Patent ID: 7694585

Claim:
A straight tube type Coriolis flowmeter for tertiary mode vibration with an elastic connection member and a pedestal, comprising: a straight-tube-type flow tube through which a fluid to be measured flows; a drive device for driving the flow tube by a tertiary mode vibration; a pair of detection means for detecting a phase difference proportional to a Coriolis force acting on the flow tube; a rigid pedestal situated on the outer side of the flow tube while keeping coils of the drive device and of the pair of detection means fixed in position; and a pair of elastic connection members connecting the pedestal to the flow tube at two predetermined positions of the flow tube, wherein, assuming that an axial direction of the flow tube is a Z-axis, a driving direction of the drive device orthogonal to the Z-axis is an X-axis, and a direction orthogonal to the Z-axis and the X-axis is a Y-axis, the elastic connection members are of a structure exhibiting lower rigidity in the Z-axis direction than in the X-axis direction and the Y-axis direction, and lower rigidity in a direction of rotation around the Y-axis than in a direction of rotation around the Z-axis and a direction of rotation around the X-axis.