Fuji Electric Co., Ltd.

Iwao Matsumoto

Hironobu Yao

Masami Kishiro

Masato Takahashi

Michihiko Tsuruoka

Hiroyuki Yoshimura

Masakazu Kawakami

Keita Ohkawa

Keita Okawa

A mass flow meter provides improved accuracy in measuring the mass flow rate of a fluid flowing through a straight measuring tube. The as measured mass flow rate value is changed by parameters such as the Young's modules, second moment of area, length, axial force, etc. of the measuring tube. The parameters change with the strain caused in the axial direction of the measuring tube. A strain sensor is installed on a measuring tube, and the as measured mass flow rate is corrected based on the output of the strain sensor. Since the strain affects in a different way the substantial mass flow rate and the zero point offset, the correction is conducted separately on the substantial mass flow rate and on the zero point offset so that the accuracy of measurement may be improved. Since the parameters change also with the temperature of the measuring tube, a temperature sensor is also installed on the measuring tube so that the accuracy of measurement may be further improved.

Mass flow meter

The precision of phase difference obtained by a phase difference calculating unit is improved by correction through outputs of a frequency ratio calculating unit and a temperature calculating unit considering that the phase or time difference of each output signal of a vibration sensor indicating the mass flow or density of a fluid is a function of the temperature and axial force on a measurement pipe, or that the axial force is a function of the ratio between two resonant frequencies.

Vibration measuring instrument

A Coriolis mass flowmeter which measures mass flow rate of a fluid flowing in a measuring pipe fixed to a housing, utilizing Coriolis'force generated in proportion to mass flow rate of the fluid, wherein the measuring pipe includes: a fixation portion to be fixed to the housing; a portion near the fixation portion; and a vibration canceling element attached to the housing and associated with the fixation portion, and for dynamically canceling vibration of the fixation portion of the measuring pipe, or the portion near the fixation portion of the measuring pipe. The measuring pipe may be straight, and a reinforcing member may be provided to cancel vibration of the fixation portion of the measuring pipe.

Coriolis mass flowmeter

Growing community of inventors

Kawasaki, Japan

Iwao Matsumoto