The detector’s UV cell is located behind a swiveling shutter at the front end of the detector tube which is flanged to the housing. A quartz-glass window protects the tube and the shutter against dirt. The detector’s housing accommodates a stepper motor to drive the shutter and the electronics to control the shutter. QRA5/QRA7 series E and G differ with regard to the closing interval of the orifice. Using the AGG16.C adapter, this flame detectors can be mounted either directly on the burner, on a viewing tube or on a combustion chamber viewing hole.
Type reference Sensitivity Detector tube length Mains voltage Spare UV tube
QRA53.E27 Normal 125 mm AC 220...240 V AGR 4 502 4065 0
QRA53.E17 Normal 125 mm AC 100...110 V AGR 4 502 4065 0
QRA53.G27 High 125 mm AC 220...240 V AGR 4 502 4065 0
QRA53.G17 High 125 mm AC 100...110 V AGR 4 502 4065 0
QRA55.E27 Normal 69 mm AC 220...240 V AGR 4 502 4065 0
QRA55.E17 Normal 69 mm AC 100...110 V AGR 4 502 4065 0
QRA55.G27 High 69 mm AC 220...240 V AGR 4 502 4065 0
QRA55.G17 High 69 mm AC 100...110 V AGR 4 502 4065 0
QRA73.A27 Normal 125 mm AC 230 V AGR 4 502 4065 0
QRA73.A17 Normal 125 mm AC 120 V AGR 4 502 4065 0
QRA75.A27 Normal 69 mm AC 230 V AGR 4 502 4065 0
QRA75.A17 Normal 69 mm AC 120 V AGR 4 502 4065 0
Siemens UV Detector QRA5 QRA7
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