HoneywellHoneywell U2 All-In-One Viewing Head

Honeywell U2 All-In-One Viewing Head

The Honeywell U2 flame monitoring system combines sensing and processing in one package. The U2 is available in several models to provide different options. Each model includes one, two or three sensors which share the same optical axis. The U2 can be connected either through a detachable connector or a pipe fitting for installations with conduit

The U2 all-in-one viewing head with integrated signal processor delivers flame discrimination in the toughest environments. With automatic setup and the ability to monitor UV and IR flame components simultaneously or separately, the U2 all-in-one flame scanner offers improved burner up time and reliability.

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Honeywell U2 All-In-One Viewing Head

Sensor: Solid State UV sensor, UV Tube (UVTron), Solid State IR sensor or a combination of these three sensors

Response UVSS: 310 nm / UVTron: 210 nm / IR: 1400 nm

Technology: Flicker (UVSS), Pulse Count (UVTron) and Flicker (IR)

Self-check: Electronic "shutter": no mechanical moving parts

All-in-one flame scanner: no additional wiring cabinet needed

U2 viewing heads use Modbus communication (RS485) for remote configuration and status reading.

U2 viewing heads have a dual LED display for flame signal monitoring onsite.

All viewing heads are immune to X-Rays and Gamma radiation, making them ideal for myriad industrial applications.

Unlike other flame scanners, the U2 viewing heads perform background pulse counting for UV tube health and therefore doesn't need a mechanical shutter system for self-checking.


Touch screen user interface:

A tempered and fully sealed glass touch wheel sensor: no mechanical moving buttons.

Power supply

24 Vac | 2.6 VA 

Protection class

NEMA 4x, IP66

Zone 2 Class 1 Div 2 Group A, B, C and D

IECEx II 2G Ex d IIC T6 (zone 1&2 or zone 2)

Ambient temperature

-40 ~ 70°C

Maximum humidity

85 % RH


CE approved according EN298 for continuous operation (approval pending).

CSA/FM approved

IECEx approved

ATEX approved (pending)

SIL 3 Capable certified

Housing (HxWxD)

260mm x 240mm x 235mm 


3.5 Kg

Output Signal:

4-20 mA for remote meter or DCS and local display

4-20 mA with scale multiplier (convertible to 0-20 mA)

Relay Outputs:

Wire flame and self-check relay contacts in serial to obtain fail-safe operation.

Flame relay - one normally open contact (SPST)

Self-check relay - one normally closed contact (SPST)



Flame Detector:


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