DENSITY MEASURING DEVICE AND METHOD FOR FLUID, VISCOSITY MEASURING METHOD FOR FLUID USING MEASURED DENSITY, AND ORIGINAL PLATE MANUFACTURING METHOD OF SHEETING TYPE USING MEASURED DENSITY

摘要

PROBLEM TO BE SOLVED: To dispense with preliminary computation of a correlation between differential pressure and density through sampling or the like, and to compute an accurate fluid density by excluding a fluctuation in pressure loss as an error in a detection value even when the flow rate of a fluid flowing in a circular tube fluctuates.;SOLUTION: A vertical tube 1 and an inclined tube 2 consisting of the circular tube having the same tube diameter as the vertical tube 1 and inclining at a constant angle to the vertical tube 1 are placed in communication. A differential pressure is measured between two points in the vertical tube 1 spaced in a line direction D, and between two points in the inclined tube 2 with the same interval. A fluid density [kg/m3] is computed from an operation expression: =(P1-P2)/{gL(1-sin)}, wherein L is the interval between pressure measuring means 3a (3a') and 3b (3b'); is the inclination of the inclined tube 2; P1 is the differential pressure in the vertical tube 1; P2 is the differential pressure in the inclined tube 2; and g is a gravitational acceleration.;COPYRIGHT: (C)2002,JPO