Siemens Qra2 Uv Flame Sensor

ENERGY COMBUSTION, Ahmadabad Importer and suppliers of Siemens make Flame Sensors. The Siemens QRA2 is a compact ultraviolet (UV) flame detector designed for intermittent operation (systems that shut down at least once every 24 hours). It is one of the most common sensors in the Siemens lineup, widely used for supervising gas flames, yellow/blue oil flames, and verifying ignition sparks. Full Technical Specifications Feature Specification Detection Type Ultraviolet (UV) Spectral Sensitivity 190 to 270 nm Operating Mode Intermittent Operation only Sensitivity Normal (Standard) Operating Voltage AC 220–240 V (via burner control) Protection Rating IP40 (Indoor use, protected against solid objects >1mm) Operating Temperature -20 °C to +60 °C Average Life of UV Cell Approx. 10,000 hours (at 50 °C) Housing Material Metallized plastic (prevents static charging from fan air) Weight Approx. 60 g (Lightweight) Replacement UV Cell AGR4 502 1131 0 Variants & Sensitivity The QRA2 series is identified by its terminal cover color, which indicates its sensitivity level: QRA2 (Black Cover): Normal sensitivity. QRA2M (Green Cover): High sensitivity, used for smaller flames or longer viewing distances. QRA2.9: Features a heat-resistant housing for short-term ambient temperatures up to 200 °C. Model Suffixes (Mounting Options) QRA2: Basic unit without mounting flange or clamp. QRA2(1): Supplied with a mounting flange and clamp. QRA2(2): Specifically refers to the plastic housing variant (standard). Compatible Burner Controls The QRA2 is highly versatile and works with almost all Siemens/Landis & Staefa control boxes. In some cases, an ancillary unit (adapter) is required to convert the signal: Direct Connection: LFL, LAL, LGI16, LGK16. With Adapter AGQ1/AGQ2/AGQ3: LGB2, LGB4, LMG, LME21, LME22, LME39, LMV2, LMV3. Important Installation Notes Static Charge: The plastic housing is "metallized" (coated) to prevent the build-up of static electricity caused by the air flow from the burner fan. Do not paint over this housing. Interference: Like all UV sensors, the QRA2 can be triggered by UV radiation from sources other than the flame, such as ignition sparks, welding arcs, or high-intensity halogen lamps. Ensure it is aimed strictly at the flame. Mounting Torque: When tightening the housing screws, the maximum torque is 0.3 Nm