85UVF1A-1QD is employed in industrial burner management systems where flame failure must be detected instantly. Typical applications include power utility boilers, process heaters in refineries, and large commercial combustion systems. By leveraging UV sensing, the 85UVF1A-1QD can discriminate between actual flame and hot refractory background, reducing nuisance shutdowns. Its internal flame relay directly interfaces with safety shutoff valves, ensuring that gas or oil supply is cut within milliseconds if the flame is lost.
Installation and Setup Guidance
Mount the Fireye 85UVF1A-1QD so that its UV sensor has a clear line of sight to the flame. The mounting flange requires a 3/8" NPT or 1-inch "Y" fitting; use clean, dry cool purge air at 4 SCFM (113 l/min) to keep the lens clear. For high-temperature or dusty applications, increase purge air up to 15 SCFM. Connect the 8-pin quick-disconnect cable per the pinout: supply 24 Vdc (200 mA), wire the flame relay (SPST N.O.) to the burner management system, and the fault relay (SPST N.C.) to an alarm. The 4-20 mA analog output provides flame strength signal for trending. Ensure the analog output load does not exceed 750 ohms; Fireye recommends the 60-2685-X 24 Vdc power supply for best SELV-rated performance.
Troubleshooting Common Issues
If the 85UVF1A-1QD fails to detect a known flame, first check the UV sensor window for dirt or soot; clean it according to the maintenance schedule. Verify that the purge air supply is adequate and that the sight pipe is not obstructed. If the flame relay does not energize, inspect the 8-pin connector for damage or moisture. LED indicators on the unit show flame signal strength and fault codes—refer to the LED status chart to diagnose specific problems. False flame indication can occur if hot refractory is within the scanner’s view; adjust the sighting angle or use a fiber optic cable assembly (available separately) to redirect the view.
Selection Guide and Purchasing Advice
When ordering the Fireye 85UVF1A-1QD, confirm that your application requires a basic -1QD model (non-hazardous area). For ATEX-rated environments, choose the CEX model instead. The scanner works with 24 Vdc power only—do not use AC power despite the earlier note; the internal electronics require DC. Ensure your burner management system accepts the relay contact ratings. For technical support or to secure genuine Fireye parts, contact PLC Source PRO (formerly ubest101). We stock the 85UVF1A-1QD and related accessories, ready for quick shipment.