HTS IFM – U2 Flame Monitoring Viewing Head and Signal Processor

Overview

The Honeywell U2S Series is an all-in-one integrated viewing head and signal processor engineered for demanding industrial flame-monitoring applications. This self-checking UV/IR combination unit eliminates the need for a separate external signal processor, reducing cabinet space and wiring complexity while simplifying installation and ongoing maintenance.

The U2S Series features an updated, fully programmable touchscreen display with an intuitive scrolling menu, multiple sensor options, and flexible discrimination settings — making it well suited for single or multi-burner, multi-fuel, and challenging applications. It is rated for use in SIL 3 applications and carries FM, CSA, ATEX, and IECEx certifications.

Features & Benefits

• All-in-one design — Integrated viewing head and signal processor eliminates a separate processor, reducing cabinet space and wiring requirements.
• Electronic self-check — No mechanical shutter required; electronic check design reduces moving parts and maintenance demands.
• Multiple sensor options — Available with UV Tube, Solid State IR, and Solid State UV sensors to match fuel type and application requirements.
• Adjustable gain settings — Individual gain adjustment for each sensor type for precise signal optimization.
• Ten selectable flicker frequency filters — Model-dependent selection enables superior flame discrimination across mixed-fuel and multi-burner environments.
• Touchscreen programming interface — Updated, fully programmable touchscreen with scrolling menu for enhanced usability and configuration.
• Two-wire Modbus RTU communication — Compatible with FlameTools software or other Modbus master devices for external programming and monitoring.
• File Select I/O — External control of two preprogrammed device file settings with feedback to the burner control system.
• Analog flame signal output — Selectable 0–20 mA or 4–20 mA output for integration with DCS or BMS systems.
• Adjustable flame on/off threshold and FFRT — FFRT adjustable at 1, 2, or 3 seconds.
• Wide ambient temperature range — Rated –40°F to 158°F (–40°C to 70°C) for operation in harsh environments.
• IP66 enclosure — Rated for dusty and wet industrial environments.
• Not adversely affected by x-rays or gamma rays — Suitable for radiation-present process environments.
• SIL 3 capable — Fit for use in Safety Integrity Level 3 applications.

Technical Specifications

• Input power: 22–26 VDC, 120 mA max
• Output relay contacts: One normally open flame relay and one normally open fault/self-check relay, 1A, 30 VDC
• Analog output: 0–20 mA or 4–20 mA, selectable
• Ambient temperature: –40°F to 158°F (–40°C to 70°C)
• Enclosure rating: IP66
• Mounting: 25.4 mm (1 in) NPT
• Adjustable FFRT: 1, 2, or 3 seconds
• Communication: Two-wire Modbus RTU
• Approximate dimensions: 155 mm (6.1 in) length × 117 mm (4.6 in) diameter
• Approvals (Quick-disconnect version): Class I Div 2 Gr A, B, C, D T5; ATEX/IECEx Ex nA nC IIC; Ex tb IIIC
• Approvals (PF version): Class I Div 1 Gr A, B, C, D, E, F, G T6; ATEX/IECEx Ex d IIC; Ex tb IIIC
• Additional certifications: FM, CSA, EN298, EAC; pending INMETRO & KTL
• Safety rating: Fit for use in SIL 3 applications

Applications

• Industrial process boilers
• Co-generation boilers
• Cement and lime kilns
• Thermal oxidizers
• Flare stacks
• Gas turbines
• Black liquor recovery units
• Sulfur recovery units
• Power generation
• Petrochemical and petroleum processing
• Pulp and paper
• Metals finishing

Models / Configurations

• U2-1010S – IR / UV Tron / UVSS sensor; quick-disconnect cable; suitable for all fuels
• U2-1010S-PF – IR / UV Tron / UVSS sensor; factory-installed 10 ft cable; suitable for all fuels
• U2-1010S-PF-050 – IR / UV Tron / UVSS sensor; factory-installed 50 ft cable; suitable for all fuels
• U2-1010S-PF-100 – IR / UV Tron / UVSS sensor; factory-installed 100 ft cable; suitable for all fuels
• U2-1012S – IR sensor; quick-disconnect cable; suitable for oil and coal
• U2-1012S-PF – IR sensor; factory-installed 10 ft cable; suitable for oil and coal
• U2-1016S – UV Tron sensor; quick-disconnect cable; suitable for gaseous fuels
• U2-1016S-PF – UV Tron sensor; factory-installed 10 ft cable; suitable for gaseous fuels
• U2-1018S – IR / UV Tron sensor; quick-disconnect cable; suitable for all fuels
• U2-1018S-PF – IR / UV Tron sensor; factory-installed 10 ft cable; suitable for all fuels

U2S Series Accessories

• ASYU2S – 50 ft cable assembly with connector
• ASYU2S-100 – 100 ft cable assembly with connector
• ASYU2S-200 – 200 ft cable assembly with connector
• ASYU2S-300 – 300 ft cable assembly with connector

Documentation