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Level Switch
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VL
Nohken Vibrating Level Sensor VL
Main application
Level measurement of solids, granular materials and sludge blanket
Main feature
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
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 solid presence and gives an output.
When the detector is not covered by the material
The 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.
Notice of Housing painting Change of Separation model Vibrating Level Sensors VLS
NOHKEN Model VLS12、VLS22、VLS32 (c/w silver hammerton painting) will be abolished by October 2022 and the replacing new models corresponding to them will be VLS13、VLS23、VLS33 (c/w blue color acrylic painting).
Remark: The new models overall dimension, functionality and the other specifications than painting material will remain the same as those of VLS12、VLS22、VLS32 for the convenience of the customers and users.
