NIVOSWITCH Series, Vibrating Fork Level Switch

NIVOSWITCH Series, Vibrating Fork Level Switch

Product Overview

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 and emptying can be controlled using these devices; also they can generate fail-safe alarms providing overfill or dry run protection.

Vibrating Fork Level Switch
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.

  • Compact and mini compact type
  • Rod extension up to 10 feet
  • Polished vibrating part
  • Switching performance does not depend on the change of liquid conductivity, dielectric constant, pressure, and temperature
  • Hygienic versions with various process connections and 0.5 micron fine polishing
  • Adjustable sensitivity
  • Relay or electronic output
  • Medium temperature maximum 266 °F
  • Output test with optional test magnet
  • IP67, IP65/IP68 protection

Description

  • No moving parts
  • Self-cleaning in most mediums
  • Stainless steel and plastic-coated probes
  • Pipe extension up to 10 feet
  • Various output configurations
  • High or low fail-safe mode
  • Plastic, aliminum or stainless steel housing
  • Explosion-proof variants available
  • For corrosive, thick, turbulent, flowing liquids
  • Medium pressure: up to 580 psig
  • 3 year warranty

Applications

  • Most liquids with minimum 0.7 specific gravity and maximum 0.1 ft²/s viscosity
  • Chemical industry
  • Food and beverage
  • Power plants
  • Oil industry
  • Water industry
  • For liquids: minimum 700 oz/ft3 density and maximum 104 0.1 ft2/s viscosity
  • For solids: minimum 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 dry run protection, pump controls

NIVOSWITCH Series Vibrating Fork Level Switch Model Line-Up

Type selection is aided by this table for choosing the proper version to a given level switching task. Most essential aspect is the consistency (liquid or solid) of the measurement medium.

For liquids

For solids

Features

Mini compact

Compact

Mini compact

Compact

Metal housing

X X X X

Plastic housing

X X

Extension

X X X X

Highly polished version

X X

Plastic coated fork

X X

1″, 11⁄2″ process connection

X X X X

2″ process connection

X X

Relay output

X X

Electronic output

X X

Electrical connection

Terminal

X X

DIN connector

X X

M12 connector

X

Cable

X X

Intrinsically safe version
(Ex ia)

X

Flameproof enclosure
(Ex d)

X

Dust explosion proof version
(Ex ta/tb IIIC)

X

DNV GL

X

Fail-safe setting 
(low-high level)

X*

X

X*

X

Function indication

X X X X

Density selection

X X

Output test magnet

X X

*Only for 3-wire DC versions