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Level Switch
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VF
Nohken Vibrating Level Sensor VF
Main application
Low limit detection of medium to large hoppers
Main feature
Flat vibration plate of 1 mm in thickness
Robust and shock resistant
Easy installation
Detection based on “pulse vibration method”
Wide sensitivity adjustable range
Fail-safe functionality
Universal power supply
Maximum 200 meter separation distance (VFS)
Principle of Operation
The sensor has a magnet and an electromagnet fixed on the vibration plate. When current is applied to the electromagnet, repulsive force of the magnet causes the plate to vibrate.
When the material covers the plate, vibration decreases, causing lower voltages to be induced in the electromagnet. The sensor detects the voltage change to determine material presence.
When the detector is not covered by the material
he electromagnet vibrates at its operating frequency when 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.
