This level switch uses a metal tuning fork
structure to detect the presence of a liquid or solid (powder or granules) in a
vessel.
An electronic circuit continuously excites the
tuning fork, causing it to mechanically vibrate. When the prongs of the fork
contact anything with substantial mass, the resonant frequency of the structure
dramatically decreases. The circuit detects this change and indicates the
presence of material contacting the fork. The fork’s vibrating motion tends to
shake off any accumulated material such that this style of level switch tends
to be resistant to fouling.
You can also read: Ultrasonic Level Switches
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