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WO2000066979A1 - Debitmetre massique a capteur de force - Google Patents

Debitmetre massique a capteur de force Download PDF

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Publication number
WO2000066979A1
WO2000066979A1 PCT/US2000/012089 US0012089W WO0066979A1 WO 2000066979 A1 WO2000066979 A1 WO 2000066979A1 US 0012089 W US0012089 W US 0012089W WO 0066979 A1 WO0066979 A1 WO 0066979A1
Authority
WO
WIPO (PCT)
Prior art keywords
conduit
target
movement
flow meter
axis
Prior art date
Application number
PCT/US2000/012089
Other languages
English (en)
Inventor
Frank F. Larry
Original Assignee
Venture Measurement Company, Llc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Venture Measurement Company, Llc filed Critical Venture Measurement Company, Llc
Priority to AU49834/00A priority Critical patent/AU4983400A/en
Publication of WO2000066979A1 publication Critical patent/WO2000066979A1/fr

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
    • G01F1/20—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by detection of dynamic effects of the flow
    • G01F1/32—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by detection of dynamic effects of the flow using swirl flowmeters
    • G01F1/3209—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by detection of dynamic effects of the flow using swirl flowmeters using Karman vortices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
    • G01F1/20—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by detection of dynamic effects of the flow
    • G01F1/28—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by detection of dynamic effects of the flow by drag-force, e.g. vane type or impact flowmeter
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
    • G01F1/20—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by detection of dynamic effects of the flow
    • G01F1/32—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by detection of dynamic effects of the flow using swirl flowmeters
    • G01F1/325—Means for detecting quantities used as proxy variables for swirl
    • G01F1/3259—Means for detecting quantities used as proxy variables for swirl for detecting fluid pressure oscillations
    • G01F1/3266—Means for detecting quantities used as proxy variables for swirl for detecting fluid pressure oscillations by sensing mechanical vibrations

Definitions

  • the present invention relates to flow meters, and, more specifically, to a flow meter that determines mass flow rate based on a determination of fluid velocity and fluid density.
  • volumetric flow meters that measure the volumetric rate of a fluid flowing through a conduit.
  • mass flow rate rather than volumetric flow rate (which may vary depending on fluid conditions such as temperature and pressure).
  • measurement of mass flow rate is essential.
  • mass flow meters Some different types of mass flow meters are currently used in industry. However, some such flow meters often involve relatively high energy losses associated with the measurement of the mass flow rate. Some mass flow meters measure the volumetric flow rate of the fluid passing through the flow meter and then multiply that rate by the density of the fluid.
  • the density of the fluid is determined in one of several ways. In one method of determining the density, the fluid is periodically sampled and the density is directly measured. This method has the disadvantage of being time consuming, subject to operator error and inaccurate because the density of the fluid may change between sampling episodes.
  • Another method of determining density includes calculating the density based on measured properties of the fluid and applying these properties to ideal fluid laws (e.g. Boyle-Charles' law, in the case of a gas).
  • This method has the disadvantage of introducing inaccuracies when the fluid is not an ideal fluid (i.e., the fluid is not homogenous, etc.).
  • some flow meters need to add sensors to measure such parameters as temperature to compensate for any disuniformities in the fluid being measured.
  • the disadvantages of the prior art are overcome by the present invention which, in one aspect, is a flow meter for measuring a mass flow rate of a fluid flowing through a conduit.
  • the flow meter includes a target, having an area, capable of being inserted into the conduit, a rod having a first end and an opposite second end, the first end affixed to the target, and a connecting member having a first portion, a spaced-apart second portion, and a flexible portion disposed between the first portion and the second portion.
  • the first portion is capable of being secured to the conduit and the second portion is affixed to the second end of the rod.
  • the flexible portion has a flexibility so that movement of the target results in a translated movement of the second portion via the rod.
  • movement of the second portion is proportional to the movement of the target.
  • a sensor senses displacement of the second portion along a first axis that is substantially parallel to a direction of fluid flow within the conduit and also senses movement of the second portion along a second axis that is transverse to the first axis.
  • a device responsive to the sensor, determines a flow rate of a fluid flowing through the conduit, based on the displacement sensed by the sensor along the first axis and the movement sensed by the sensor along the second axis.
  • the invention is a flow meter for measuring a flow rate of a fluid flowing through a conduit, that includes a bluff body target, having an area, capable of insertion into the conduit and capable of shedding vortices as the fluid flows around the target.
  • the first end of a rod having a first end and an opposite second end, is affixed to the bluff body target.
  • a connecting member has a first portion, a spaced- apart second portion, and a tube defining a cylindrical passage therethrough that opens to a first end, the first end being affixed to the first portion, and an opposite second end, is affixed to the second portion.
  • the rod passes through the passage and the second portion is affixed to the second end of the rod.
  • the first portion is capable of being secured to the conduit.
  • the tube has a flexibility so that movement of the target results in a translated movement of the second portion via the rod, the movement of the second portion being proportional to the movement of the target.
  • a sensor senses displacement of the second portion along a first axis that is substantially parallel to a direction of fluid flow and movement of the second portion along a second axis that is transverse to the first axis. Movement along the second portion indicates the frequency at which vortices are shed by the bluff body target.
  • a computer that is responsive to the sensor is capable of determining a mass flow rate of a fluid flowing through the conduit, based on displacement sensed by the sensor along the first axis and based on the frequency at which vortices are shed by the bluff body target.
  • the invention is a flow meter for measuring a flow rate of a fluid flowing through a conduit.
  • the flow meter includes a target, a rod and a connecting member with the second portion having a reflective outer surface.
  • An optical sensor directs a beam of radiation toward the reflective outer surface and senses a reflection of the beam of radiation from the outer surface, thereby sensing variations in position of the outer surface.
  • a device that is responsive to the optical sensor, determines a flow rate of a fluid flowing through the conduit, based on movement of the outer surface of the second portion sensed by the optical sensor.
  • FIG. 1 is a cross-sectional view of an embodiment of the invention employing an optical displacement sensor.
  • FIG. 2 is a top plan view of a target in a conduit showing vortices shed in a fluid flowing through the conduit.
  • FIG. 3 is a top perspective view of the embodiment of FIG. 1.
  • FIG. 4 is a top perspective view of an embodiment of the invention employing strain gauges to sense movement.
  • FIG. 5 A is a cross-sectional view of an embodiment of the invention employing a capacitive sensor to sense movement.
  • FIG. 5B is a top plan view of the sensor employed in the embodiment shown in FIG. 5A. DETAILED DESCRIPTION OF THE INVENTION
  • one embodiment of the invention is a flow meter 100 for determining the mass flow rate of a fluid flowing through a passage 114 in a conduit 112 having a cross-sectional area.
  • the flow meter 100 includes a fitting 120, that is secured to an opening 116 in the conduit, a target/rod assembly 130 that transmits movement to a connecting member 160 as a result of a fluid flowing, as in direction A, through the passage 114.
  • a sensor 140 detects movement of the connecting member 160 and generates a signal representative thereof.
  • a processor 170 or other type of computer, that is responsive to the signal from the sensor 140 calculates the flow rate in the passage 114.
  • the processor 170 is programmed to calculate the mass flow rate of a fluid flowing through the conduit 112, wherein the mass flow rate equals the density of the fluid times the cross-sectional area of the conduit 112 times the velocity of the fluid.
  • the target/rod assembly 130 includes a bluff body target 132 that is capable of being inserted into the conduit 112 (i.e., its diameter allows it to pass through the opening 116 in the conduit).
  • the target 130 causes a fluid flowing in direction A to shed vortices 202 in the path of the fluid flow A.
  • the vortices 202 alternate from side to side of the target 130 and the frequency at which vortices 202 are generated is proportional to the velocity of the fluid.
  • the vortices 202 are generated, they impart lateral force on the target in a direction T L and T R that is transverse to the direction of fluid flow A.
  • the fluid flowing against the target 130 imparts a force on the target 130 in direction A.
  • the target/rod assembly 130 transmits movement of the target 132 through a rod 134 having a first end 136 and an opposite second end 138, the first end 136 being affixed to the target 132.
  • the connecting member 160 has a first portion 162, a spaced-apart second portion 164, and a flexible portion 166 disposed between the first portion 162 and the second portion 164.
  • the first portion 162 is secured to the conduit 112 through the fitting 120.
  • the fitting 120 will have an internally threaded section 122 and the first portion 162 will have a complementary externally threaded section 168 (a thread sealer may also be employed to prevent leakage).
  • FIG. 1 shows a threaded fitting 120, it will be understood that the scope of the invention extends to all types of fittings commonly used to secure flow meters to conduits (including, e.g., welded fittings, etc.).
  • the second portion 164 is affixed to the second end 138 of the rod 134.
  • the flexible portion 166 has a flexibility so that movement of the target 132 results in a translated movement of the second portion 164 via the rod 134.
  • movement of the second portion 164 is proportional to the movement of the target 132.
  • displacement of the second portion 164 is also in proportion to the force imparted on the target 132 by the fluid.
  • the flexible portion 166 and the first portion 162 form a tube that defines a passage 152 that opens to the opening 116 in the conduit 112.
  • the rod 134 passes through the passage 152 from the target 132 to the second portion 164 of the connecting member 160.
  • the first portion 162 is made from Va" 316L stainless steel hex stock. One end of the stock extending 1.125" is rounded and a remaining 0.5" is left with a hexagonal cross section. The round end is threaded 122 with 1/8-27 NPTF-I Dryseal pipe threads based on the USA pipe thread standard. By using Dryseal threads, a pressure-tight seal may be accomplished without using sealing compounds.
  • stainless steel was chosen for this illustrative embodiment, it is to be understood that other materials could also be used, e.g., 6061 aluminum.
  • the connecting member 160 is made from stainless steel.
  • the wall of the flexible portion 166 of the connecting member 160 has a thickness which could range from 0.010" (for applications where the normal operating pressure does not exceed 1,000 PSIA) to 0.050" (for applications where the normal operating pressure does not exceed 20,000 PSIA). Generally, a thicker wall requires greater force on the target to achieve a meaningful result.
  • the senor 140 senses displacement of the second portion 164 along a first axis C - C2" that is substantially parallel to a direction A. In such an embodiment, the sensor senses the force imparted on the target 132 by the fluid. This embodiment can be used as a force sensing mass flow meter. The velocity of the fluid can be determined by the processor 170 using the following formula:
  • velocity is the average velocity of the fluid flowing through the conduit 112 in direction A;
  • force is the amount of force imparted on the target 132 by the fluid flowing through the conduit 112;
  • target area is the area of the target 132; and “drag” is a coefficient proportional to an amount of drag imparted on the fluid by the target 132.
  • volumetric flow rate velocity x area
  • the senor 140 also senses movement of the second portion 164 along a second axis that is transverse to the first axis.
  • axis C'-C runs along the flow direction A of the fluid and axis D'- D" is transverse to axis C'-C".
  • Displacement along the first axis C'-C" is proportional an amount of force imparted on the target by a fluid flowing through the conduit.
  • movement along the second axis D'-D" is proportional to a velocity of a fluid flowing through the conduit.
  • the movement along the transverse axis would be manifested as oscillations induced by the shedding of vortices, the frequency of which would be proportional to the velocity of the fluid.
  • v is the average velocity of the fluid flowing through the conduit 112;
  • S t is the Strouhal number of the bluff body target 132;
  • f ' is the frequency of vortex shedding by the bluff body target 132;
  • d is the diameter of the bluff body target 132.
  • force is the amount of force imparted on the target 132 by the fluid flowing through the conduit 112;
  • target area is the area of the target 132.
  • Drag is a coefficient proportional to an amount of drag imparted on the fluid by the target 132.
  • the mass flow rate of the fluid may be determined by the processor 170 according to the following formula:
  • mass flow rate density x velocity x area
  • the sensor 140 of the embodiment shown in FIGS. 1 and 3 is an optical displacement sensor that includes a reflective outer surface 150 disposed on the second portion 164 of the connecting member 160.
  • a source 142 of electromagnetic radiation (such as a laser) directs a beam 146 of radiation toward the reflective outer surface 150 and a detector 144 senses a position of the reflected beam 148.
  • the detector 144 generates a signal having a value based on the position of the reflected beam 148.
  • the source 142 is 5 mW laser produced by LASERLYTE of Cottonwood Arizona (part no. DLLC) set to operate in the 630 nm range and the detector 144 is a quadrant array-type light detector produced by SEMICOA of San Jose, California (part no.
  • the reflective outer surface 150 could be an aluminum mirror such as one available from Edmond Scientific of Barrington, New Jersey (part no. P32942), which may be secured to the second portion 164 using Milbond Adhesive also from Edmond Scientific (part no. P53288). It is understood that the parts disclosed herein are presented for illustrative purposes only and that many other embodiments employing many other types of devices and materials would be within the scope of the invention.
  • the processor 170 is responsive to the signal from the detector 144 and determines the flow rate of the fluid flowing through the conduit 112, based on the displacement sensed by the sensor 140.
  • the processor 170 could be a personal computer or an embedded microprocessor connected to the sensor 144 via an interface.
  • the interface would include an analog-to-digital converter and any other signal conditioning electronics necessary to make the signal from the sensor compatible with that of the analog-to-digital converter.
  • the sensor 144 senses displacement of the reflected beam 148 along the B'-B" axis. This movement is proportional to displacement of the second portion 164 along the C'-C" axis, which is proportional to displacement of the target 132 along direction A.
  • the detector 144 is capable of sensing displacement of the reflective outer surface 150 along an axis C'-C" that is parallel to direction A and is capable of sensing movement of the reflective outer surface 150 along an axis D'-D" that is transverse to direction A.
  • displacement along axis C'-C" is proportional to the force imparted on the target 132 by the fluid flowing through the conduit 112, whereas the frequency of movement back-and-forth along axis D'-D" as a result of the vortices being shed by the target 132 is proportional to the velocity of the fluid flowing through the conduit 112.
  • FIG. 3 also shows a voltage source 343 supplying the light source 142.
  • the voltage source 343 could be a battery or a DC power supply, in accordance with the manufacturer's specifications of the light source 142.
  • a mounting member 320 that could be employed to secure the light source 142 and the detector 144 to the conduit 112.
  • This example of a mounting member 320 includes a plate 322 that is affixed to either the conduit 112 or the connecting member 160, or both. Affixed to the place 322 is a frame 324 to which the light source 142 and the detector 144 are secured.
  • many configurations of the mounting member 320 could be employed without departing from the scope of the invention.
  • another embodiment of the invention employs a plurality of strain gauges 440a-d to sense movement of the tube 460 of the connecting member 160.
  • the tube 460 comprises an outer surface 464 having a first arcuate surface 464a; a parallel and opposite second arcuate surface 464b, a first plane 462a bisecting the first arcuate surface 464a and the second arcuate surface 464b; a third arcuate surface 464c bisected by a second plane 462b that is transverse to the first plane 462a; and a fourth arcuate surface 464d that is bisected by the second plane 462b.
  • a first strain gauge 440a is disposed on the first arcuate surface 464a and is capable of generating a signal proportional to strain on the first arcuate surface 464a.
  • a second strain gauge 440b is disposed on the second arcuate surface 464b and is capable of generating a signal proportional to strain on the second arcuate surface 464b.
  • a third strain gauge 440c is disposed on the third arcuate surface 464c and is capable of generating a signal proportional to strain on the third arcuate surface 464c .
  • a fourth strain gauge 440d is disposed on the fourth arcuate surface 464d and is capable of generating a signal proportional to strain on the fourth arcuate surface 464d.
  • the strain gauges 440a-d are affixed to the connecting member 160 using an adhesive.
  • four strain gauges are show in the embodiment of FIG. 4, an embodiment using only two strain gauges, one disposed along plane 462a, and one disposed along plane 462b could also be employed without departing from the scope of the invention.
  • multiple strain gauges may be used on a single plane. In such a situation, they could be set up in pairs to form a Wheatstone bridge configuration in accordance with the practice known to the flow meter art.
  • FIGS. 5A-5B another embodiment of the invention employs a capacitive sensor 540 to detect movement of the second portion 164 of the connecting member 160.
  • a moveable electrode 544 is affixed to the second portion 164 with an insulating adhesive 546, or other insulating fastener.
  • a first stationary electrode 542a is spaced apart from the moveable electrode 544 across a first air gap 548a-b, thereby forming a first capacitor.
  • a second stationary electrode 542c is spaced apart from the moveable electrode 544 across a second air gap 548c-b, thereby forming a second capacitor.
  • a voltage, or potential, may be applied to the first capacitor with a first voltage source 574a-b and the capacitance C A .
  • B across the first capacitor is sensed with a first capacitance sensor 572a-b.
  • Capacitance C A . B is proportional to the width of the first air gap 548a-b, which varies as the second portion 164 is displaced along direction A.
  • a voltage may be applied to the second capacitor with a second voltage source 574c-b and the capacitance C C .
  • B across the second capacitor is sensed with a second capacitance sensor 572c-b.
  • the processor 570 determines the force on the target 132 according to the formulae disclosed above in proportion to the measured capacitances of the first and second capacitor.
  • the capacitive embodiment may also be employed in a two transverse axis device, of the type discussed above.
  • a plurality of stationary electrodes 542a-d are disposed around the moveable electrode 544.
  • the two axes 562a and 562b are orthogonal to each other.
  • the axes 562a and 562b could have a non-orthogonal configuration.
  • four stationary electrodes are shown, a two transverse axis device could be embodied using only two stationary electrodes, so long as the capacitor formed by each stationary electrode lies along an axis that is transverse to the axis of the other capacitor.
  • the transverse axes are orthogonal to each other, wherein one is parallel to direction A and the other is perpendicular to direction A.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Volume Flow (AREA)

Abstract

L'invention concerne un débitmètre (100) destiné à mesurer le débit massique d'un fluide s'écoulant dans une conduite (112) et comprenant une cible (132), dotée d'une région, pouvant être insérée à l'intérieur de la conduite, une tige (134) pourvue d'une première extrémité (136) et d'une seconde extrémité opposée (138), la première extrémité étant fixée à la cible, ainsi qu'un élément de raccord (160) doté d'une première partie (162), d'une deuxième partie (164) espacée de la première, et d'une partie souple située (166) entre la première et la deuxième partie. La première partie peut être fixée à la conduite, la deuxième partie étant fixée à la seconde extrémité de la tige. Grâce à la partie souple, tout mouvement de la cible donne lieu à un mouvement transmis par la tige à la deuxième partie. Ainsi, les mouvements de cette deuxième partie sont proportionnels à ceux de la cible. Un capteur (140) détecte les déplacements de la deuxième partie le long d'un premier axe (C'-C'') sensiblement parallèle à une direction (A) d'écoulement du fluide au sein de la conduite, ainsi que les mouvements de la deuxième partie le long d'un second axe, transversal au premier. Un dispositif (170) réagissant au capteur détermine le débit d'un fluide s'écoulant dans la conduite, en fonction des déplacements détectés le long du premier axe et des mouvements détectés le long du second axe par le capteur.
PCT/US2000/012089 1999-05-05 2000-05-03 Debitmetre massique a capteur de force WO2000066979A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU49834/00A AU4983400A (en) 1999-05-05 2000-05-03 Force-sensing mass flow meter

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US30589399A 1999-05-05 1999-05-05
US09/305,893 1999-05-05

Publications (1)

Publication Number Publication Date
WO2000066979A1 true WO2000066979A1 (fr) 2000-11-09

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PCT/US2000/012089 WO2000066979A1 (fr) 1999-05-05 2000-05-03 Debitmetre massique a capteur de force

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AU (1) AU4983400A (fr)
WO (1) WO2000066979A1 (fr)

Cited By (10)

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Publication number Priority date Publication date Assignee Title
WO2010023484A1 (fr) * 2008-08-29 2010-03-04 Spirax-Sarco Limited Débitmètre
CN101750116A (zh) * 2010-02-22 2010-06-23 泉州日新流量仪器仪表有限公司 一种流量计用的受力元件
CN103244099A (zh) * 2013-04-19 2013-08-14 中国石油天然气股份有限公司 杠杆式流量计
GB2499995A (en) * 2012-03-05 2013-09-11 Spirax Sarco Ltd Target flow meter
DE102015001102A1 (de) * 2015-01-30 2016-08-04 Illinois Tool Works Inc. Strömungsdetektor und Verfahren zur Überwachung eines Klebstoffflusses
DE102015114197A1 (de) * 2015-08-26 2017-03-02 Bürkert Werke GmbH Strömungsmesser
CN108548573A (zh) * 2018-05-04 2018-09-18 湖南菲尔斯特传感器有限公司 差压式流量计
USD866375S1 (en) 2017-08-02 2019-11-12 Buoy Labs, Inc. Water flow monitoring device
US10704935B2 (en) 2016-12-04 2020-07-07 Buoy Labs, Inc. Fluid flow detector with tethered drag block
US11781895B2 (en) 2018-02-23 2023-10-10 Buoy Labs, Inc. Fluid flow analysis and management

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US4926695A (en) * 1987-09-15 1990-05-22 Rosemount Inc. Rocking beam vortex sensor
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US4604906A (en) * 1984-09-24 1986-08-12 Scarpa Thomas J Flowmeter
US4788869A (en) * 1986-06-27 1988-12-06 Florida State University Apparatus for measuring fluid flow
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US4926695A (en) * 1987-09-15 1990-05-22 Rosemount Inc. Rocking beam vortex sensor
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Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8918293B2 (en) 2008-08-29 2014-12-23 Spirax-Sarco Limited Flow meter
WO2010023484A1 (fr) * 2008-08-29 2010-03-04 Spirax-Sarco Limited Débitmètre
CN101750116A (zh) * 2010-02-22 2010-06-23 泉州日新流量仪器仪表有限公司 一种流量计用的受力元件
GB2499995A (en) * 2012-03-05 2013-09-11 Spirax Sarco Ltd Target flow meter
US8966995B2 (en) 2012-03-05 2015-03-03 Spirax-Sarco Limited Flow meter
US9285255B2 (en) 2012-03-05 2016-03-15 Spirax-Sarco Limited Flow meter
JP2017122736A (ja) * 2012-03-05 2017-07-13 スピラックス‐サルコ リミテッド 流量計
GB2499995B (en) * 2012-03-05 2018-01-31 Spirax-Sarco Ltd Flow meter
CN103244099A (zh) * 2013-04-19 2013-08-14 中国石油天然气股份有限公司 杠杆式流量计
US10627270B2 (en) 2015-01-30 2020-04-21 Illinois Tool Works Inc. Flow detector and method for monitoring an adhesive flow
DE102015001102A1 (de) * 2015-01-30 2016-08-04 Illinois Tool Works Inc. Strömungsdetektor und Verfahren zur Überwachung eines Klebstoffflusses
DE102015001102B4 (de) 2015-01-30 2022-01-20 Illinois Tool Works Inc. Strömungsdetektor und Verfahren zur Überwachung eines Klebstoffflusses
DE102015114197A1 (de) * 2015-08-26 2017-03-02 Bürkert Werke GmbH Strömungsmesser
US10704935B2 (en) 2016-12-04 2020-07-07 Buoy Labs, Inc. Fluid flow detector with tethered drag block
USD866375S1 (en) 2017-08-02 2019-11-12 Buoy Labs, Inc. Water flow monitoring device
US11781895B2 (en) 2018-02-23 2023-10-10 Buoy Labs, Inc. Fluid flow analysis and management
CN108548573A (zh) * 2018-05-04 2018-09-18 湖南菲尔斯特传感器有限公司 差压式流量计
CN108548573B (zh) * 2018-05-04 2024-03-08 湖南菲尔斯特传感器有限公司 差压式流量计

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