Electromagnetic pulse pick-up arrangement in a flow meter
AssigneeBopp & Reuther GmbH
InventorsJurgen Bohm, Walter Jerger
Life of this patent
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Abstract
An electromagnetic pulse pick-up unit, particularly for use in flow meters having small nominal width, comprises a pair of magnets arranged at opposite locations and with opposite polarity in a measuring gear of the flow meter. Concentrically arranged with the axis of rotation of the gear, there is provided a sensing unit assembled of a central pick-up cylinder, a sensing coil arranged around the portion of the cylinder facing the magnet, and a plurality of Wiegand wires distributed side by side in axial direction on the cylindrical outer surface of the pick-up cylinder in close proximity to the sensing coil. A pole ring of magnetically conductive material short circuits the ends of the Wiegand wires remote from the magnets.
Claims9
An electromagnetic pulse pick-up arrangement in a flow meter including a measuring chamber defining an inlet and outlet and a front wall of a magnetically non-conductive material, a measuring gear supported in the measuring chamber for rotation about an axis, the pick-up arrangement comprising a pair of oppositely polarized magnets secured to the measuring gear at opposite locations relative to said axis, a cylindrical well formed in the front wall opposite the measuring gear, a stationary Wiegand sensor including a central pick-up cylinder arranged in the well in an axially spaced relationship with the measuring gear, one end of said pick-up cylinder facing said two magnets, a sensing coil surrounding a portion of the jacket of the pick-up cylinder close to said one end, a plurality of Wiegand wires arranged substantially parallel to each other and extending in axial direction on the jacket of the pick-up cylinder, a portion of each of said Wiegand wires overlapping said sensing coil, and a pole ring of a magnetically conductive material inserted on another portion of the jacket of the pick-up cylinder remote from said one end, and a pole ring engaging another portion of each of said Wiegand wires.
Dependencies are inferred from the claim text.