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.

Principle

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.