A multiphase densitometer 10 measures the density and phase fraction of a multiphase fluid composed of separate phases in a mixture. The densitometer 10 comprises a vertical chamber connected to a flow line by inlet 21 and outlet 22 proximate lower and upper ends of the chamber respectively, via isolation valves 31, 32. A fluid sample is captured by opening and closing the valves. A differential pressure transducer 70 measures at frequent intervals or continuously a differential pressure dp between upper and lower pressure taps 41, 42, separated by a gauge height HT, to obtain minimum and stabilised differential pressures in the chamber. An ultrasound Doppler level transmitter 80 measures a stabilised liquid level HL in the chamber. A computer coupled with the differential pressure transducer and ultrasound Doppler transmitter computes one or more phase properties.
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