The robust SBY332 mechatronic flow sensor from ifm electronic operates on the principle of spring supported piston. The piston, located in the valve seat in the housing, is lifted against the spring resistance by the flowing medium.
With volumetric flow quantities ranging from 15 l/min, 25 l/min, 50 l/min, 100 l/min to 200 l/min, the sensor has a fast response time of 10 ms. The switch points can be preset continuously for easy handling. The sensor is available with a variable R or G process connection and is suitable for pressure ranges up to 25 bar in medium temperatures up to 180°C.
For binary signal output the piston position is detected by an inductive sensor. Analogue sensors however detect the position by means of a magnetic-field sensor. The spring resistance forces the piston to return to its original position with decreasing flow. This ensures position-independent installation of the flow sensor preventing backflow.
The switch points can be easily set and fixed via a setting screw. The units are maintenance-free and the robust mechanical design ensures use in harsh environments.
Case History 198: Cascade control overcomes valve problems.
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