Coriolis mass flowmeter

PCT No. PCT/GB87/00378 Sec. 371 Date Jan. 24, 1989 Sec. 102(e) Date Jan. 24, 1989 PCT Filed Jun. 2, 1987 PCT Pub. No. WO87/07714 PCT Pub. Date Dec. 17, 1987.In a coriolis mass flowmeter a flexible tube structure for carrying the fluid to be measured comprises parallel tubes (1, 2) fixed at (7, 8) and formed with loops (5, 6). Electromagnetic means vibrate the loops in their own planes in directions normal to arms A, B of the tubes setting up torques on the loops sensed by two sensor pair (14, 15). The signals from the two sensors are used to measure the mass flow rate (since the later is proportional to the time phase-shift of these signals). Also the signals are used to drive and control the driving device for the electromagnetic means.