Capteur de flamme Siemens QRI2B2.B180B

The Siemens QRI2B2.B180B is a flame sensor, catalogue article 884.211.016. Sensors of this type are used on oil and industrial burners where the flame is luminous and must be seen directly. They detect ultraviolet or infrared radiation emitted by the flame and send a signal to the burner control to confirm that combustion has started. This signal is part of the safety sequence: the burner control must receive it within the safety time or it will lock out. When selecting a replacement sensor of this class, consider the detection principle (UV or IR), spectral range, response time, cable length and connector type, and the mounting sleeve required for the installation. Typical failure modes include a contaminated or fogged window that blocks radiation, an aged sensor cell with a weakened signal, or a broken sheath or cable. During replacement, inspect the window for dirt or cracks, check the cable and connector for damage, and ensure the sensor is correctly aligned with the flame. The mounting sleeve should be clean and free of soot or debris to allow a proper seal and correct optical path.