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How is paddle level sensor working?

How is paddle level sensor working?


Paddle type level switch is used for level detection for powder or bunk material in silo, hoppar, etc.

The rotating paddle is continuously rotates by a motor. When this paddle contacts with the material, the force more than the rotating torque will be applied to the paddle and the rotation will stop.

The level switch detects rotation ⇔ stop and outputs the contact.


The principle is based on the moment of resistance change of a rotating paddle in air or a medium.

The electrically driven, slowly rotating paddle (frequency = 1Hz) is on the level of the selected limit.

The rising product brakes the rotation, the hinge-mounted drive system changes its position and triggers a micro switch.

As the level moves down, the drive returns to its original position by spring force and the micro switch restarts the motor.

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