The Siemens QRA53.E27 is a continuous-operation UV flame detector designed for supervising gas flames, yellow- or blue-burning oil flames, and ignition spark proving on larger industrial burners. Its die-cast aluminium housing carries a 125 mm detector tube with a quartz-glass window and bayonet-fit 1" mounting coupling, fixed to the burner via a mounting bracket, with a removable Pg cable gland for the AGM19 connecting cable. Rated IP54 (IP65 with the optional AGG06 glass holder) for ambient temperatures of -20°C to +60°C and up to 500 mbar combustion chamber pressure with the AGG02/AGG03 accessory, it runs on AC 220-240V and offers a nominal UV cell life of around 10,000 hours at 50°C. Made in Germany by Siemens, it is designed for continuous-operation burner controls such as the LGK16 and LGI16 series.
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