326 Commissioning6.2.2 PositioningThe processes that take place in combustion result in pulsing radiation (flickering of the flame).The series of oscillations (flame frequency) involved are used for monitoring purposes. Position the aperture used for selective monitoring in such a way that the compact flamescanner/flame sensor picks up the root of the burner flame to be monitored (near themouth of the burner).NOTICE The burner flame must be well visible throughout the combustion plant's operating range. Ensure that the compact flame scanner/flame sensor does not point directly at flame thatis opposite or adjacent. This is also very important when it comes to background flames (e.g. coal, wood, waste).1. Mount the compact flame scanner/flame sensor on the burner's viewing opening. Use thecorresponding adjustable holder for this.The compact flame scanner/flame sensor is now mounted. Pay attention to the followinginstructions for alignment.WARNING!Overheating of the flame sensor / flame scannerEnsure that the max. permissible ambient temperature is not exceeded at the installation site.Due to the location where the flame scanner is installed, increased temperature can occur onthe scanner, especially with the FFS08. The operating mode of the burner or appropriate cooling measures must prevent the per-mitted operating temperature from being exceeded. If the permissible operating temperature has been exceeded, the flame scanner or flamesensor must be replaced.Measures must be taken to prevent such a situation.An overheated flame sensor or flame scanner is operated outside its specification.As a result, it is possible that the safety function is no longer active.
