NOHKEN INC.
NOHKEN INC VF Vibrating Level Sensor
Manufacturer: NOHKEN INC
Model: 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)
Example
Principle of Operation
The sensor has a magnet and an electromagnet fixed on the vibration plateThe applied current energizes the electromagnet, and the magnet’s repulsive force makes the plate vibrate. When the material covers the plate, it reduces the vibration, which in turn induces lower voltages in the electromagnet. The sensor detects the voltage change to determine material presence.
When the detector is not covered by the material
Alternating current makes the electromagnet vibrate at its operating frequency.
Back electromotive force on the electromagnet becomes the largest due to change in magnetic field from the magnet
The sensor detects the uncovered detector.
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 detects the covered detector.
Inside the housing
Compact version
