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Dial Instruments Pte Ltd
Level Measurement Solutions for Petrolchemical, Pharmaceutical,
Marine & General Industries
 
Subpage :: Masthead
Vibrating Level Sensor VL

Description

Applications

Level measurement of solids, granular materials and sludge blanket
 

Features

  • Measurement is based on coil impedance detection.
  • Resists temperatures up to 150℃ as standard
  • Insensitive to temperature changes
  • Offers fail-safe switch
  • Low voltage operation
  • Detection made at the end of the detector
  • Wide sensitivity adjustment range

Principle of Operation

Principle of Operation

Measurement is based on coil impedance detection. A magnet and an electromagnet inside the detector vibrate the plate. Current that flows on the electromagnet decreases when the detector is covered by the measured material. The sensor detects this change to detect a solid presence and gives an output.
 
  • When the detector is not covered by the material
    • The electromagnet vibrates at its operating frequency when an alternating current is applied.
    • Back electromotive force on the electromagnet becomes the largest due to change in magnetic field from the magnet
    • The sensor determines the detector is not covered by the material.
  • When the detector is covered by the material
    • Applying alternating current does not cause the electromagnet to vibrate at its operating frequency.
    • No back electromotive force occurs because the magnet is stationary.
    • The sensor determines the detector is covered by the material.