Product Details

The Fireye UV7A4 is a high‑sensitivity non self‑check ultraviolet flame scanner, the standard version without NEMA 4 weatherproof housing, compared with UV7A4W. This UV scanner captures ultraviolet radiation from combustion flame and transmits flame signal to Fireye MB, SB series burner controls and MBPF flame sensing modules. As a reliable flame sensor, it comes with 4 feet shielded flexible conduit and 1/2 inch NPT insulated nylon coupling, designed for indoor industrial combustion environments. This detector is widely used as replacement spare for frequently cycling gas and light oil burners. This Fireye UV7A4 scanner is stocked as genuine replacement spare part for boiler flame supervision.

Basic Parameters

Brand: Fireye

Model: UV7A4

Type: Non self‑check UV flame scanner

Supply voltage: 425 VDC ±25 VDC

Discharge current: 0.3 mA

Cable: 4 ft shielded flexible conduit

Mount thread: 1/2" NPT, insulated nylon coupling

Max wiring distance: 76 m (250 ft)

Compatible control: Fireye MB, SB series, MBPF‑100S, MB‑600PF

Supported fuels: Natural gas, propane, light fuel oil

Difference note: UV7A4 = standard; UV7A4W = NEMA 4 weatherproof version

Approvals: FM, cULus listed

Product type: Original Fireye flame scanner spare sensor

Supported Functions

This ultraviolet flame detector senses UV light emitted by burner flame and sends valid flame signal to the matched flame safeguard module. When flame extinguishes, the scanner stops outputting flame signal and triggers safety lockout and fuel shutoff. It relies on the host burner control to perform scanner fault check at the start and end of each firing cycle.

Core Functions

The internal UV tube generates pulse signals under flame ultraviolet radiation. The shielded flexible conduit effectively reduces electromagnetic interference. Its compact structure allows simple installation and supports direct drop‑in substitution for existing UV7A4 scanners on compatible Fireye combustion systems.

Hardware Specifications & Environmental Features

Mounting: 1/2" NPT sight fitting

Case operating temperature: -20 °C to +60 °C

Storage temperature: -40 °C to +70 °C

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

Housing: Standard metal housing, non‑weatherproof

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 amplifier compatibility and wiring length before ordering.

This is from our current stock.

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