مستشعر اللهب Siemens QRB1B-B036A25A

IR flame sensor Siemens QRB1B-B036A25A (art. 972.211.007) This is a photoresistive flame sensor Siemens, designed to monitor the presence of flame in burners operating on liquid fuel (diesel, fuel oil) with a yellow flame. The device detects flame radiation in the visible light spectrum and transmits a signal to the automation unit, ensuring safe burner operation. If your burner starts but turns off after a few seconds in emergency mode (lockout), the cause is often a malfunction of this sensor. Technical specifications Parameter Value Part numbers QRB1B-B036A25A, 972.211.007 Manufacturer Siemens (Germany) Sensor type Photoresistive (IR) Housing length 65 mm Cable length 360 mm Stripped cable length (m) 25 mm Viewing direction Front and side (90°) Sensitivity High Protection class IP40 Operating temperature from -20°C to +60°C Mounting Via flange (purchased separately) Weight 0.023 kg Warranty period 5 years (according to Siemens price list) Compatibility The QRB1B-B036A25A sensor is compatible with Siemens burner automation of the following series: LAL... LME7... LMO... LMV... LOA... ⚙️ Signs of malfunction Replacement of the flame sensor is required for the following symptoms: Burner does not start (no flame signal) Burner starts but turns off after 5-10 seconds in emergency mode (lockout) — sensor does not see the flame Unstable operation — frequent false trips and shutdowns Visual defects — cracks in the housing, contamination of the photoresistor (soot, dust), cable damage ⚠️ Application features Important: The sensor is supplied without a mounting flange and clamping bracket. For installation, you will need to purchase them separately. Also, the sensor can detect radiation from the hot refractory brick of the combustion chamber, so during installation, you should