Salinity independent multiphase measurements

Multiphase measuring device for measuring the component fractions in a water continuous fluid flow, the fluid containing a combination of water and at least one of gas and oil and flowing through a pipe or similar, the device comprising:

• at least two electrodes coupled to a measuring instrument for measuring chosen characteristics of the fluid at least partially between the electrodes, the measuring instrument being adapted to sample a time sequence of the measured characteristics and to detect periods of a certain amount of gas in the flow,
• a gamma density measuring instrument for sampling the density of the flow in at least one period of time at a chosen sampling rate and to sample a time sequence of the detected signals, and
• calculation means for analyzing the gamma measurements sampled between the periods where the gas content was above a predetermined limit, so as to calculate the mean density of the fluid flow between the gas bubbles.