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It was already clear at [[BSH Chronology 1984-2002: Sustainability and Internationalization|the beginning of the 1990s]] that BSH's old central dishwasher series, the GV60 series, had reached the end of its product life. Significant progress in the areas of consumption, dishwasher performance, quality and above all cost reductions could no longer be expected with the old series.<ref>BSH Corporate Archives, F-BSH-004, Stickel: Spülchronik, page 156. | It was already clear at [[BSH Chronology 1984-2002: Sustainability and Internationalization|the beginning of the 1990s]] that BSH's old central dishwasher series, the GV60 series, had reached the end of its product life. Significant progress in the areas of consumption, dishwasher performance, quality and above all cost reductions could no longer be expected with the old series.<ref>BSH Corporate Archives, F-BSH-004, Stickel: Spülchronik, page 156. | ||
A new series was needed. The board of management decided that the top-class dishwashers in this series should get an electronic controller, as already manufactured by [[Robert_Bosch_GmbH|Bosch]] and [[Siemens]]. The obsolete appliances still used a roller controller. Integrating a new electronic circuit board with the old roller controller did not offer any advantages however. The alternative was to use sensors to feed the signals to the electronic circuit board. The only problem was that they had not been developed as yet.<ref>BSH Corporate Archives, F-BSH-004, Stickel: Spülchronik, page 164.</ref> | |||
This posed a tantalizing challenge for the present day head of the Dishwasher Care production division Michael Rosenbauer, who was an engineer at the time in Dillingen. He recognized the potential that lay in developing these sensors. His efforts resulted in the development of a turbidity sensor that detected the degree of dirt of the water. The development was called AquaSensor – based on the successful water damage protection solution [[AquaStop – reliable protection against water damage|AquaStop]].<ref>BSH Corporate Archives, F-BSH-004, Stickel: Spülchronik, page 164.</ref> | |||
The AquaSensor was integrated in the new GV630 dishwasher series and controlled the reusage or draining of the pre-rinse water by checking the cloudiness of the water. The AquaSensor thus helped save around 20 percent of the washing water.<ref>BSH Corporate Archives, F-BSH-004, Stickel: Spülchronik, page 164.</ref> | |||
< | <span id="Funktion_des_AquaSensors"></span> | ||
==== | ===== Operation of the AquaSensor ===== | ||
An infrared LED and phototransistor were arranged opposite each other on a U-shaped board and protected by housing made from translucent plastic. This sensor was integrated in the instantaneous water heater. The infrared diode then sent its light through the flowing water to the light-sensitive base of the phototransistor, which became conductive when irradiated by light. When the water became cloudy, the light could no longer reach the diode to activate the phototransistor. The absent voltage signal was detected by the microcomputer on the electronic circuit board and this then initiated the required replacement of the water.<ref>BSH Corporate Archives, Edition Ernst Stickel (uncatalogued), drawing of the sump assembly in the GV630.</ref> | |||
A preset time and regeneration electronics were also integrated in the controller. The latter only initiated regeneration of the water softening unit with salt when this was deemed necessary based on the set water hardness level and the dishwasher programs used. This avoided unnecessary consumption of salt and regeneration water.<ref>BSH Corporate Archives, F-BSH-004, Stickel: Spülchronik, page 164.</ref> | |||
< | <span id="Bayerischer_Innovationspreis_2000"></span> | ||
==== | ===== Bavarian Innovation Prize 2000 ===== | ||
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