Photocell QRB4A-B070B70A

Siemens Photoresistive Flame Detector QRB4A-B070B70A

The Siemens QRB4A-B070B70A is a photoresistive flame detector used with Siemens burner controls for supervising yellow-burning oil flames in the visible light spectrum, tuned to a peak spectral sensitivity around 600nm. Housed in a compact 68mm black casing with a 70cm cable and 70mm stripped, ferrule-ready ends, it mounts using the AGK42 flange and AGK43 clamp for a secure fit on the burner body. It is primarily used in intermittent-operation oil burner applications alongside control units such as the LAL, LME7, LMO, LMV and LOA series. It is an OEM-grade sensor built by Siemens for integration into burner and boiler flame-safety systems.