Honeywell UV Flame Sensors – 113228/U

Technical Dossier

Product Details And Specifications

Honeywell UV Flame Sensor Series Technical Notes

The Evolution of Honeywell UV Flame Sensor Architecture

Honeywell's ultraviolet flame detection product line traces its commercial origin to the mid-20th century, when the company introduced the first self-checking UV scanner designs for industrial burner management. Early-generation sensors such as the C7027A and C7035A established the foundational UV tube-based detection architecture, using a gas-filled ultraviolet-sensitive tube that conducts current only when exposed to UV radiation in the 185–260 nm band. These sensors were paired with primary controls such as the R4140 and R7140 series.

The transition to solid-state amplifier modules in the 1980s and 1990s — represented by the RM7800 and R7847 relay module families — required corresponding updates to scanner electrical interface specifications. The C7076A and C7076C introduced self-checking UV scanner capability, where the sensor periodically interrupts its own signal path to verify that the downstream amplifier can detect a loss-of-flame condition. This self-check architecture became mandatory under IEC 61511 SIL 2 requirements for safety instrumented systems.

The 113228/U represents the current-generation replacement part for UV scanner assemblies in this lineage, providing direct compatibility with the R7847, R7848, R7849, and R7861 amplifier modules used in RM7800L, RM7840L, and RM7890 relay module configurations. As the broader RM7800 platform has entered its mature/end-of-active-production phase, sourcing of replacement UV scanner components including the 113228/U has shifted increasingly to authorized aftermarket and MRO (Maintenance, Repair & Operations) channels. Long-term maintenance support for installed RM7800-based BMS systems depends on reliable access to these scanner assemblies.

Honeywell UV Flame Sensor Full Catalog & Functionalities (SKU List)

UV Scanner / Flame Sensor Assemblies

• 113228/U: UV flame sensor replacement assembly; compatible with R7847/R7848/R7849/R7861 amplifiers
• C7027A1049: UV self-check scanner; 120 VAC; 1/2 in. NPT mount; RM7800 series compatible
• C7027A1056: UV self-check scanner; 120 VAC; 3/4 in. NPT mount; extended temperature range
• C7035A1048: UV scanner; non-self-check; for R7847C amplifier; standard industrial mount
• C7076A1001: Self-check UV scanner; 120 VAC; 1/2 in. NPT; RM7800/RM7840 compatible
• C7076C1004: Self-check UV scanner; 240 VAC; 1/2 in. NPT; international voltage variant
• C7076D1009: Self-check UV scanner; 24 VDC; low-voltage BMS applications
• C7012A1144: UV/IR combined flame scanner; dual-spectrum detection; high false-alarm immunity
• C7012C1109: UV/IR scanner; self-check; for R7849 amplifier; refinery-grade construction
• C7015A1023: UV scanner; high-temperature housing; up to 125°C ambient; kiln and furnace applications

Flame Amplifier Modules (paired with UV scanners)

• R7847A1042: Flame amplifier; UV input; plug-in module for RM7800 relay base
• R7847B1017: Flame amplifier; UV self-check input; RM7800 series; 15-second recycle
• R7848A1005: Flame amplifier; UV/IR input; dual-scanner capability; RM7800 compatible
• R7849A1023: Flame amplifier; UV self-check; 4-second flame failure response; RM7840 base
• R7861A1026: Flame signal processor; UV/IR; analog output 4–20 mA; diagnostic display

Relay Modules / Burner Controllers (system context)

• RM7800L1087: Burner management relay module; 120 VAC; single-burner; RM7800 platform base unit
• RM7840L1075: Expanded BMS relay module; 120 VAC; pre/post-purge timing; RM7840 platform
• RM7890A1010: Modular BMS controller; 120 VAC; expanded I/O; for complex multi-burner systems

Sourcing Hard-to-Find & Obsolete Honeywell UV Flame Sensor Parts

The Honeywell RM7800 platform and its associated UV scanner assemblies — including the 113228/U, C7027A, C7035A, and C7076 series — are in the mature-to-end-of-active-production phase of their product lifecycle. Honeywell has progressively transitioned new BMS installations toward the Safety Manager and Experion Safety platforms, while the installed base of RM7800-based systems in refineries, chemical plants, and power stations continues to require ongoing spare parts support for periods of 10–25 years post-installation.

Quality Control for the Honeywell UV Flame Sensor Range

UV flame sensor assemblies present specific test challenges due to their UV-tube degradation characteristics, self-check circuit integrity requirements, and sensitivity calibration dependencies. DriveKNMS applies the following test protocol to all Honeywell UV scanner units prior to dispatch: