Siemens Flame sensor QRB1A-A050B70A2

This is a flame sensor made by Siemens for flame detection. It uses a photosensor as the sensing element. The cable length is 500 mm. The sensor has OEM equivalents 04036440 and 3980N560, and is intended for a Lamborghini 04036440 burner.

For this type of flame sensor, selection must match the detection principle (UV or IR), spectral range, response time, cable length, connector type, and mounting sleeve of the original. Before ordering, measure the existing cable length and confirm the connector configuration. Installation requires the sensor to have a clear view of the flame, and the window must be clean at the time of mounting.

Typical failures include a contaminated window, a weakened signal from an aged sensor cell, or a broken protective sheath. These faults may prevent flame detection, so the burner control will not receive a signal within the safety time and will go into lockout. When this happens, inspect the sensor window for dirt or cracks, and check the cable and sheath for damage.