QRA.. Flame Detectors

The QRA.. flame detectors are designed for use with Siemens burner controls, for the supervision of gas or oil flames.

• QRA2... Flame Detectors

  Plastic housing, metalized to prevent static charging caused by the air flow from the fan. For direct mounting on the burner. The detectors can be supplied with or without securing flange and clamp.

• QRA10... Flame Detectors

  Die-cast aluminium housing with a 1" mounting coupling (D) and a connection facility for cooling air. The housing of this detector has a bayonet fitting which allows it to be secured either directly to the 1" mounting coupling or to the AGG06 glass holder. The 1" mounting coupling can be screwed to a viewing tube or to the AGG07 ball head. The PG cable gland can be removed and replaced, if some other detector cable shall be used.

• QRA5... Flame Detectors

  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. Using the AGG16C adaptor, this flame detector can be mounted either directly on the burner, on a viewing tube or on a combustion chamber viewing hole.

QRB.. Photoresistive Detectors

The QRB.. photoresistive detectors are for use with Siemens burner controls, for the supervision of oil flames in the visible light spectrum. The flame detectors are used primarily in connection with burner controls for small burners. Available with different sensitivities

RAR... Selenium Photocell

The RAR... flame detector is for use with Siemens burner controls for the supervision of oil flames. The selenium photocell detectors are used especially in connection with burner controls controlling and supervising burners of large capacity. With this type of supervision, the radiation of oil flames in the visible band of the light spectrum is used to generate a flame signal. The light-sensitive element is a selenium photocell. When illuminated, it generates DC voltage causing a current to flow to the input of the flame signal amplifier. Hence, the selenium photocell is an active detector. The cell is insensitive to infrared radiation so that glowing firebrick in the combustion chamber cannot generate a flame signal.