Siemens Industry, Inc. QRA55.E27 HVAC Flame Detector

Siemens QRA55.E27 UV flame detector is a continuous‑operation flame-sensing device designed to supervise gas- and oil-fired flames in HVAC equipment, providing reliable flame detection for burner safety circuits. It operates on 220–240 V AC and uses a UV sensor with normal sensitivity (E27), featuring a 125 mm detector-tube length and a 69 mm head diameter for compact installation near the burner or through a viewing tube. The unit supports mounting directly on the burner, in a viewing-tube assembly, or at a combustion chamber viewing hole, offering flexible integration across a range of HVAC configurations. Typical applications include supervision of gas flames and ignition spark proving in commercial and industrial HVAC systems, where continuous flame monitoring is required to support safe startup and operation. A spare UV tube is listed as AGR450240650, and documentation confirms the E27 variant of the QRA55 family with these specifications.