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The KFS spring loaded measuring device operates largely independent of viscosity and is suitable for indicating the flow rate of water, acids, alkaline solutions and gases. Every device is calibrated to customer requirement and fitted with a product-specific scale. The 50 mm thick ring features a half-round plate that is fastened to a rotating spring-loaded spindle. The angle between flap and ring changes according to the rate of flow, and a breakaway-proof magnetic coupling transfers the movement to an external pointer. download pdf datasheet