Product Details

The Fireye UV7A4W is a non self‑check high‑sensitivity ultraviolet flame scanner with NEMA 4 rated enclosure, the weather‑protected variant of standard UV7A4. This UV scanner detects UV radiation from combustion flame and sends flame signal to Fireye MB, SB series burner controls and MBPF flame sensing modules. As a reliable flame sensor, it is equipped with 4 feet shielded flexible conduit and 1/2 inch NPT insulated nylon coupling, suitable for outdoor or damp industrial locations where water and dust resistance is required. This NEMA4 detector is widely used as replacement spare for gas and light oil burners with frequent cycling operation. This Fireye UV7A4W scanner is stocked as genuine replacement spare part for boiler and combustion flame supervision.

Basic Parameters

Brand: Fireye

Model: UV7A4W

Type: Non self‑check UV flame scanner, NEMA 4

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)

Enclosure: NEMA 4, dust and splash resistant

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 captures UV light emitted by burner flame and transmits valid flame signal to the matched flame safeguard module. When the flame extinguishes, the scanner stops outputting flame signal and triggers safety lockout and fuel shutoff. Since it is non self‑checking, the host control performs scanner fault checking at the start and end of each burner cycle.

Core Functions

The internal UV tube generates pulse signals under flame ultraviolet radiation. Its NEMA 4 housing offers extra protection against splashing water and dust for harsh field installations. The shielded conduit reduces electromagnetic interference, and it supports direct drop‑in substitution for existing UV7A4W scanners on compatible Fireye combustion systems.

Hardware Specifications & Environmental Features

Mounting: 1/2" NPT sight fitting

Case operating temperature: -20 °C to +125 °C

Storage temperature: -40 °C to +70 °C

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

Housing: NEMA 4 metal enclosure

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.

available stock.xlsx