Thermal mass flow meter

About: Thermal mass flow meter is a research topic. Over the lifetime, 1759 publications have been published within this topic receiving 21878 citations.

Fluid flow meter

Abstract: 994,100. Measuring fluid flow. BODENSEEWERK PERKIN-ELMER & CO. G.m.b.H. July 24, 1963 [July 24, 1962], No. 29357/63. Heading G1R. An apparatus for measuring the velocity of flow of a gas the level 7 of a liquid in a container 1 is raised above an opening 3 of a gas supply line 4 by energizing a coil 11 to attract a spring loaded ferromagnetic member 6 downwardly into the liquid. The gas flowing from the line 4 carries a liquid film 20 upwardly along a pipe 2 which film 20 bridges the ends of two bar electrodes 14 to start a time measuring apparatus. After a predetermined distance along the electrodes 14 the film 20 is destroyed by an electrical filament 17 to open circuit the electrodes 14 and stop the time measuring apparatus.

Testing and inspecting device of flow meter

Abstract: PURPOSE: To accomplish the test and calibration in a simple but highly accurate manner by arranging a normal flow meter and a sonic nozzle upstream and downstream of a passage, respectively, thereby to eliminate the deteriorating influence upon the flow rate measurements. CONSTITUTION: Atomospheric air or other gases are compressed by a compressor 5, and a storage tank 6, which can be held at a necessary pressure, is charged with the compressed air or other gases through a suitable filter 4 for filtering dusts, mists and the like. The resultant fluid is discharged under a sonic condition into the atmosphere from a downstream standard sonic nozzle or a sonic nozzle 3 to be tested through a flow meter to be tested or a standard flow meter 2, which is arranged at a downstream position. Incidentally, the sample may be either the flow meter 2 or the sonic nozzle 3, and the standard element in that case is calibrated in advance by another method. As a result, the disturbing phenomena or other deteriorating influences due to the provision of the sonic nozzle upstream of the flow meter are eliminated so that the testing and calibrating operations can be accomplished in an easy but highly accurate manner. COPYRIGHT: (C)1980,JPO&Japio

Flow rate meter

Abstract: THE INVENTION RELATES TO A FLOW RATE METER WHICH GIVES AN INDICATION OF THE FLOWRATE DEPENDENT UPON THE DIFFERENTIAL PRESSURE ACROSS, OR THE UPSTREAM PRESSURE OF A MEASURING ORIFICE. THE SIZE OF THE ORIFICE IS VARIED BY A CONTROL MEMBER, THE POSITION OF WHICH RELATIVE TO THE ORIFICE IS USED TO PROVIDE THE INDICATION OF THE FLOWRATE. THE METER IS NEITHER OF THE CONSTANT-PRESSURE-DROP TYPE, NOR OF THE CONSTANT-AREA TYPE AS THE AREA OF THE ORIFICE DEPENDS UPON THE POSITION OF THE CONTROL MEMBER.

Measurement of mass flow rate using a vortex flowmeter

Abstract: Conventional mass flow rate is derived from volumetric flow rate multiplied by fluid density. However the measurement accuracy is not satisfying because of density variation. Mass flowmeters that can directly measure mass flow rate have been studied and developed recently. But these flowmeters still have limits in practical application. Mass flow rate directly measured by a vortex flowmeter has been proposed to overcome these disadvantages. But the piezoelectric sensor widely used in vortex flowmeter is subjected to noise disturbances caused by pipe vibrations and fluid turbulence. Many efforts on the sensor structure and signal processing have been made to improve the anti-noise ability. However the results are not so satisfactory. A new method using differential pressure between upstream and downstream sides of the vortex shedder to detect the vortex shedding is presented, from which vortex frequency and pressure drop are measured simultaneously. With this method mass flow rate is obtained directly and noise disturbance is reduced.