DK154246B - MEASURING DIMENSIONS FOR DETERMINING THE FLOW AMOUNT OF A FLOWING FLUID - Google Patents

MEASURING DIMENSIONS FOR DETERMINING THE FLOW AMOUNT OF A FLOWING FLUID Download PDF

Info

Publication number
DK154246B
DK154246B DK422981A DK422981A DK154246B DK 154246 B DK154246 B DK 154246B DK 422981 A DK422981 A DK 422981A DK 422981 A DK422981 A DK 422981A DK 154246 B DK154246 B DK 154246B
Authority
DK
Denmark
Prior art keywords
measuring
transducers
measuring tube
sensor according
signals
Prior art date
Application number
DK422981A
Other languages
Danish (da)
Other versions
DK154246C (en
DK422981A (en
Inventor
Claudio Meisser
Hubert Lechner
Original Assignee
Landis & Gyr Ag
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 Landis & Gyr Ag filed Critical Landis & Gyr Ag
Publication of DK422981A publication Critical patent/DK422981A/en
Publication of DK154246B publication Critical patent/DK154246B/en
Application granted granted Critical
Publication of DK154246C publication Critical patent/DK154246C/en

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
    • G01F1/66—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 measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
    • G01F1/662—Constructional details

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Volume Flow (AREA)
  • Measuring Arrangements Characterized By The Use Of Fluids (AREA)
  • Ultra Sonic Daignosis Equipment (AREA)
  • Pressure-Spray And Ultrasonic-Wave- Spray Burners (AREA)

Abstract

1. A measured value generator for determining the quantitative flow rate of a fluid flowing through a pipe system by measuring the transit times of ultrasound within the fluid along a measuring section through which the fluid flows, provided with connecting heads (1, 2) for the feed and discharge of the fluid, which are in the form of large-volume distributor chambers (3, 4) and which are provided with a measuring pipe (7), and further comprising measuring transducers (16, 17) which are disposed in opposite relationship to the two ends (8, 9) of the measuring pipe in the connecting heads and which are in direct contact with the fluid, wherein the axis of the measuring pipe is normal to centres of their active transmission surfaces (14, 15), characterised in that there is provided a means (18) for suppressing ultrasonic signals, which so suppresses the ultrasonic signals which are emitted by the active transmission surfaces (14, 15) of the measuring transducers (16 and 17 respectively) outside of the measuring pipe (7), that no interference echo signals are received by the measuring transducers (16 or 17) in the receiving phase.

Description

DK 154246 BDK 154246 B

Den foreliggende opfindelse angår en måleværdigivér til bestemmelse af gennemstrømningsmængden af en gennem et rørsystem strømmende væske ved måling af løbetiderne af ultralyd i væsken langs en af væsken gennemstrømmet målestræk-5 ning, ifølge krav 1's indledning.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a measuring value sensor for determining the flow rate of a fluid flowing through a pipe system by measuring the running times of ultrasonic fluid in a liquid along a measurement line flowed by the liquid, according to the preamble of claim 1.

Til bestemmelse af gennemstrømningsmængden af en væske gennem et rørsystem er det kendt (tysk fremlæggelsesskrift 29 24 561) at sende ultralydimpulser gennem en strømmende væske for ud fra impulsernes løbetid at kunne slutte 10 sig til middelstrømningshastigheden af væsken. En måling af impulsernes løbetider langs et af væsken gennemstrømmet rørstykke har her vist sig mest hensigtsmæssigt. Ved denne kendte anordning vender de ind i målerørets ydre rum udstrålede ultralydimpulser tilbage som ekkosignaler. Derved bliver 15 nyttesignalerne forstyrret, hvilket medfører en fejlbehæftet måling af gennemstrømningsmængden. Ved hvilende strømningsmiddel bliver en gennemstrømning da foregøglet, når ekkosig-nalerne og nyttesignalerne ikke indbyrdes ophæver hinanden.To determine the flow rate of a liquid through a piping system, it is known (German Patent Specification 29 24 561) to transmit ultrasonic pulses through a flowing fluid in order to join the mean flow rate of the fluid based on the duration of the pulses. A measurement of the impulse durations along a pipe flowing through the liquid has proved most convenient here. With this known device, the ultrasonic pulses emitted into the outer space of the measuring tube return as echo signals. As a result, the 15 utility signals are disturbed, resulting in a faulty measurement of the flow rate. In the case of dormant flow means, a flow is then pre-merged when the echo signals and the utility signals do not cancel each other out.

Derudover er det kendt (tysk fremlæggelsesskrift 20 27 30 770) at anbringe et akustisk filter i udsugningskana len i en forbrændingsmotor foran en ultralydmåleanordning, som tjener til måling af indsugningsluftens strømningshastighed. Dette akustiske filter undertrykker i så vid udstrækning som muligt ultralydkomponenter frembragt udenfor anord-25 ningen. Det er desuden også kendt at anbringe et yderligere akustisk filter til absorption af sådanne forstyrrende ultralydkomponenter, som frembringes inden i forbrændingsmaskinen. Begge akustiske filtre tjener derfor til "afskærmning” af måletransducerne overfor udefra på disse indfaldende støj-30 komponenter. Endelig er det ved ultralydluftgennemstrøm- ningsmålere i indsugningsledningen til forbrændingsmotorer også kendt at forsyne de elementer, som luften stryger forbi, henholdsvis som den rammer, med de mindst mulige bestrygningsflader og eksempelvis at afskrå dem, hvorved hvirvel-35 dannelsen af gasstrømningen formindskes. Disse anordninger har imidlertid intet at gøre med undgåelsen af ekkosignaler, som er initieret af selve måletransducerne.In addition, it is known (German presentation specification 20 27 30 770) to place an acoustic filter in the exhaust duct in an internal combustion engine in front of an ultrasonic measuring device which serves to measure the flow rate of the suction air. This acoustic filter suppresses as far as possible ultrasonic components generated outside the device. In addition, it is also known to apply an additional acoustic filter to absorb such disturbing ultrasonic components produced within the combustion engine. Therefore, both acoustic filters serve to "shield" the target transducers from the outside on these incident noise components. Finally, ultrasonic air flow meters in the internal combustion engine suction line are also known to supply the elements with which the air flies, respectively, as it strikes. the least possible coating surfaces and, for example, to cut them off, thereby reducing the vortex generation of the gas flow, but these devices have nothing to do with the avoidance of echo signals initiated by the target transducers themselves.

Formålet med den foreliggende opfindelse er at for- 2The object of the present invention is to provide 2

DK 154246 BDK 154246 B

bedre en måleværdigiver af den angivne art i den henseende, at forstyrrende ekkosignaler bliver således undertrykt, at der ikke opstår nogen målefejl.better a measuring value transmitter of the kind specified in the sense that interfering echo signals are suppressed so that no measurement error occurs.

Ifølge opfindelsen opnås dette ved at udforme måle-5 værdigiveren som angivet i krav 1's kendetegnende del.According to the invention, this is achieved by designing the measuring value sensor as set forth in the characterizing part of claim 1.

Den simple til undertrykkelse af ekkosignalerne tjenende anordning absorberer, spreder og/eller reflekterer de ind i det ydre rum af målerøret udstrålede ultralydsignaler, så at måletransduceren under modtagefasen ikke optalo ger forstyrrende ekkosignaler.The simple device for suppressing the echo signals absorbs, spreads and / or reflects the ultrasound signals emitted into the outer space of the measuring tube so that the target transducer does not detect interfering echo signals during the receive phase.

Opfindelsen skal herefter forklares nærmere under i henvisning til tegningen, hvor fig. 1 viser en udførelsesform for en måleværdigiver ifølge opfindelsen vist i snit og 15 fig. 2 og 3 yderligere udførelsesformer ifølge op findelsen i delsnit.The invention will now be explained in more detail below with reference to the drawing, in which fig. 1 shows an embodiment of a measuring value sensor according to the invention shown in section and FIG. 2 and 3 further embodiments according to the invention in partial sections.

Målestrækningen i måleværdigiveren består af to tilslutningshoveder 1 og 2 med to storrumsfordelingskamre 3 og 4, der danner blokformige hullegemer, hvilke forde-2o. lingskamre har op til hinanden liggende skillevægge 5 og 6, der forbinder de to fordelingskamre 3 og 4 fast med hinanden. Et målerør 7 strækker sig gennem skillevæggen 5 og 6 og ligger med enderne henholdsvis 8 og 9 så langt inde i det indre af fordelerkamrene 3,4, at disse på alle sider 25 omslutter enderne 8 og 9 af målerøret 7 i det mindste over en længde, som er større end den indvendige diameter af målerøret 7.The measuring distance in the measuring transducer consists of two connection heads 1 and 2 with two large space distribution chambers 3 and 4, which form block-shaped hollow bodies, which spread-2o. interlacing chambers have adjacent dividers 5 and 6 which connect the two distribution chambers 3 and 4 firmly to each other. A measuring tube 7 extends through the partitions 5 and 6 and lies with the ends 8 and 9, respectively, so far within the interior of the distributor chambers 3,4 that on all sides 25 the ends 8 and 9 of the measuring tube 7 are at least over a length. which is larger than the inner diameter of the measuring tube 7.

Det første tilslutningshoved 1 har en tilslutnings-nippel 10 for et med en pil betegnet tilløb 11 af væsken 3o ind i fordelerkammeret 3, og det andet tilslutningshoved 2 har en yderligere tilslutningsnippel 12 for et ligeledes ved hjælp af en pil betegnet afløb 13 for væsken fra fordelerkammeret 4. De anførte tilslutningsnipler 10 og 12 ligger fordelagtigt i en fælles akse med en endefladeafstand 35 A, der svarer til en normalafstand for indbygningen af vandmålere i vandledningen.The first connection head 1 has a connection nipple 10 for an arrow 11 designated the liquid 11 of the liquid 3o into the distributor chamber 3, and the second connection head 2 has a further connection nipple 12 for a drain 13 for the liquid also indicated by an arrow. The distribution chamber 4. The indicated connection nipples 10 and 12 are advantageously located in a common axis with an end surface distance 35 A which corresponds to a normal distance for the incorporation of water meters in the water line.

Væsken, som skal måles, strømmer fra tilløbet 11 gennem det første fordelerkammer 3, trænger ved den ene en- 3The liquid to be measured flows from the inlet 11 through the first distributor chamber 3, penetrating one end 3.

DK 154246 BDK 154246 B

• deflade af enden 8 ind i målerøret 7, forlader dette ved’ dets anden ende 9, strømmer gennem det andet fordelerkammer 4 og kommer til afløbet 13. Aksen i målerøret 7 står vinkelret på centrene af overføringsfladerne 14 og 15 af 5 hver sin måletransducer 16,17. De direkte for den strømmende væske udsatte overføringsflader 14,15 på måletransducerne 16,17 har hver en afstand E fra endefladen af enderne 8,9 på målerøret 7. Afstandene E er valgt således, at der for gennemstrømningen af væsken på den ene side fås lo to gennemstrømningstværsnit, der er så stor som muligt ved endefladerne af målerøret 7, og på den anden side er det for nøjagtigheden af målingen af løbetider ønskeligt at holde afstandene E så små som muligt. Gode resultater foreligger, når afstandene E tilnærmelsesvis udgør halvdelen 15 af den indvendige diameter af målerøret 7.Deflate the end 8 into the measuring tube 7, leaving it at its other end 9, flowing through the second distributor chamber 4 and reaching the drain 13. The axis of the measuring tube 7 is perpendicular to the centers of the transfer surfaces 14 and 15 of 5 each measuring transducer 16 , 17th The transfer surfaces 14,15 directly exposed to the flowing liquid on the measuring transducers 16,17 each have a distance E from the end surface of the ends 8,9 on the measuring tube 7. The distances E are chosen so that the flow of the liquid on one side is obtained two flow cross-sections which are as large as possible at the end faces of the measuring tube 7 and, on the other hand, for the accuracy of the measurement of maturities, it is desirable to keep the distances E as small as possible. Good results are obtained when the distances E are approximately half of the inner diameter of the measuring tube 7.

Endefladerne af ender 8 og 9 af målerøret 7 er af-skrået udad eller bearbejdet runde.The end faces of ends 8 and 9 of the measuring tube 7 are beveled out or machined round.

Måleværdigiveren er til undertrykkelse af de forstyrrende ekkosignaler forsynet med en anordning 18, som 2o består af to symmetrisk, i forhold til skillevæggene 5,6 af de to fordelerkamre 3,4 på målerøret 7 anbragte manchetter 19,20, der er fremstillet af ultralydabsorberende materiale. De har vinkelret på væskens gennemstrømnings-retning i målerøret 7 forløbende overflader 21,22. Disse 25 overflader 21,22 kan også udformes ru for de pågældende ultralydsignaler og følgelig bevirke en diffus refleksion.The measuring value sensor is provided for suppressing the interfering echo signals with a device 18 consisting of two symmetrically, relative to the partitions 5,6 of the two distributor chambers 3,4 on the measuring tube 7, cuffs 19,20 made of ultrasonic absorbent material. . They have perpendicular surfaces 21,22 perpendicular to the flow direction of the liquid in the measuring tube 7. These surfaces 21, 22 can also be rough for the ultrasound signals concerned and consequently cause a diffuse reflection.

Manchetterne 19,20 kan imidlertid være glatte og bestå af ultralydreflekterende materiale, hvorhos deres overflader 21,22 skal forløbe således i forhold til væ-3o skens gennemstrømningsretning i målerøret, at de reflekterede ekkosignaler ikke forårsager nogen fejl under modtagefasen i måletransducerne 16 og 17. Sådanne udførelser er vist i fig. 2 og 3. Den i forhold til ultralydsignalernes løberetning på de mod måletransducerne 16,17 vendende si-35 der af manchetterne 19,21 skråt forløbende overflader 21, 22 har ifølge fig. 2 en i forhold til målerøret 7's akse symmetrisk og ifølge fig. 3 en i forhold til denne akse usymmetrisk anbringelse.However, the cuffs 19,20 may be smooth and consist of ultrasonic reflective material whose surfaces 21, 22 should extend so as to the flow direction of the liquid in the measuring tube so that the reflected echo signals cause no error during the receive phase of the measuring transducers 16 and 17. Such embodiments are shown in FIG. 2 and 3. The direction of travel of the ultrasound signals on the sides 35 of the sleeves 19, 21 facing the target transducers 16,17 has inclined surfaces 21, 22, according to FIG. 2 is a symmetrical relation to the axis of the measuring tube 7 and according to FIG. 3 is an asymmetrical arrangement relative to this axis.

DK 154246BDK 154246B

44

Anordningen 18 til undertrykkelse af de forstyrrende ekkosignaler kan også have en anden form. De skal i hvert fald svække signalerne, som udbreder sig udenfor målerøret 7, således at der ikke opstår nogen målefejl.The device 18 for suppressing the interfering echo signals may also have a different form. They must at least attenuate the signals which propagate outside the measuring tube 7 so that no measurement error occurs.

Claims (6)

1. Måleværdigiver til bestemmelse af gennemstrømningsmængden af en gennem et rørsystem strømmende væske ved måling af løbetiderne af ultralyd inden i væsken langs 5 en af væsken gennemstrømmet målestrækning, udstyret med, som storrumsfordelerkamre (3,4) udformede og med et målerør (7) forsynede tilslutningshoveder (1,2) for et tilog afløb for væsken og med ud for de to.ender (8,9) af målerøret, i tilslutningshovederne anbragte, med væsken i 1o umiddelbar berøring stående, måletransducere (16,17), hvor målerørets akse står vinkelret på centrene i deres aktive overføringsflader (14,15), k e n d e t e g n e t ved, at der findes en ultralydsignalundertrykkende anordning (18), som undertrykker de udenfor målerøret (7) af de aktive 15 overføringsflader (14,15) på måletransducerne (16,17) udsendte ultralydsignaler, således at der i modtagefasen ikke optages nogen forstyrrende ekkosignaler af måletransducerne (16,17) .1. Measuring value for determining the flow rate of a fluid flowing through a pipe system by measuring the maturity of ultrasound within the liquid along a flow line measured by the liquid, equipped with large space distribution chambers (3,4) and provided with a measuring tube (7) connection heads (1,2) for an additional drain for the liquid and with the two ends (8,9) of the measuring tube placed in the connection heads, with the liquid in immediate contact, measuring transducers (16,17), the axis of the measuring tube stands perpendicular to the centers of their active transfer surfaces (14, 15), characterized in that an ultrasonic suppressor device (18) exists which suppresses the outside measuring tube (7) of the active transfer surfaces (14, 15) of the target transducers (16, 17) emit ultrasound signals so that no interfering echo signals are received by the target transducers (16,17) in the receive phase. 2. Måleværdigiver ifølge krav 1, kendete g-2o net ved, at anordningen (18) til undertrykkelse af forstyrrende ekkosignaler fra det område, hvor målerøret (7) træder gennem fordelerkamrenes (3,4) fælles skillevæg (5, 6), er anbragt på målerøret (7) symmetrisk i forhold til denne skillevæg (5,6) . 252. Measuring value sensor according to claim 1, characterized in that the device (18) for suppressing interfering echo signals from the area where the measuring tube (7) passes through the common partition wall (5, 6) of the distributor chambers (3, 6) arranged on the measuring tube (7) symmetrical to this partition (5,6). 25 3. Måleværdigiver ifølge krav 1 og 2, kende tegnet ved, at anordningen (18) består af ultra-lyd-signalreflekterende manchetter (10,20), hvis mod de aktive overføringsflader (14,15) på måletransducerne (16,17) vendende flader (21,22) forløber skråt i forhold til ultralyd-3o signalernes løberetning og reflekterer ultralydsignalerne således, at der ikke kan optages forstyrrende ekkosignaler af måletransducerne (16,17).Measuring value sensor according to claims 1 and 2, characterized in that the device (18) consists of ultrasonic signal-reflecting cuffs (10, 20) facing towards the active transfer surfaces (14, 15) of the measuring transducers (16, 17). faces (21,22) extend obliquely to the direction of ultrasound-3o signals and reflect the ultrasound signals so that no disturbing echo signals can be recorded by the target transducers (16,17). 4. Måleværdigiver ifølge krav 1 og 2, kendetegnet ved, at anordningen (18) består af ultralyd- 35 absorberende materiale.Measuring value sensor according to claims 1 and 2, characterized in that the device (18) consists of ultrasonic absorbent material. 5. Måleværdigiver ifølge krav 3, kendetegnet ved, at de mod de aktive overføringsflader (14,15) på måletransducerne (16,17) vendende flader (21,22) har DK 154246 B en ultralydspredende overflade.'Measuring value sensor according to claim 3, characterized in that the surfaces (21,22) facing the active transfer surfaces (14,15) of the measuring transducers (16,17) have an ultrasonic spreading surface. 6. Måleværdigiver ifølge et hvilket som helst af de foregående krav, kendetegnet ved, at endefladerne på målerøret (7) er afskrået udadtil eller bearbejdet 5 runde.Measuring value sensor according to any of the preceding claims, characterized in that the end faces of the measuring tube (7) are bevelled outwards or machined 5 round.
DK422981A 1980-09-25 1981-09-24 MEASURING DIMENSIONS FOR DETERMINING THE FLOW AMOUNT OF A FLOWING FLUID DK154246C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH716780 1980-09-25
CH716780 1980-09-25

Publications (3)

Publication Number Publication Date
DK422981A DK422981A (en) 1982-03-26
DK154246B true DK154246B (en) 1988-10-24
DK154246C DK154246C (en) 1989-03-28

Family

ID=4320944

Family Applications (1)

Application Number Title Priority Date Filing Date
DK422981A DK154246C (en) 1980-09-25 1981-09-24 MEASURING DIMENSIONS FOR DETERMINING THE FLOW AMOUNT OF A FLOWING FLUID

Country Status (4)

Country Link
EP (1) EP0048791B1 (en)
AT (1) ATE14793T1 (en)
DE (1) DE3039710C2 (en)
DK (1) DK154246C (en)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH670156A5 (en) * 1986-06-17 1989-05-12 Landis & Gyr Gmbh
GB8813640D0 (en) * 1988-06-09 1988-07-13 Gill M J Speed measurement device
DE59007347D1 (en) * 1990-05-19 1994-11-03 Flowtec Ag Sensor for an ultrasonic volume flow meter.
GB9119742D0 (en) * 1991-09-16 1991-10-30 British Gas Plc Measurement system
DK0606536T3 (en) * 1993-01-11 1999-01-11 Landis & Gyr Tech Innovat Meter with ultrasonic transducer
FR2724016B1 (en) * 1994-08-23 1996-10-25 Schlumberger Ind Sa DEVICE FOR ULTRASONIC MEASUREMENT OF A VOLUME QUANTITY OF A FLUID WITH IMPROVED ACOUSTIC PROPERTIES
DE4439400C2 (en) * 1994-11-04 1997-08-14 Danfoss As Ultrasonic flow meter
FR2737564B1 (en) * 1995-08-04 1997-10-03 Schlumberger Ind Sa ULTRASONIC FLUID METER FOR MITIGATION OF INTERFERENCE ULTRASONIC WAVES
GB2301186A (en) * 1995-05-23 1996-11-27 Smith Meters Ltd Ultrasonic flow meter
GB2313910A (en) * 1996-06-07 1997-12-10 Kromschroeder Ag G Acoustic fluid flowmeter
FR2755231B1 (en) * 1996-10-28 1998-12-04 Schlumberger Ind Sa ULTRASONIC FLUID METER WITH IMPROVED RESISTANCE TO INTERESTED ULTRASONIC WAVES
FR2755233B1 (en) * 1996-10-28 1999-02-19 Schlumberger Ind Sa FLUID METER WITH IMPROVED RESISTANCE TO INTERESTED ULTRASONIC WAVES
FR2755232B1 (en) * 1996-10-28 1998-12-04 Schlumberger Ind Sa IMPROVED DUSTING RESISTANCE GAS METER
US6338277B1 (en) 1997-06-06 2002-01-15 G. Kromschroder Aktiengesellschaft Flowmeter for attenuating acoustic propagations
DE19731173C2 (en) * 1997-07-10 2001-12-13 Kundo Systemtechnik Gmbh Ultrasonic flow meter
EP2581715A1 (en) * 2011-10-13 2013-04-17 Miitors ApS Ultrasonic flow meter

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1032783B (en) * 1975-04-30 1979-06-20 Fiat Spa DEVICE FOR MEASURING THE FLOW IN MASS OF GAS BY ULTRASOUND
IT1071241B (en) * 1976-07-09 1985-04-02 Fiat Spa DEVICE TO PERFORM..ULTRASOUND MEDIUM..Measurement of the air flow in the mass in the intake duct of injection engines piloted by the device itself
DE2648718C2 (en) * 1976-10-27 1978-12-21 Danfoss A/S, Nordborg (Daenemark) Device that works with ultrasound to determine the physical quantities of a medium
FR2408119A1 (en) * 1977-11-04 1979-06-01 Mitsubishi Electric Corp FLOWMETER USING THE RUE DES VORTICES DE KARMAN
CH636701A5 (en) * 1979-06-08 1983-06-15 Landis & Gyr Ag TRANSDUCER FOR DETERMINING THE FLOW OF A pouring liquid with ULTRASOUND.

Also Published As

Publication number Publication date
ATE14793T1 (en) 1985-08-15
DK154246C (en) 1989-03-28
DE3039710A1 (en) 1982-07-08
DK422981A (en) 1982-03-26
EP0048791B1 (en) 1985-08-07
EP0048791A3 (en) 1983-06-15
EP0048791A2 (en) 1982-04-07
DE3039710C2 (en) 1983-01-13

Similar Documents

Publication Publication Date Title
DK154246B (en) MEASURING DIMENSIONS FOR DETERMINING THE FLOW AMOUNT OF A FLOWING FLUID
JPH05502295A (en) ultrasonic flow meter
US5383369A (en) Device for measuring the velocity of a fluid
BR9708962A (en) Apparatus for measuring the value of a gas
EP2824429A1 (en) An ultrasonic flowmeter
EA199700148A1 (en) ULTRASONIC FLOWMETER
DK144044B (en) ULTRA SOUND TEST PROBLEMS FOR USE IN ACOUSTIC MEASUREMENT OF WASHER DENSITY
JP3890698B2 (en) Flow measuring device
JP5046330B2 (en) Ultrasonic flowmeter and ultrasonic transducer unit
US6338277B1 (en) Flowmeter for attenuating acoustic propagations
SE8100474L (en) SHOOTING MEMORY WITH ELECTRONIC FIXING OF SHOOTING
AU641213B2 (en) Ultrasonic gas/liquid flow meter
US5969263A (en) Ultrasonic fluid counter for attenuating parasitic ultrasonic waves
US4502330A (en) Pulse-echo system for measuring parameters of a tubular test object
US20160161525A1 (en) Apparatus and a method for providing a time measurement
CN108240846B (en) Ultrasonic flow meter and method for measuring flow
RU2692824C1 (en) Ultrasonic flow rate measuring device and method of determining flow rate
FI102214B (en) Ultrasonic density meter for measuring the specific gravity of a fluid
SU1714372A1 (en) Ultrasonic flowmeter sensor
CN218628464U (en) Ultrasonic flowmeter
RU166612U1 (en) PRIMARY TRANSMITTER OF ULTRASONIC FLOW METER
JP2505647Y2 (en) Ultrasonic flow meter
JPH11281424A (en) Gas meter
RU192716U1 (en) Electronic-acoustic device for measuring the level, density and viscosity of liquid media
CN105333912A (en) Ultrasonic base table device

Legal Events

Date Code Title Description
PUP Patent expired