Siemens Flame sensor QRC1A2.103C27

The Siemens QRC1A2.103C27 is a flame sensor designed as a photodetector for monitoring flame presence in burners. It is intended for use in automatic combustion control systems and is compatible with gas, diesel, and fuel oil fuels. The sensor features a compact design and is constructed with heat-resistant plastic, facilitating integration into burners. It provides fast response to flame loss and operates with high sensitivity for stable performance.

When selecting a replacement flame sensor of this type, ensure that the detector's operating principle (photoelectric) and mounting style (integrated into the burner) match the original. Verify compatibility with the burner control system, as sensors are chosen based on detection principle and burner type. Check the sensor's physical dimensions and connector type to ensure proper fit.

Typical failures include a contaminated or dirty sensor window, which can weaken the signal, or an aged photodetector cell producing a reduced output. When the sensor fails, the burner control may lock out due to a missing flame signal, preventing fuel accumulation. Regular inspection and cleaning of the sensor lens can help avoid nuisance lockouts.