Mass flowmeter
First Claim
1. A mass flowmeter for measuring a flux of a fluid comprising:
- a sensor tube including a first tube part for receiving the fluid and a second tube part for outputting the fluid;
vibrating means for vibrating the first tube part at a first position and the second tube part at a second position in mutually opposite directions;
displacement detecting means for detecting a displacement of the first tube part on an upstream side and on a downstream side of the first position and a displacement of the second tube part on an upstream side and on a downstream side of the second position; and
measuring means for calculating the flux of the fluid based on a phase difference between a first sum of the displacements detected on the upstream side of the first position and on the upstream side of the second position and a second sum of the displacements detected on the downstream side of the first position and on the downstream side of the second position.
1 Assignment
0 Petitions
Accused Products
Abstract
A mass flowmeter has a U-shaped sensor tube provided on a support base which is supported on a vibration absorbing member, and both ends of the sensor tube are respectively connected to an inlet and an outlet of a manifold. Vibrators are provided at an intermediate part of each straight tube part provided between the inlet and outlet sides of the sensor tube. Pickups are provided on the upstream and downstream sides of each vibrator so as to detect the displacement of the sensor tube. An external vibration is in an opposite direction between the inlet and outlet sides relative to the vibrating direction. Hence, outputs of the pickups located on the upstream sides of the vibrators are added, and outputs of the pickups located on the downstream sides of the vibrators are added. The external vibration is cancelled by obtaining a phase difference of the two added values.
-
Citations
12 Claims
-
1. A mass flowmeter for measuring a flux of a fluid comprising:
-
a sensor tube including a first tube part for receiving the fluid and a second tube part for outputting the fluid; vibrating means for vibrating the first tube part at a first position and the second tube part at a second position in mutually opposite directions; displacement detecting means for detecting a displacement of the first tube part on an upstream side and on a downstream side of the first position and a displacement of the second tube part on an upstream side and on a downstream side of the second position; and measuring means for calculating the flux of the fluid based on a phase difference between a first sum of the displacements detected on the upstream side of the first position and on the upstream side of the second position and a second sum of the displacements detected on the downstream side of the first position and on the downstream side of the second position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
Specification