Vibrating Fork Level Switches for Liquids
The KOBOLD NWS Vibrating Fork Level Switch is compatible with non-coating and some coating media with viscosities up to 5,000 cSt. Sample application media includes oils and foamed oils, water, paints, transparent inks, sauces, milk, and liquids with carbon dioxide. It also suitable for sterile or hygienic applications and CIP cycles up to 300 °F. The NWS can be set as an upper or lower limiter with the integral mode selector. It also features an LED output state status indicator.
Vibrating Fork Level Switch Principle of Operation
The NWS Vibrating Fork Level Switch works on the vibrating fork principle. A piezoelectric crystal is matched to the frequency of the tuning fork in air and is used to set the fork vibrating. When the fork is immersed in liquid, its resonant frequency changes. The piezoelectric crystal is then no longer matched to the tuning fork, which causes the vibration to stop. The NWS’s internal electronics detect this change and signal an alarm condition.
Solid State Switch with 2-wire or 3-wire Modes
The switching logic is easily toggled between N/O and N/C through an internal switch. The NWS is available with a solid-state switch that may be used in a 2-wire or 3-wire mode. The 2-wire configuration can switch loads up to 240 VAC at 0.5 amps, while the 3-wire system switches a DC voltage when activated.
Compact Plastic Vibrating Fork Level Switch
KOBOLD also offers the compact NWP Plastic Vibrating Fork Level Switch that is ideal for more aggressive media.
Product Specifications
Contact
1 Electronic Switch
Fittings
¾" NPT, 1" NPT, 1-1/2" or 2" Tri-Clamp, 1" or 2" ANSI Flange
Max. Pressure
650 PSIG @ 265 °F
Max. Temperature
265 °F (130 °C)
Product Features
User Selectable Switch Logic
Sterile or Hygienic Applications
Sample Application Media Includes Oils and Foamed Oils, Water, Paints, Transparent Inks, Sauces, Milk, and Liquids with Carbon Dioxide
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