Abstract: A flowmeter positioned inside a case having compliant membranes for case ends. The membranes have an axial compliance sufficient to allow the flow tube to expand/contract freely in response to thermal changes without a permanent deformation of the flow tube.

Abstract: A flow meter apparatus for measuring the mass flow rates of fluids passed through a cantilever mounted oscillating sensing tube where the capability of the meter to measure low mass flow rates is enhanced by using a sensing tube which has a low torsional spring constant about its longitudinal axis. Mounted parallel to this sensing tube, also in a cantilever fashion, is a second tube which has essentially identical moments of inertia and spring constants. Connecting the two tubes at their free ends is a lightweight rigid structure. The two tubes with the connecting structure can be sinusoidally driven so that when a fluid is passed through the sensing tube generated Coriolis forces torsionally deflect the connecting structure about an axis located midway between the tubes.