Showing papers on "Thermal mass flow meter published in 1970"
Patent•
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TL;DR: In this article, the authors describe a new type of flow meter, where the flow in these capillaries is laminar, even if the fluid in the passage upstream of the caulas is in turbulent flow.
Abstract: This disclosure describes a new type of flow meter. A housing defines a passage wherein fluid flows through a plurality of capillaries. The flow in these capillaries is laminar even if the fluid in the passage upstream of the capillaries is in turbulent flow. There are pressure taps across the meter wherein the pressure drop thereacross is linear with respect to the flow through the meter.
100 citations
TL;DR: In this paper, a particle velocity meter is described for the measurement of local solids velocities, depending on the impact of the particles, individual particle momentums or local mass flow rates can be measured.
17 citations
Patent•
11 Jun 1970
TL;DR: In this paper, the outputs of the pressure measuring device and quantity meter are correlated to provide a numerical readout at the register proportional to the pressure of the fluid in the fluid line and a quantity of flow whereby demand on the fluid system is reflected in the quantity readout.
Abstract: The meter includes a quantity meter, pressure measuring device and a register. The outputs of the pressure measuring device and quantity meter are correlated to provide a numerical readout at the register proportional to the pressure of the fluid in the fluid line and a quantity of flow whereby demand on the fluid system is reflected in the quantity readout.
14 citations
Patent•
12 Nov 1970
TL;DR: In this article, a system which includes a flow meter producing voltage pulses of a frequency proportional to the flow rate of a flowing mass, and a sensing element responsive to a physical condition of the flowing mass with a circuit which produces a DC voltage signal analogous to that condition is described.
Abstract: A system which includes a flow meter producing voltage pulses of a frequency proportional to the flow rate of a flowing mass, and a sensing element responsive to a physical condition of the flowing mass with a circuit which produces a DC voltage signal analogous to that condition. A generator provides linear sawtooth voltage pulses against which a comparator circuit compares the analog voltage from the sensing element and circuit. The voltage resultant of the comparison switches a portion of the voltage pulses from the flow meter to a divider circuit element and a subtractor circuit element of the system for conversion of relatively low order changes in the physical condition to their full range equivalents, and for correction of the flow rate or volume as a function of such changes. The flow rate or volume as thus corrected is registered on a suitable flow rate indicator or volume counter.
14 citations
Patent•
23 Mar 1970
TL;DR: In this article, a meter and a method of measuring the velocity of gas in a duct are described, and gas density and mass flow may also be measured, where the meter has an ion source and two ion collectors, so that gas in the duct is first ionized and then passes the collectors.
Abstract: A meter and a method of measuring the velocity of gas in a duct are described, and gas density and mass flow may also be measured. In one form the meter has an ion source and two ion collectors, so that gas in the duct is first ionized and then passes the collectors. The source and the collectors are devised to present little or no impedance to gas flow. A voltage pulse is applied to the first collector and the interval between this pulse and the resulting effect in the number of ions collected at the second collector is measured to give gas velocity. Density measurement is by determining the number of ions collected between pulses at the second collector, and mass flow is obtained by forming the product of velocity and density.
13 citations
Patent•
11 Aug 1970
TL;DR: In this paper, a mass air flow sensitive fuel control for controlling fuel to a multiple-cylinder internal combustion engine was proposed, where the fuel control apparatus includes a high gain venturi disposed in the air induction passage for measuring the air flow to a single engine cylinder and a fuel control valve actuated as a function of the venturi air pressure output.
Abstract: A mass air flow sensitive fuel control for controlling fuel to a multiple cylinder internal combustion engine wherein the fuel control apparatus includes mass air flow sensing means such as a high gain venturi disposed in the air induction passage for measuring the mass air flow to a single engine cylinder and a fuel control valve actuated as a function of the venturi air pressure output for controlling fuel flow to all of the engine cylinders as a function of the mass air flow to the one engine cylinder.
10 citations
Patent•
13 Apr 1970
TL;DR: A TURBINE FLOW METER system is described in this article, which is designed to detect the direction of slow in the FLOW this article to indicate the divergence of the flow rate from an outage.
Abstract: A TURBINE FLOW METER SYSTEM IS DISCLOSED WHICH RESPONDS A RESPIRATORY FLOW RATE OF A PATIENT. THE FLOW METER SYSTEM INCLUDES APPARATUS FOR INDICATING THE DIRECTION OF SLOW IN THE FLOW METER TO DISTINGUISH INSPIRATION FROM EXPIRATION. AN ELECTRONIC CORRELATION SCHEME PERFORMS ON LINE ELECTRONIC CORRECTION OF DYNAMIC ERRORS CREATED IN THE TURBINE ASSOCIATED FLOW METER SYSTEM. THE CORRECTION SCHEME MAKES ADJUSTMENT TO THE OUTPUT OF THE FLOW METER SYSTEM SO THAT ACCURATE SIMULATION OF THE DYNAMIC CHARACTERSTIC CORRECTS THE OUTPUT THEREFROM.
10 citations
Patent•
25 Nov 1970
TL;DR: A control system for the power supply in a mass flow meter, the flow meter having an ionizing electrode and an ion collecting electrode producing first and second currents, to maintain a constant ratio between the electrical potential across and the current flow between the ionizing source and the ion collector is presented in this article.
Abstract: A control system for the power supply in a mass flow meter, the flow meter having an ionizing electrode and an ion collecting electrode producing first and second currents, to maintain a constant ratio between the electrical potential across and the current flow between the ionizing source and the ion collector, so that the differential of the first and second collector currents is directly indicative of mass flow in the flow meter.
9 citations
Patent•
09 Feb 1970TL;DR: In this article, the ratio of vapor to liquid volumes produced by a volatile liquid like gasoline, is determined at selectable temperatures by moving a stream of the liquid at a precisely maintained rate and measuring flow rate evolved vapor.
Abstract: The ratio of vapor to liquid volumes produced by a volatile liquid like gasoline, is determined at selectable temperatures by moving a stream of the liquid at a precisely maintained rate and measuring flow rate evolved vapor. Such vapor flow rate gives desired ratio directly, and is preferably measured by laminar flow meter or mass flow meter or the like, to produce an output proportional to the volume rate of flow and readable as electrical signals. A series of protective safeguard devices guard against hazards and against being misled by a signal obtained while operating conditions are not proper.
6 citations
Patent•
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09 Nov 1970
TL;DR: A liquid flow meter for measuring extremely low flow rates is described in this paper, in which the rate of flow of a liquid is measured by having the flow occur in discrete droplets from a droplet-forming tube into a column of mercury.
Abstract: A liquid flow meter for measuring extremely low flow rates, in which the rate of flow of a liquid is measured by having the flow occur in discrete droplets from a droplet-forming tube into a column of mercury, the formation of a droplet causing the column of mercury to rise and interrupt a beam of light to a photocell for actuating a counter to totalize the number of droplets.
3 citations
TL;DR: In this article, a drag-sphere water current meter with a 0 to 6 ft/sec range has been developed for velocity measurements of relatively steady flows, where a two-component strain-gage type force transducer is mounted within a 3 7-inch-diameter perforated drag sphere.
TL;DR: In this paper, the authors present a flow meter for measuring the flow of liquids under transient conditions and show that the essentially non-linear equations of motion may be linearized to produce easily manageable linear equations.
Abstract: An account of the design and development of a prototype flow meter for measuring the flow of liquids under transient conditions was presented by the author at the Symposium on the Measurement of Pulsating Flow at the University of Surrey, April 1970. The flow meter exhibited good transient behaviour in response to rapid flow variations and a favourable correlation existed between theoretically predicted and experimental steady flow results. This paper gives a derivation of the theory underlying the transient behaviour of the instrument and shows how the essentially non-linear equations of motion may be linearised to produce easily manageable linear equations. The good transient response characteristics are accounted for by virtue of the high value of ‘hydraulic stiffness’.