Patent ID: 7481118
Filing Date: 2009-01-27
Classification: G01F

Abstract:
1. Apparatus obtaining information on the content and flow rate in a fluid flow, e.g. a mixture of oil and water flowing in, for example, a pipe, comprising means for conveying a flowing fluid, means for generating a differential pressure in said fluid passing through said means for conveying said fluid flow, the means for generating a differential pressure being position inside said conveying means, said differential pressure generating means is a having a conical surface against the flow direction, means for measuring said differential pressure, means for measuring a capacitance comprising at least one electrode arranged in a section of said pipe adjacent to the thick end of said conical surface, said differential pressure generating means effectively constitutes an earth electrode for said capacitance measuring means, the electrical field between said pressure generating means and said at least one electrode thus having substantially radial field lines in the volume inside the means for conveying the flowing fluid, and means for combining a result from said means for measuring a differential pressure with a result from said means for measuring a capacitance of a volume of said flowing fluid for thereby to obtain information on the content and flow rate in a fluid flow.