The PSR from KOBOLD is a high-quality paddle flow monitor that is used for liquids. This device is designed for easy, cost-effective and accurate monitors of fluid motions. Depending on the flow velocity/flow output, the baffle plate is deflected and it moves over the balance arm. The constant magnet into the operating range of the reed contact is mounted outside the process fluid. The leaf spring, which also provides as a support for the balance arm.