QRA75.A17 Siemens Flame Detector

Overview

The Siemens QRA75.A17 is a self-checking ultraviolet (UV) flame detector designed for the supervision of gas or oil flames and for ignition spark proving. Built for continuous operation, this high-precision sensor provides a critical safety function for industrial burners by ensuring reliable flame detection and preventing potential hazards during high-demand burner cycles.

Features

• Self-checking mechanism allows for continuous flame supervision without interruption
• Normal sensitivity UV photodiode designed to detect gas flames and blue or yellow burning oil flames
• Integrated stepper motor and shutter system for periodic testing of the UV cell
• Durable plastic housing with metalization to prevent static charging from fan air flow
• Protection rating of IP65 ensures reliability in industrial environments
• Side-viewing design suitable for specific burner mounting configurations

Specifications

• Model: QRA75.A17
• Mains Voltage: AC 120 V (50/60 Hz)
• Detector Tube Length: 69 mm
• Sensitivity: Normal
• Operating Temperature: -20 C to +60 C
• Luminous Current: 1.2 mA
• Weight: Approximately 1.0 lb (0.45 kg)
• Connection: Threaded G3/4 with sealing ring

Applications

• Supervision of gas flames and yellow or blue burning oil flames
• Ignition spark proving in industrial burner systems
• Use with Siemens burner controls such as the LMV5 or LME7 series
• Continuous or high-demand burner operations in HVAC and boiler systems