Honeywell R7861A1026 – Ultraviolet Flame Amplifier | 7800 Series Burner Control Platform
Engineering Background: The Honeywell R7861A1026 is a plug-in ultraviolet (UV) flame amplifier designed exclusively for use with Honeywell’s 7800 Series Burner Management Systems (BMS). It serves as the signal-processing interface between UV flame detectors and the primary burner control relay module, providing reliable flame presence verification in industrial and commercial combustion systems.
Product Positioning: Targeted at combustion engineers, OEM panel builders, and maintenance teams managing boilers, burners, furnaces, and process heaters, the R7861A1026 delivers proven UV flame signal amplification with fast response and high noise immunity — a critical safety component in any 7800-series controlled combustion loop.
Complete Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | R7861A1026 |
| Series / Platform | Honeywell 7800 Series Burner Management |
| Module Type | Plug-in UV Flame Amplifier |
| Flame Detection Method | Ultraviolet (UV) |
| Compatible Detectors | C7027, C7035, C7044 UV Scanners |
| Compatible Controls | RM7800, RM7840, RM7890, BC7000 Series |
| Supply Voltage | 120 VAC / 240 VAC (via host relay module) |
| Flame Signal Output | DC microamp signal to relay module |
| Response Time | ≤ 1 second flame detection |
| Flame Failure Response | ≤ 1 second (per 7800 Series spec) |
| Operating Temperature | -40°C to +60°C (-40°F to +140°F) |
| Mounting | Plug-in to 7800 Series relay module amplifier socket |
| Approvals | UL Listed, CSA Certified, CE Marked |
| Weight | Approx. 300 g |
| Country of Origin | USA / Global Honeywell Manufacturing |
Proven Application Environments
- Industrial Boilers: Steam and hot water boilers in power generation, chemical, and food processing plants requiring certified UV flame supervision.
- Process Burners & Furnaces: High-temperature industrial furnaces, kilns, and process heaters where UV detection outperforms IR in high-luminosity flame environments.
- Commercial HVAC Heating: Large commercial boiler rooms and district heating systems using 7800 Series BMS panels.
- OEM Burner Panels: Factory-built burner management panels for gas, oil, and dual-fuel burner assemblies.
- Retrofit & Upgrade Projects: Direct plug-in replacement for aging R7847, R7848, or R7849 amplifier modules in existing 7800 Series installations.
Engineering Advantages
- UV-Specific Detection: Ultraviolet sensing is immune to background infrared radiation from hot refractory walls, eliminating false flame signals common with IR amplifiers in high-temperature environments.
- Plug-In Architecture: Tool-free installation into the 7800 Series relay module amplifier socket — no field wiring required for the amplifier itself, reducing commissioning time and error risk.
- Fast Flame Failure Response: Sub-second flame loss detection ensures the burner control initiates lockout within the safety time window defined by EN 298 / NFPA 85 standards.
- High Noise Immunity: Designed to reject electrical interference from variable-frequency drives (VFDs), contactors, and other industrial noise sources common in plant environments.
- Long Service Life: Solid-state UV signal processing with no moving parts; designed for continuous duty in 24/7 industrial combustion applications.
System Architecture & Signal Flow
The R7861A1026 operates within the following signal chain:
- UV Scanner (e.g., C7027A): Detects UV photons emitted by the burner flame and generates a pulsed electrical signal.
- R7861A1026 Amplifier: Receives the scanner signal via the relay module socket, amplifies and conditions the UV pulse train, and outputs a DC microamp flame signal to the relay module logic.
- 7800 Series Relay Module (e.g., RM7840L): Reads the amplifier output; if flame signal exceeds threshold, the module confirms flame presence and maintains burner run status. Loss of signal triggers safety lockout.
- Burner Control Sequence: The relay module manages the full purge → ignition → run → shutdown sequence, with the R7861A1026 providing continuous flame supervision throughout the run cycle.
Sourcing & Quality Verification
- All R7861A1026 units sourced by Konmask.com are genuine Honeywell product — no grey-market, counterfeit, or refurbished units.
- Each unit ships with original Honeywell packaging and traceable lot documentation where available.
- Pre-shipment inspection includes visual check, label verification, and connector integrity test.
- Konmask maintains stock of critical 7800 Series amplifier modules to support urgent MRO and shutdown-maintenance requirements.
- Export compliance: units are shipped in accordance with applicable export control regulations (EAR/ECCN classification verified).
Procurement Process
- Confirm Compatibility: Verify your 7800 Series relay module model number (e.g., RM7840L1018) and existing scanner type (UV/IR) before ordering.
- Request a Quote: Contact support@konmask.com for volume pricing, lead time confirmation, and export documentation.
- Place Order: Add to cart and complete checkout, or submit a PO via email for B2B net-terms orders.
- Shipping: Standard international express (DHL/FedEx) with full tracking. Expedited options available for shutdown-critical orders.
- After-Sales: Technical support available for installation verification and compatibility questions post-delivery.
Technical FAQ
Q: What is the difference between R7861A1026 and R7847A1042?
A: The R7861A1026 is a UV amplifier; the R7847A1042 is an IR (infrared) amplifier. Both are plug-in modules for the 7800 Series but are not interchangeable — selection depends on your scanner type (UV vs. IR).
Q: Can the R7861A1026 be used with the RM7890 Series?
A: Yes. The R7861A1026 is compatible with all standard 7800 Series relay modules that feature the amplifier plug-in socket, including RM7800, RM7840, and RM7890 families.
Q: Is the R7861A1026 suitable for dual-fuel burners?
A: Yes, provided the UV scanner has a clear line-of-sight to the flame on both gas and oil firing modes. UV detection is effective for both gas and oil flames.
Q: What happens if the amplifier fails in service?
A: Loss of flame signal causes the 7800 Series relay module to initiate safety lockout. The plug-in design allows rapid field replacement without tools or rewiring — a spare R7861A1026 should be kept on-site for critical installations.
Q: Does Konmask provide a warranty on this product?
A: Yes. Konmask.com provides a standard warranty covering manufacturing defects. Contact support@konmask.com for warranty terms and RMA procedures.
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