Level Switch
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Level Switch A level switch is a device that senses the level of a liquid in a water tank. It is a specialized type of pressure switch, which is capable of sensing pressure with a plastic tube. In a washtub, for example, the plastic tube runs from the level switch within the control console and continues down the outside of the tub’s bottom. The plastic tube in a level switch is filled with air. In the example of the tub, the water enters the inside of the tub, and some of it gets into the plastic tube. The water in the plastic tube then climbs and places pressure on the air inside. In turn, this causes the air pressure to increase. Ultimately, the air pressure reaches a point at which it triggers the switch. A level switch is usually available in both small and large sizes. In addition, these devices can range from simple to very intricate designs. The simplest form of level switch involves a mercury switch located inside a hinged float. A more complicated model utilizes complex sensors. In general, these switches are adjustable. It is also possible to purchase a two-stage level switch. This can be quite handy because it can prevent flooding. |
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