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.

Apparatus for measuring the flow velocity and/or flow throughput of fluids

Abstract: A flow meter, such as a gas meter, for measuring the flow velocity and/or the volumetric through-flow of fluids. The flow meter has a body with connecting flanges for connecting the meter to a pipeline for the fluids. The meter has a tubular center piece that, on its exterior, has at least two receptacles, each of which receives a measuring device. The measuring devices are coupled to a signal processing unit. Electrical cabling between the measuring devices (probes) and the signal processing unit is completely covered against damage from the exterior by partially guiding the cables through bores in walls of the center piece of the flow meter and by covering portions of the cable and protruding sections of the probes with a cap.

Gyroscopic mass flowmeter

Abstract: A mass flowmeter having a first embodiment (1500) that uses gyroscopic forces rather than Coriolis forces to determine material flow information, such as mass flow rates, for a material flow. The interior of the flow tube (400) defines a helix element (300) that imparts a spin to the material flow within the flow tube. The flow tube is vibrated transversely by a driver (D). The transverse vibrations and the spin imparted to the material flow together generate gyroscopic forces within the flow tube. The magnitude of the flow tube deflection that results from the gyroscopic forces is related to the magnitude of the material flow within the flowmeter and is measured to determine material flow information. A second embodiment (1600) of the flowmeter further functions to detect the Coriolis forces on the vibrating flow tube and generates material flow information from the detected Coriolis forces. The Coriolis based material flow information and the gyroscopic based material flow information are both applied to associated meter electronics which uses the two sets of information for comparison and error checking and other purposes such as compensation.

An investigation of the Muller-Franz calorimeter.

Abstract: 2 aspects of the Muller-Franz dry gas meter were investigated; namely, accuracy of metering and mechanical resistance of the apparatus. The first problem was investigated by pumping known volumes of gas through the meter at varying rates of flow; the second by measuring the resistance in the air circuit by means of a water manometer. The Muller-Franz apparatus, based upon the study of 6 instruments, appears to underestimate gas flow. If a correction factor is applied to account for this, the meter is accurate to approximately plus or minus 3 or 4% between rates of flow of approximately 3 to 100 l/min. The resistance of the mechanical operation of the meter amounts to 20–25 mm water at about 50 l/min and to about 40–50 mm water at approximately 100 l/min.

Method of compensating for erroneous reading in a mass flow meter

Abstract: A method of correcting reading of a non-contact solids flow meter measuring solid particulate flow where the solid particulate product enters the flow tube at one end and flows past a sensor and then exits the flow tube. The sensor for the flow meter is very sensitive and not only can sense particulate flow, but can also pick up system machinery motion such as the rotation of a screw conveyor or other moving machinery parts as product flow and provide a system output reading in excess of the actual flow rate. In addition, if the product flow creates dust during the initial calibration process, and the dust is controlled at the actual installation, the system output reading may indicate a flow rate substantially less than the actual flow. The calibration method of this invention uses the original calibration or performance curves to accurately correct the output readings.