Brahma Phototransistor FT11/A 18209009

The Brahma FT11/A is a flame sensor that uses a phototransistor to detect the presence of a flame by sensing its light. It is designed for use in burners where the flame is luminous and the sensor must have a direct line of sight to the combustion zone. This model has a cable length of 620 mm, which determines the distance between the sensor and the burner control. It features high heat resistance and durable insulation, making it suitable for demanding environments.

When selecting a replacement phototransistor, ensure that the detection principle matches the original (phototransistor, photodiode, or UV cell). The spectral response range, response time, and connector type must be compatible with the burner control. The cable length should be sufficient to reach the control unit, and the mounting sleeve must fit the burner or sight tube. Before installation, verify that the sensor's window is clean and that it is aimed directly at the combustion zone.

Common failures include a contaminated or fogged window, which reduces sensitivity, or a weakened cell that produces an unreliable signal. A broken cable sheath can cause intermittent or no signal. When these occur, the burner may fail to ignite, shut down unexpectedly, or lock out. Check the sensor's window for dirt or damage, and inspect the cable for wear or breaks.