Model ALV 830 – General Purpose

For most of typical applications

This simple to use vibrating fork level switch offers all the essential features. This instrument is also available in remote version.

Features

  • Calibration free and easy installation.
  • Insensitive to material build-up.
  • Field selectable fail safe mode.
  • Adjustable time delay.
  • Meets International Standards
  • Built-in Diagnostics
  • Customer specified insertion lengths up to 6m with cable or pipe extensions.
  • Compact as well as remote mounted versions available
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  • Ex
  • Technical Specifications
  • Applications
  • Operating Principle
  • Other Models
  • Mains supply : 85 Vac to 265 Vac
  • Output : Relay, Open collector
  • Time delay : 2 to 30 sec adjustable
  • Response Time : < 1sec
  • Fork Vibrating Frequency : 80 Hz ± 5 Hz
  • Ambient temperature : -20 to 60° C
  • Process temperature : up to 80° C; Optional: up to 150° C
  • Housing : Cast Aluminium  
  • Protection : IP 67
  • Dry Powders – Cement, Pulverized coal, Coffee Powder, Milk Powder, Chemical Powder
  • Fine Grained Solids – Food Grains, Plastic Pellets, Wood

A low frequency signal is used to vibrate the piezo-electric crystal. The crystals connected to the tines of the fork cause them to vibrate. On contact with the material, these vibrations get damped. The attenuation in the vibrations is sensed by the electronics that generates an alarm.