A tuning fork switch comprises a two prong fork which is driven to oscillation at its natural frequency, usually by a piezo-crystal assembly. The switch is usually mounted on the side or top of a tank using a flange or threaded process connection such that the forks protrude into the tank.
These instruments are designed based on the tuning fork principle for providing point level detection for alarm, monitoring, and control applications. When in air, the tuning fork vibrates at its natural frequency, but when immersed in a particular medium, the frequency drops and provides an output state change.
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