Product Details

The Fireye UV7R4 is a non-self-checking, high-sensitivity 90° right-angle ultraviolet flame scanner designed for cyclic gas and light oil burners. This 90-degree ultraviolet flame scanner captures UV radiation produced by intermittent combustion flames and transmits reliable flame presence or flame-loss feedback to Fireye burner safeguard controllers. As a professional burner UV detector, its right-angle viewing head solves limited installation space on boilers, furnaces and heating packages; it carries built-in reverse polarity protection and cycle-based scanner fault verification against short circuit and runaway sensor failure. This Fireye cyclic flame sensor is stocked as genuine replacement spare, widely used to retrofit and maintain Fireye MB series, SB series and MBPF burner management systems.

Basic Parameters

Brand: Fireye

Model: UV7R4

Type: Right-angle non-self-check UV flame scanner

Viewing angle: 90 degree

Supply voltage: 425 VDC ±25 VDC

Discharge current: 0.1 mA

Lead wire: 72 in / 1830 mm unshielded wire, #18 AWG

Max wiring distance: 76 m / 250 ft

Compatible fuels: Natural gas, propane, light fuel oil

Compatible controllers: Fireye MBSERIES, SBSERIES, MBPF modules

Certification: UL listed, FM approved

Optional accessories: Magnifying lens, insulated coupling, radiation shield

Product type: Original Fireye flame sensing spare sensor

Supported Functions

This 90-degree ultraviolet flame scanner continuously monitors UV radiation from cycling combustion flames. The burner UV detector converts optical flame signals into valid electrical feedback for the flame safeguard system. It triggers fuel shutoff sequence immediately once flame extinction is detected. This Fireye cyclic flame sensor performs automatic scanner health check at the start and end of each firing cycle and supports stable repeated on‑off operation for intermittent burners.

Core Functions

High-sensitivity UV sensing circuit distinguishes real flame UV signals and reduces false alarm from hot refractory surfaces. The 90-degree ultraviolet flame scanner’s angled housing enables flexible sighting alignment for cramped burner openings. Reverse connection protection prevents permanent damage during field wiring mistakes. Standard electrical definition supports direct drop-in replacement for a faulty UV7R4 without modifying existing burner control wiring.

Hardware Specifications & Environmental Features

Mounting: 1/2" F.N.P.T. threaded installation

Operating temperature: -20°C to +60°C

Storage temperature: -40°C to +70°C

Relative humidity: 5% – 90%, non-condensing

Lens: Fused silica quartz lens

Condition: Original new or fully tested refurbished Fireye spare part

Industry Applications: Applied in legacy petrochemical distributed control, old paper making production automation, material handling conveyor lines, packaging and textile machinery, water treatment remote signal collection and large conveyor remote I/O control racks.

Note: Confirm 800 series backplane compatibility, pulse signal type, counting mode and preset logic before ordering.

This is from our current stock.

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