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Grundfos flow sensors. The VFI is the industrial version of the Grundfos vortex flowmeter range. The VFI is based on the principle of vortex shedding behind a bluff body. The VFI has no moving parts and is built into a stainless steel pipe. The rugged design allows the VFI to be used in a wide range of applications as a cost-effective and accurate flow sensor. The flow sensors are supplied with flanges or with threaded ends for use with union nuts.