ALLE KATEGORIENDifferent sensors applications of Littelfuse
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Veröffentlichungszeit: 2020-03-02 Größe: 3548 Kb Format: PDF Heruntergeladen: 0
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Einführung
Appliances like refrigerators, freezers and wine coolers are used to keep food/beverages cold and extend their useful life. These appliances contain lights to illuminate the inside compartments when the doors are open. However, the lights only need to turn on when a door is open. To accomplish this, a proximity sensor is needed to detect if the appliance door is open or closed.
A reed sensor can be used to detect the position of the door. In refrigerators, a reed sensor is mounted to the frame of the appliance and a permanent magnet is mounted to each door. Each reed sensor and magnet pair is positioned so that the reed switch contacts close only when the door is completely closed.
The position of the reed sensor’s contacts can be monitored by an electronic control unit (ECU) within the refrigerator’s electronics assembly to turn the interior lights on and off as needed. Reed sensors are ideal for a variety of position- and proximity-sensing applications where there is a need to detect the presence of a moving part in relation to a sensor in a fixed location.