Honeywell U2S Series Combination Viewing Head/Signal Processor
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Honeywell U2S Series Combination Viewing Head/Signal Processor

The U2S Series can be used in a variety of common applications including industrial process boilers, co-gen boilers, cement or lime kilns, thermal oxidizers, flare stacks, and gas turbines. In addition, the U2S Series can meet challenging flame monitoring applications like black liquor recovery and sulfur recovery.


Electronic check (no mechanical shutter)

Multiple sensor options: UV Tube, Solid State IR and Solid State UV.

Adjustable gain settings for each sensor.

Ten selectable flicker frequency filters (model dependent).

Fully programmable using touch screen interface.

Two wire Modbus RTU for external programming, compatible with FlameTools or other master device.

File Select input/output allows for external control of two pre programmed device file settings with feedback to the burner control system.

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Additional information

Spec 1

Input power: 22-26 VDC, 120 mA max.

Spec 2

Output relay contacts: one normally open flame relay and one normally open fault/self-check relay, 1A, 30 VDC.

Spec 3

Ambient temperature: -40°F to 158°F (-40°C to 70°C).

Spec 4

Analog flame signal: 0-20 mA or 4-20 mA output.

Spec 5

Enclosure: IP66, 1" NPT mounting.

Spec 6

Adjustable flame on/off threshold.
Adjustable FFRT 1, 2, or 3 seconds.

Spec 7

Not adversely affected by x-rays and gamma rays.