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Vibrating Fork
Low Bulk Density materials

NIVOSWITCH vibrating fork level switches are suitable for level detection
of liquids or granular, powdered solids. Units with parallel vibrating fork are
suitable for liquids, units with non parallel vibrating fork are suitable for
solids. Mounted on pipes, silos, tanks or hopper bins filling / emptying can
be controlled using these devices just as well they can generate fail-safe
alarms providing overfill- or dry run protection.
The operation principle is based on the electronic circuit exciting the fork
probe making it vibrate. As the medium reaches and covers the fork its
vibration changes, or stops. The fork will start vibrating again as the medium
sets it free. The electronics senses the change of vibration and gives output
signal after a selected delay.
Plastic coated version is recommended in aggressive mediums, highly
polished version is recommended for abrasive mediums. The PNP/NPN
transistor output versions can be connected directly to PLC, or relay unit.
The NIVOSWITCHvibrating forks are able to solve switching tasks of highcurrent loads with the help of UNICONT PKK switching amplifiers.
The UNICONT PKK-312-8 Exintrinsically safe switching unit is designed
to serve Ex rated vibrating forks. 


  • Compact and mini compact type
  • Rod extension up to 3 meters
  • Plastic (PFA) coated version (option)
  • Polished vibrating part
  • Switching performance does not depend on the change of liquid conductivity, dielectric constant, viscosity, pressure and temperature
  • Selectable sensitivity
  • Relay or electronic output
  • Hygienic versions with various process connections and 0.5 micron fine polishing (option)
  • Medium temperature max. 130°C
  • Output test with optional test magnet
  • IP 67, 65/68 protection