Brahma FC Flame Sensors – Reliable Light-Resistant Detection for Oil Burners

The Brahma FC series flame sensors are designed for use in oil burner systems, providing stable flame detection through photoresistor technology. These devices respond to the light intensity of the flame and are widely used in conjunction with ignition transformers and control boxes. With various models offering different lengths, filters, and housings, the FC line meets the demands of both domestic and industrial burner setups.

They are compatible with most Brahma control boxes including TGR, VM, GR, OR, and OS models, and may also be integrated with other manufacturers’ systems when matching signal specifications. For an overview of options, view Brahma flame sensors in the catalog.

Working Principle

FC sensors operate by detecting visible light generated by the flame. The internal photoresistor changes resistance when exposed to light, which is interpreted by the burner control unit as flame presence. Unlike UV sensors, these models do not require an external power supply and contain no active electronics — making them simple and durable.

Sensors are tuned to the visible spectrum (typically 300–700 nm), with some models featuring built-in filters to eliminate background light or reflection interference from ignition sparks or other sources.

Applications

The Brahma FC series is optimized for use in oil-fired heating systems, particularly those with yellow or bright flames. Their fast response time and stable output make them a dependable choice for:

• Oil burners in domestic boilers
• Mobile diesel heaters and cannons
• Steam and hot water generators
• Industrial furnaces and drying systems

Design and Build

FC photoresistors come in durable plastic or aluminum housings, with or without integrated shielding. Cable lengths vary from 300 mm to 1,000 mm depending on the model. Standard wiring is two-conductor, with PVC insulation suitable for high-temperature applications.

Model Comparison

• FC7 / FC8 – Compact, basic models with standard optics
• FC9 – Enhanced with light filter, recommended for industrial use
• FC11 / FC13 – With outer protective casing
• FC14 / FC14L – Long-body variants with improved optics and housing

Connection and Integration

All FC models use a two-wire connection. One lead is grounded and the other connects to the flame input on the control unit. Polarity is generally not critical, though it’s recommended to follow manufacturer instructions. They can be wired to screw terminals or directly onto control board headers.

Conclusion

Brahma FC flame sensors are a time-tested solution for detecting flame presence in oil-fired systems. Their reliability, simplicity, and variety of formats make them suitable for OEM and replacement use alike. Browse our complete range of flame detection components to select the model that fits your needs.