By H Meixner; R Jones
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Extra resources for Sensors : a comprehensive survey
What is known as “Automatic Dosing System” which was introduced to the German market some years ago was a very complex solution of the problem and used a lot of electronics. The high purchasing costs due to the high technical requirements for 3 detergent components and a fabric conditioner, and problems in detergent logistics led to the abandonment of a then highly acclaimed system. Other systems for one detergent only that were clearly simpler technically have not yet been optimized for practical consumer purposes.
This is shown in the upper part of Fig. 8. If the cold water temperature is relatively “high”, the set lower temperature limit may be exceeded, and the heating may not be switched on at all. The washing process is then carried out with cold water with accordingly poor washing results. By contrast, modern washing machines allow temperatures to be precisely controlled, virtually to the degree, through an NTC sensor. With appropriate monitoring, the set temperature can be maintained as long as required, as shown in Fig.
Electromechanical pressure switches and potentiometric level sensors have also been introduced quite early. When microelectronics and solid state devices developed over the last five to four decades, the development of solid-state sensors followed suit, resulting in the introduction of NTC and PTC resistors to monitor temperature, and first Reed relais and inductive sensors to determine position and distance, or tachometers for rotational measurements in washing machines and dish washers over the past two decades.
Sensors : a comprehensive survey by H Meixner; R Jones