Siemens QRA4.U UV flame sensor

Siemens QRA4.U ultraviolet flame detector — a highly reliable device for monitoring the presence of a flame in industrial gas, liquid fuel and dual-fuel burners. The sensor is designed for use in automatic combustion control systems and ensures safe operation of boiler and thermal equipment. The Siemens QRA4.U detects ultraviolet radiation from the flame and transmits a signal to the burner control to confirm a stable combustion process. In case of flame loss, the device instantly initiates an emergency shutdown of fuel supply, which helps prevent dangerous situations and increase equipment safety. The QRA4.U model features high sensitivity, resistance to industrial interference and stable operation during long-term use. The sensor is widely used in industrial boilers, heat generators, process furnaces and drying plants where accurate and reliable flame monitoring is required. Advantages of Siemens QRA4.U: • Accurate flame monitoring via ultraviolet radiation • Fast response upon flame loss • Suitable for gas, liquid fuel and dual-fuel burners • High reliability and durability • Compatibility with Siemens burner controls • Resistance to industrial loads and interference • Easy installation and maintenance The Siemens QRA4.U ultraviolet flame detector is in demand in industrial automation and thermal power systems where safety, uninterrupted operation and stable combustion control are especially important. Using an original Siemens sensor helps minimize the risk of emergency shutdowns and increase the efficiency of burner equipment.