A hydrocarbon mass flow meter

(57) Equipment which used the relation between the density of a hydrocarbon mixture, and a dielectric constant in order to make the measurement capability of a certain existing equipment currently used in summary oil industry improve sharply. Continuation automatic calibration amount-of-water 率計 which measures the water content of multilayer hydrocarbon mass flowmeter (120) and 2 liquid crude-oil style used to the multilayer mixture of 1 oil, water, and Gath is contained in application of equipment.