New principle of operation and probe construction (Patent)
Withstand up to 150 ℃ (180 ℃ as option.)
Fail safe switch is provided
Less subject to build up and dead stock
** If purchasing replacement part, just give us the serial number and we will supply the correct part.**
General Description
Model VL is designed to detect powders, solids, granular material including such very light powders as instant coffee, powdered milk, iron oxide, and toner for use in
medium and/or large sized hopper. There are several versions available to meet a variety of hopper/silo operations. Model VL 12, standard type, is used for high and low level detection. For low level detection in large silos, model VL 12-G is available with a protected shield to protect from the lateral load on the probe. Model VL22, pipe extension type, is suitable for high or low alarm in large silos with top mounting. Pipe extension up to 2500mm for Plug mounting and 4000mm for Flange mounting are available. Model VL32, cable extension type, is also suitable for high or low alarm with a flexible PVC coated cable available in length up to 6000mm.
Operational Description
The vibration rod of new VL series is constructed by using the electro magnet and the permanent magnet. When the electro magnet is energized, the electro magnet and permanent magnet are attracted and repulsed. This movement makes vibration.
The construction of vibration probe is similar to the motor. When the motor is energized by the battery, the back electromotive current is generated by the influence of permanent magnet and coil. When the vibration rod is covered with solids or powdered material, the current flowing to the lead wire is increased by damping of the back electromotive current. The amplifier detects the shifting of current level, and converts to output signal.
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