System for determining the ratio of oil to water in a metered fluid stream

A system for metering a fluid stream constituted by a mixture of oil and water to determine the volumetric ratio of oil to water in said mixture, said system comprising:

• A. a vortex meter having a flow tube through which the stream is conducted to produce a meter signal whose frequency depends on the volumetric flow and whose amplitude depends on the mass flow of the stream;
• B. means solely responsive to the frequency of the meter signal to produce a volumetric flow signal;
• C. means solely responsive to the amplitude of the meter signal to produce a mass flow signal;
• D. means to divide the volumetric flow signal by the mass flow signal to produce a density signal;
• E. means to sense the temperature of the stream passing through said tube to produce a temperature signal;
• and
• F. an electronic computer whose memory has stored therein the relationship between water density and temperature and the relationship between oil density and temperature, said computer having fed thereto said volumetric, density and temperature signals and determining the respective volumes of oil and water in said mixture.