QRA73.A27 Siemens Detector

Overview

The Siemens QRA73.A27 is a high-performance, self-checking ultraviolet (UV) flame detector designed for the continuous supervision of gas or oil flames and for ignition spark proving. Engineered for use in industrial and commercial burner systems, this sensor is a critical safety component that ensures reliable flame presence detection. It is specifically designed to work with Siemens burner management systems, such as the LMV5 and LME75 series, providing fail-safe operation by periodically verifying its own sensitivity through an integrated shutter mechanism.

Features

• Self-checking mechanism with an integrated stepper motor and swivelling shutter for continuous operation without safety interruptions
• Normal sensitivity UV photodiode optimized for gas flames and blue or yellow burning oil flames
• Robust construction with a quartz-glass window protecting the sensor tube against dirt and debris
• IP65 protection rating ensuring high reliability in demanding industrial environments
• Compact design with metal-plated housing to prevent static charging from burner fans
• Compatible with AGG16.C adapters for flexible mounting on burners or viewing tubes

Specifications

• Model: QRA73.A27
• Mains Voltage: AC 230 V (50/60 Hz)
• Detector Tube Length: 125 mm
• Sensitivity: Normal
• Spectral Sensitivity: 190 to 270 nm
• Protection Class: IP65
• Operating Temperature: -20 C to +60 C
• Weight: Approximately 0.70 kg to 0.87 kg
• Average Service Life: 10,000 hours (at ambient temperatures below 50 C)

Applications

• Supervision of gas flames and yellow or blue burning oil flames in industrial burners
• Ignition spark proving in high-demand combustion systems
• Integration into Siemens LMV5 and LME75 burner management systems
• Suitable for use in heating boilers, hot air generators, and various industrial heating processes requiring continuous flame monitoring