Vibration Type Level Sensor
The Vibration Type Level Sensor (VLS series) is a piezoelectric driven vibration type level switch that detects the solid level in bins, silos and hoppers, filled with grained or powdered materials (bulk solids). This level sensor can be used for overfilling protection, for high- or low-level alarm.
The blade of the probe vibrates at its resonance frequency. When filling material covers the blade of the probe, the vibration stops. This is sensed by the electronic circuitry and the output relay switches. When the blade gets uncovered, the vibration will restart, and the relay will switch back.
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