China Photocell QRA2 | Flame Detector

The QRA2 flame detector is designed for the supervision of gas flames, yellow- or blue-burning oil flames, and ignition spark proving. It utilizes UV radiation for generating a flame signal and ensures reliable operation in various conditions.

Operation

• Flame Supervision: Utilizes UV radiation emitted by gas or oil flames.
• UV-Sensitive Cell: Contains 2 electrodes that ignite when exposed to radiation in the 190–270 nm range, triggering a current in the flame detector circuit.
• Selective Response: Does not respond to glowing firebrick in the combustion chamber, daylight, or boiler room illumination.

Mechanical Design

• Housing: Metalized plastic housing to prevent static discharge caused by airflow from the fan.
• Mounting: Direct mounting on the burner, with or without securing the flange and clamp.
• Terminal Cover: Black terminal cover for protection.

Technical Specifications

• Sensitivity: Normal
• UV Life Expectancy: Approximately 10,000 hours at a maximum of 50 °C; higher ambient temperatures significantly reduce the cell’s life.
• Permissible Combustion Chamber Pressure: Max. 50mbar
• Degree of Protection: IP40
• Mounting Position: Optional
• Weight: Approx. 60g
• Ignition Cable: 2 x 0.75 mm²; 5.1 mm diameter
• Temperature Range: -20 to +60 °C
• Humidity: < 95 % R.H.
• Usage: Intermittent use