Honeywell C7027A1049 UV Flame Sensor – Obsolete Sensing & Combustion Spare Part

Technical Dossier

Product Details And Specifications

Honeywell C7027A1049 UV Flame Sensor – Obsolete Sensing & Combustion Spare Part

RFQ support for obsolete parts: Send the model number, required quantity and destination so DriveKNMS can confirm sourcing options before quotation.

Technical Specifications

Note: Electrical parameters (supply voltage, spectral response range, response time) are not published here to prevent specification errors. Confirmed data is provided upon request with the original Honeywell datasheet.

Solving the Discontinued Hardware Crisis

The C7027A1049 was designed as a direct-mount UV sensor for Honeywell's legacy flame supervision relay and programmer product lines. These control systems were engineered to exacting safety standards and have accumulated decades of validated operational history in critical combustion processes. The sensor's UV detection principle — immune to visible light interference and capable of detecting hydrocarbon, hydrogen, and other industrial flames — made it the specified component for applications where false-flame or flame-loss errors carry serious safety and regulatory consequences.

For plant engineering and maintenance managers operating under capital expenditure constraints, the arithmetic is straightforward. A single verified C7027A1049 spare, properly stored, can defer a six- or seven-figure system replacement for five to ten years. The condition of the broader burner control system — not the sensor alone — determines the realistic service life extension. In systems where the R4140 or R7140 programmer, wiring, and combustion air controls remain serviceable, a sensor replacement restores full system function without any software reconfiguration, safety revalidation, or process interruption beyond the physical swap.

Condition & Reliability Assurance

DriveKNMS applies a five-stage quality process to all obsolete and legacy spare parts before dispatch review.

Stage 1 – Visual and Mechanical Inspection: Physical examination of the sensor body, mounting flange, and electrical connector for corrosion, mechanical damage, and UV window integrity. Parts with compromised UV windows are rejected — a degraded window directly reduces flame detection sensitivity.

Stage 2 – Electrolytic Capacitor Assessment: For any associated control circuitry, electrolytic capacitors are evaluated for age-related degradation. Capacitor failure is the leading cause of intermittent faults in legacy electronic components stored beyond ten years.

Stage 3 – Pin and Connector Inspection: All electrical contacts are inspected under magnification for oxidation, pitting, and mechanical deformation. Contact resistance is verified to be within specification before the part is cleared.

Stage 4 – Firmware and Labeling Verification: Part number, date code, and revision markings are cross-referenced against Honeywell's published part genealogy to confirm authenticity and revision compatibility with the target controller.

Stage 5 – Functional Documentation: Each unit is shipped with a condition report documenting the inspection findings, the specific revision identified, and any observations relevant to installation in the customer's system configuration.

Key Features for System Maintenance

The C7027A1049 is a direct drop-in replacement for the original sensor position in all compatible Honeywell burner control systems. No firmware changes, no controller reconfiguration, and no safety interlock revalidation are required beyond the standard recommissioning procedure specified in the original Honeywell installation manual. This is the defining advantage of sourcing the correct obsolete part versus pursuing a cross-reference or modern substitute: the engineering risk is zero, and the maintenance technician's existing knowledge of the system remains fully applicable.

Can this sensor be used with modern Honeywell controllers?
Compatibility depends on the specific controller model. The C7027A1049 was specified for the legacy Flame-Monitor and Protectorelay product lines. Customers considering use with any controller outside the original specification should consult Honeywell's cross-reference documentation or contact DriveKNMS for application support before ordering.