Sitron - Model Series VTK - Vibrating Tuning Forks Level Switch Manual

Sitron`s V-Tork Series use a piezo-electric crystal that enables the switch to vibrate at a fixed pre-defined resonant frequency. When the tuning fork is submerged in the medium the frequency at which the switch is vibrating, changes. This change is detected by the electronics and is converted into a switch output (either relay or PNP/NPN depending on the model).