1. Working Principle
Making use of the electrical machinery to bring blade revolving, when the medium rises to the blade position, the blade stops rotation because of the impediment of the medium, thus through the related control organization outputs open(pass) or close(break) the electronic contact signal; When the medium stops and leaves the blade, under the function of spring, the blade restores the beginning position to continue to rotate and survey the variation position of the medium.

2. Features
A. Detection of the loose solid materials using the technology of the rotating blade
B. The highly integrated mechnical seal to prevent infiltration of dust along the axis
C. The unique elastical clutch structure, when the blade being overloaded, the automatic protection of electrical machinery could be realized
D. Completely mechnical and electrical separation structure, need not to demolish wholely, easy to maintain
E. Special blades can be used for low-density mediums
F. Use of the process connecting pieces, easy to install.

3. Applications
Applicable to the manufacturing and processing equipment in the industry of food, feed, cement, plastics processing, basic engineering, chemical and chemical fiber, etc.