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DW-L offers a cost-effective and yet flexible option to monitor the flow. The basic version of the device is completely made of plastic. Special variants allow combining it with metals for different applications.
The device works according to the paddle principle. The paddle is fixed on a bearing and protrudes into the flow. A magnet is attached to the opposite side. A second, external magnet repels the paddle magnet. This produces a restoring force. This force may be set by changing the distance between the magnets by means of a screw so that the switching point of the device can be adjusted easily and precisely. A reed switch fixed to the outside is actuated contact-free by means of the magnet on the pendulum.