Profile: FineTek Co., Ltd provide complete instrumentation solutions. Our SE series rotary paddle level switch operating principle is simple. A unit is usually located through a bin wall at the top, middle or low level of a bin. During normal operation (no material present) a synchronous motor rotates the paddle at 1 RPM. When this paddle rotation is impeded by material, surrounding the paddle, motor will stall and cause the Micro-switch to change state. The performance of torsion is stable and reliable. The torque force is adjustable. If the rotary paddle bears an extra overload, the motor will be appeared slide to prevent the inside mechanism damaged. This switch is suitable for small tank and material of low density.