NIVOSWITCH for Liquids


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 NIVOSWITCH vibrating forks are able to solve switching tasks of highcurrent loads with the help of UNICONT PKK switching amplifiers. The UNICONT PKK-312-8 Ex intrinsically safe switching unit is designed to serve Ex rated vibrating forks.




  • Compact and mini compact type
  • Rod extension up to 3 meters (10 feet)
  • Chemical resistance plastic (PFA) coated version
  • Polished vibrating part
  • Hygienic versions with various process connections
    and 0.5 micron fine polishing
  • Adjustable sensitivity
  • Relay or electronic output
  • Switching performance does not depend on the
    change of liquid conductivity, dielectric constant,
    pressure and temperature
  • Medium temperature max. +130 °C (266 °F)
  • Output test with optional test magnet
  • Ex, FM, CSA and DNV GL versions
  • IP67, IP65 / IP68 protection


  • For liquids: minimum 0.7 kg/dm3 (700 oz/ft3) density
    and maximum 10⁴ mm2/s (0.1 ft2/s) viscosity, for solids: minimum 0.01 kg/dm3 (10 oz/ft3) density
  • For liquids / free-flowing, powdered solids, granules
  • For normal or hazardous, aggressive (acids, solvents) liquids
    or high viscosity liquids
  • Covers a large variety of level detection applications such as high/low fail-safe limit switch or dryrun protection, pump controls

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