The proven flowmeters and switches model DSV are based on the principle of the well-known float-type flowmeters except for the conventional tapering measuring tube.
The monitored air stream acts on the paddle and over a mechanism actuates the dust-proof microswitch that signals whether the set min. or max. volume of air flows.
The KOBOLD flow monitor FPS operates according to the proven paddle bellows principle. The flowing medium acts on the paddle thus actuating a microswitch.