To detect the flow rate of powder and bulk solids in pneumatic-conveying line, installing a solids flow meter at the inlet or outlet of the line is usual. If youput a gas-solids-2-phase flow meter instead, this can save installing space and cost, and make a completely enclosed system. As a matter of fact, usage of pneumaticflow meter which we developed, brought us such advantages. For yours reference, I would like to introduce you the flow meter, although its applications are not somany and its performance is not so perfect.