Northlight Parade, Brierfield, Nelson, BB9 5EG / UK
+44 (0) 7858 476987

Vibrating Fork / 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 freely 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.


  • No moving parts
  • Self-cleaning in most mediums
  • Stainless steel and plasticcoated probes
  • Rod extension up to 3 m
  • Various output configurations
  • High or low fail-safe mode
  • Plastic, aluminum or Stainless steel housing
  • Explosion-proof variants available
  • For corrosive, thick, turbulent, flowing liquids
  • Medium pressure: up to 40 bar, RU type: up to 100 bar


  • Most liquids with minimum 0.7 kg/dm³ density and maximum 10⁴ mm²/s viscosity
  • Chemical industry
  • Food and beverage
  • Power plants
  • Oil industry
  • Water industry


Power supply:20…255 V AC, 20…60 V DC
Ambient temperature:−40 °C…+70 °C
Process temperature:−40 °C…+130 °C
Process pressure:up to 40 bar (100 bar)
Output:1 or 2 relays (SPDT), 2-wire AC / DC, transistor (PNP, NPN)
Process connection:1″, 1½”, 2″ or flanges or hygienic fittings
Ingress protection:IP67, IP68, IP65
Approvals:ATEX, IEC Ex, FM, DNV GL (Marine)


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