JPH0682281A - Vortex flowmeter - Google Patents
Vortex flowmeterInfo
- Publication number
- JPH0682281A JPH0682281A JP4233752A JP23375292A JPH0682281A JP H0682281 A JPH0682281 A JP H0682281A JP 4233752 A JP4233752 A JP 4233752A JP 23375292 A JP23375292 A JP 23375292A JP H0682281 A JPH0682281 A JP H0682281A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- circuit
- differential pressure
- pass filter
- vortex
- Prior art date
- Legal status (The legal status 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 status listed.)
- Pending
Links
Landscapes
- Measuring Volume Flow (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、カルマン渦による信号
が検出できない様な低流速に於いても流速流量が測定可
能な渦流量計に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vortex flowmeter capable of measuring a flow velocity flow rate even at a low flow velocity where a signal due to a Karman vortex cannot be detected.
【０００２】[0002]
【従来の技術】図２は、従来より一般に使用されている
従来例の構成説明図で、例えば、実開昭６２―１８６２
０号に示されている。図において、１は管路２に直交し
て挿入配置された柱状の渦発生体である。この場合は、
断面台形状をなす。３は、渦発生体１の上流側の管路２
に一端が開口する第１導圧管である。４は、第１導圧管
３の他端に一端が接続された差圧検出部である。５は、
差圧検出部４の他端に一端が接続され、他端が渦発生体
１の下流側の管路２に一端が開口する第２導圧管であ
る。2. Description of the Related Art FIG. 2 is an explanatory view of a configuration of a conventional example which has been generally used, for example, in Japanese Utility Model Publication 62-1862
No. 0 is shown. In the figure, 1 is a column-shaped vortex generator that is inserted and arranged orthogonally to the conduit 2. in this case,
It has a trapezoidal cross section. 3 is a pipe line 2 on the upstream side of the vortex generator 1.
It is a first pressure guiding tube having one end opened. Reference numeral 4 is a differential pressure detection unit whose one end is connected to the other end of the first pressure guiding tube 3. 5 is
One end is connected to the other end of the differential pressure detection unit 4, and the other end is a second pressure guiding pipe whose one end is open to the conduit 2 on the downstream side of the vortex generator 1.
【０００３】以上の構成において、測定流体が管路２に
流されると、発生する渦により、差圧検出部４は差圧の
変動を受ける。この変動の周波数を検出する事により、
流量が測定できる。In the above structure, when the measurement fluid is caused to flow in the conduit 2, the vortex generated causes the differential pressure detecting section 4 to undergo fluctuations in the differential pressure. By detecting the frequency of this fluctuation,
Flow rate can be measured.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、このよ
うな装置においては、カルマン渦が安定に発生する比較
的高流速（レイノルズ数≧５０００〜７０００）では精
度良く測定出来るが、カルマン渦が安定に発生しない低
流速では測定が困難であり、流量計出力は、流量０付近
で急激にゼロになる。However, in such an apparatus, although the Karman vortex can be accurately measured at a relatively high flow velocity (Reynolds number ≧ 5000 to 7000) in which the Karman vortex is stably generated, the Karman vortex is stably generated. It is difficult to measure at a low flow rate, and the output of the flowmeter suddenly becomes zero near zero flow rate.
【０００５】即ち、第１導圧管３と第２導圧管５との間
の差圧は、測定流速の変化に伴って、図２の様に変化す
る。流速が小さい時は、図２（ａ）に示す如く、 差圧の直流成分：小、 差圧の交流成分の振幅：小、 差圧の交流成分の周波数：低である。That is, between the first pressure guiding pipe 3 and the second pressure guiding pipe 5.
The differential pressure of changes with the change of the measurement flow velocity as shown in Fig. 2.
It When the flow velocity is low, as shown in FIG. DC component of differential pressure: small, Amplitude of AC component of differential pressure: small, Frequency of AC component of differential pressure: low.
【０００６】流速が大きく成ると、図２（ｂ）に示す如
く、 差圧の直流成分：大、 差圧の交流成分の振幅：大、 差圧の交流成分の周波数：高である。 従来の差圧検出形の渦流量計では、交流成分のみ検出し
ているので、低流速時には、測定流体の流速が測定出来
ない。As the flow velocity increases, as shown in FIG. 2B, the DC component of the differential pressure is large, the amplitude of the AC component of the differential pressure is large, and the frequency of the AC component of the differential pressure is high. Since the conventional differential pressure detection vortex flowmeter detects only the AC component, the flow velocity of the measurement fluid cannot be measured when the flow velocity is low.
【０００７】ここで、 差圧の直流成分∝ρｖ2 差圧の交流成分の周波数ｆ＝Ｓt（ｖ／ｄ） 差圧の交流成分の振幅∝ρｖ2 [0007] Here, the frequency f = S t (v / d ) differential pressure of the AC component of the AC component of the DC component Arufarov 2 differential pressure of the differential pressure amplitude Arufarov 2
【０００８】本発明は、この問題点を、解決するもので
ある。本発明の目的は、カルマン渦による信号が検出で
きない様な低流速に於いても流速流量が測定可能な渦流
量計を提供するにある。The present invention solves this problem. An object of the present invention is to provide a vortex flowmeter capable of measuring a flow velocity flow rate even at a low flow velocity where a signal due to a Karman vortex cannot be detected.
【０００９】[0009]
【課題を解決するための手段】この目的を達成するため
に、本発明は、管路に直交して挿入配置された柱状の渦
発生体と、該渦発生体の上流側の前記管路に一端が開口
する第１導圧管と、該第１導圧管の他端に一端が接続さ
れた差圧検出部と、該差圧検出部の他端に一端が接続さ
れ他端が前記渦発生体の下流側の前記管路に一端が開口
する第２導圧管とを具備する渦流量計において、前記差
圧検出部に接続された信号変換回路と、該信号変換回路
に接続され直流信号成分を検出するローパスフィルター
回路と、該ローパスフィルター回路の信号を平滑化する
平滑回路と、前記信号変換回路に接続され周波数信号成
分を検出するハイパスフィルター回路と、該ハイパスフ
ィルター回路の信号をパルス信号に変換するシュミット
トリガー回路と、該シュミットトリガー回路の信号を電
圧に変換するＦ／Ｖ変換回路と、前記平滑回路の信号が
所定値を越えない迄は平滑回路の信号を出力し所定値を
越えた場合には切り替えて前記Ｆ／Ｖ変換回路の出力を
出力する切り替えスイッチとを具備したことを特徴とす
る渦流量計を構成したものである。In order to achieve this object, the present invention provides a columnar vortex generator inserted and arranged orthogonally to the pipe line and the pipe line on the upstream side of the vortex generator. A first pressure guiding tube having one end opened, a differential pressure detecting section having one end connected to the other end of the first pressure guiding tube, one end connected to the other end of the differential pressure detecting section, and the other end having the vortex generator. A vortex flowmeter having a second pressure guiding pipe having one end opened to the pipe line on the downstream side of the signal conversion circuit connected to the differential pressure detection unit and a DC signal component connected to the signal conversion circuit. A low-pass filter circuit for detecting, a smoothing circuit for smoothing the signal of the low-pass filter circuit, a high-pass filter circuit connected to the signal conversion circuit for detecting a frequency signal component, and a signal of the high-pass filter circuit converted to a pulse signal Schmitt trigger circuit An F / V conversion circuit for converting the signal of the Schmitt trigger circuit into a voltage, and a signal of the smoothing circuit is output until the signal of the smoothing circuit does not exceed a predetermined value, and when the signal exceeds the predetermined value, the F / V conversion circuit is switched. A vortex flowmeter comprising a changeover switch for outputting the output of the V conversion circuit.
【００１０】[0010]
【作用】以上の構成において、カルマン渦が安定に発生
する前の低流速領域では、差圧検出部により検出された
差圧の直流成分を検出し、この出力を流量計信号として
出力する。カルマン渦が安定に発生する高流速領域の測
定では、切り替えスイッチで切り替え、流速に比例した
渦発生に基づく周波数をハイパスフィルター回路で検出
し、シュミットトリガー回路でパルス信号に変換し、Ｆ
／Ｖ変換回路でパルス信号に変換して、流量計信号とし
て出力する。以下、実施例に基づき詳細に説明する。In the above structure, in the low flow velocity region before the Karman vortex is stably generated, the DC component of the differential pressure detected by the differential pressure detection unit is detected and this output is output as the flow meter signal. In the high-velocity region where Karman vortices are stably generated, the changeover switch is used to switch the frequency. The high-pass filter circuit detects the frequency based on the vortex generation that is proportional to the flow velocity, and the Schmitt trigger circuit converts it to a pulse signal.
The / V conversion circuit converts it into a pulse signal and outputs it as a flow meter signal. Hereinafter, detailed description will be given based on examples.
【００１１】[0011]
【実施例】図１は本発明の一実施例の要部構成説明図で
ある。図において、図２と同一記号の構成は同一機能を
表わす。以下、図２と相違部分のみ説明する。１１，１
２は、管路２の内壁に設けられたダイアフラムである。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory view of the essential structure of an embodiment of the present invention. In the figure, the same symbols as those in FIG. 2 represent the same functions. Only parts different from FIG. 2 will be described below. 11, 1
Reference numeral 2 is a diaphragm provided on the inner wall of the conduit 2.
【００１２】１３は差圧エレメントで、この場合は、容
量形の差圧エレメントが使用されている。１４は第１導
圧管、１５は第２導圧管である。１６，１７は、導管中
に封入されたシリコンオイル等の封入液である。ダイア
フラム１１，１２の圧力差が差圧エレメント１３で検出
される。Reference numeral 13 is a differential pressure element, and in this case, a capacitive type differential pressure element is used. Reference numeral 14 is a first pressure guiding tube, and 15 is a second pressure guiding tube. Reference numerals 16 and 17 are filled liquids such as silicone oil filled in the conduit. The pressure difference between the diaphragms 11 and 12 is detected by the pressure difference element 13.
【００１３】２１は差圧検出部に接続された信号変換回
路である。２２は、信号変換回路２１に接続され直流信
号成分を検出するローパスフィルター回路である。２３
は、ローパスフィルター回路２２の信号を平滑化する平
滑回路である。２４は、信号変換回路２１に接続され周
波数信号成分を検出するハイパスフィルター回路であ
る。Reference numeral 21 is a signal conversion circuit connected to the differential pressure detector. A low-pass filter circuit 22 is connected to the signal conversion circuit 21 and detects a DC signal component. 23
Is a smoothing circuit that smoothes the signal of the low-pass filter circuit 22. A high-pass filter circuit 24 is connected to the signal conversion circuit 21 and detects a frequency signal component.
【００１４】２５は、ハイパスフィルター回路２４の信
号をパルス信号に変換するシュミットトリガー回路であ
る。２６は，シュミットトリガー回路２５の信号を電圧
に変換するＦ／Ｖ変換回路である。２７は、平滑回路２
３の信号が所定値を越えない迄は平滑回路２３の信号を
出力し、所定値を越えた場合には切り替えてＦ／Ｖ変換
回路２６の出力を出力する切り替えスイッチである。Reference numeral 25 is a Schmitt trigger circuit for converting the signal of the high pass filter circuit 24 into a pulse signal. Reference numeral 26 is an F / V conversion circuit that converts the signal of the Schmitt trigger circuit 25 into a voltage. 27 is a smoothing circuit 2
The changeover switch outputs the signal of the smoothing circuit 23 until the signal of No. 3 does not exceed the predetermined value, and switches the signal of the smoothing circuit 23 to output the output of the F / V conversion circuit 26 when it exceeds the predetermined value.
【００１５】以上の構成において、カルマン渦が安定に
発生する前の低流速領域では、差圧検出部１３により検
出された差圧の直流成分を検出し、この出力を流量計信
号として出力する。カルマン渦が安定に発生する高流速
領域の測定では、切り替えスイッチ２７で切り替え、流
速に比例した渦発生に基づく周波数をハイパスフィルタ
ー回路２４で検出し、シュミットトリガー回路２５でパ
ルス信号に変換し、Ｆ／Ｖ変換回路２６でパルス信号に
変換して、流量計信号として出力する。In the above structure, in the low flow velocity region before the Karman vortex is stably generated, the DC component of the differential pressure detected by the differential pressure detection unit 13 is detected, and this output is output as a flow meter signal. In the measurement of the high flow velocity region where the Karman vortex is stably generated, the changeover switch 27 is used for switching, the frequency based on the vortex generation proportional to the flow velocity is detected by the high-pass filter circuit 24, and the Schmitt trigger circuit 25 converts it into a pulse signal. The / V conversion circuit 26 converts it into a pulse signal and outputs it as a flow meter signal.
【００１６】この結果、カルマン渦が安定に発生する前
の低流速領域では、差圧検出部１３により検出された差
圧の直流成分を検出し、この出力を流量計信号として出
力する様にしたので、これまでの、渦流量計の欠点であ
ったカルマン渦が安定に発生しない低流速域での精度の
良い測定が可能となる。As a result, in the low flow velocity region before the Karman vortex is stably generated, the DC component of the differential pressure detected by the differential pressure detection unit 13 is detected, and this output is output as a flow meter signal. Therefore, it is possible to perform accurate measurement in a low flow velocity region where the Karman vortex, which has been a drawback of the vortex flowmeter, does not stably occur.
【００１７】[0017]
【発明の効果】以上説明したように、本発明は管路に直
交して挿入配置された柱状の渦発生体と、該渦発生体の
上流側の前記管路に一端が開口する第１導圧管と、該第
１導圧管の他端に一端が接続された差圧検出部と、該差
圧検出部の他端に一端が接続され他端が前記渦発生体の
下流側の前記管路に一端が開口する第２導圧管とを具備
する渦流量計において、前記差圧検出部に接続された信
号変換回路と、該信号変換回路に接続され直流信号成分
を検出するローパスフィルター回路と、該ローパスフィ
ルター回路の信号を平滑化する平滑回路と、前記信号変
換回路に接続され周波数信号成分を検出するハイパスフ
ィルター回路と、該ハイパスフィルター回路の信号をパ
ルス信号に変換するシュミットトリガー回路と、該シュ
ミットトリガー回路の信号を電圧に変換するＦ／Ｖ変換
回路と、前記平滑回路の信号が所定値を越えない迄は平
滑回路の信号を出力し所定値を越えた場合には切り替え
て前記Ｆ／Ｖ変換回路の出力を出力する切り替えスイッ
チとを具備したことを特徴とする渦流量計を構成した。As described above, according to the present invention, the columnar vortex generator inserted and arranged orthogonally to the pipe, and the first guide having one end open to the pipe on the upstream side of the vortex generator. A pressure pipe, a differential pressure detection unit having one end connected to the other end of the first pressure guiding pipe, and the pipe line having one end connected to the other end of the differential pressure detection unit and the other end downstream of the vortex generator. In a vortex flowmeter having a second pressure guiding tube whose one end is open, a signal conversion circuit connected to the differential pressure detection unit, and a low-pass filter circuit connected to the signal conversion circuit for detecting a DC signal component, A smoothing circuit for smoothing the signal of the low-pass filter circuit, a high-pass filter circuit connected to the signal conversion circuit for detecting a frequency signal component, a Schmitt trigger circuit for converting the signal of the high-pass filter circuit into a pulse signal, Schmidt trigger times F / V conversion circuit for converting the signal of the above into a voltage, and the signal of the smoothing circuit is output until the signal of the smoothing circuit does not exceed a predetermined value, and when the signal exceeds the predetermined value, the F / V conversion circuit is switched. And a changeover switch for outputting the output of the vortex flowmeter.
【００１８】この結果、カルマン渦が安定に発生する前
の低流速領域では、差圧検出部により検出された差圧の
直流成分を検出し、この出力を流量計信号として出力す
る様にしたので、これまでの、渦流量計の欠点であった
カルマン渦が安定に発生しない低流速域での精度の良い
測定が可能となる渦流量計が得られる。As a result, in the low flow velocity region before the Karman vortex is stably generated, the DC component of the differential pressure detected by the differential pressure detector is detected, and this output is output as a flow meter signal. Thus, a vortex flowmeter capable of performing accurate measurement in a low flow velocity region where the Karman vortex, which has been a defect of the vortex flowmeter until now, is not stably generated can be obtained.
【００１９】従って、本発明によれば、カルマン渦によ
る信号が検出できない様な低流速に於いても流速流量が
測定可能な渦流量計を実現することが出来る。Therefore, according to the present invention, it is possible to realize a vortex flowmeter capable of measuring a flow velocity flow rate even at a low flow velocity where a signal due to a Karman vortex cannot be detected.
【図１】本発明の一実施例の要部構成説明図である。FIG. 1 is an explanatory diagram of a main part configuration of an embodiment of the present invention.
【図２】従来より一般に使用されている従来例の構成説
明図である。FIG. 2 is an explanatory diagram of a configuration of a conventional example that is generally used in the past.
【図３】図２の動作説明図である。FIG. 3 is an operation explanatory diagram of FIG. 2;
１…渦発生体 ２…管路 １１…ダイアフラム １２…ダイアフラム １３…差圧エレメント １４…第１導圧管 １５…第２導圧管 １６…封入液 １７…封入液 ２１…信号変換回路 ２２…ロウパスフィルター回路 ２３…平滑回路 ２４…ハイパスフィルター回路 ２５…シュミットトリガー回路 ２６…Ｆ／Ｖ変換回路 ２７…切り替えスイッチ DESCRIPTION OF SYMBOLS 1 ... Vortex generator 2 ... Pipeline 11 ... Diaphragm 12 ... Diaphragm 13 ... Differential pressure element 14 ... First pressure guiding tube 15 ... Second pressure guiding tube 16 ... Filled liquid 17 ... Filled liquid 21 ... Signal conversion circuit 22 ... Low pass filter Circuit 23 ... Smoothing circuit 24 ... High pass filter circuit 25 ... Schmidt trigger circuit 26 ... F / V conversion circuit 27 ... Changeover switch
Claims (1)
生体と、該渦発生体の上流側の前記管路に一端が開口す
る第１導圧管と、該第１導圧管の他端に一端が接続され
た差圧検出部と、該差圧検出部の他端に一端が接続され
他端が前記渦発生体の下流側の前記管路に一端が開口す
る第２導圧管とを具備する渦流量計において、 前記差圧検出部に接続された信号変換回路と、 該信号変換回路に接続され直流信号成分を検出するロー
パスフィルター回路と、 該ローパスフィルター回路の信号を平滑化する平滑回路
と、 前記信号変換回路に接続され周波数信号成分を検出する
ハイパスフィルター回路と、 該ハイパスフィルター回路の信号をパルス信号に変換す
るシュミットトリガー回路と、 該シュミットトリガー回路の信号を電圧に変換するＦ／
Ｖ変換回路と、 前記平滑回路の信号が所定値を越えない迄は平滑回路の
信号を出力し所定値を越えた場合には切り替えて前記Ｆ
／Ｖ変換回路の出力を出力する切り替えスイッチとを具
備したことを特徴とする渦流量計。1. A columnar vortex generator inserted and arranged orthogonally to a pipe line, a first pressure guiding pipe having one end opened to the pipe line upstream of the vortex generating body, and a first pressure guiding pipe of the first pressure guiding pipe. A differential pressure detection unit having one end connected to the other end, and a second pressure guiding pipe having one end connected to the other end of the differential pressure detection unit and the other end having one end opening to the conduit on the downstream side of the vortex generator. A vortex flowmeter comprising: a signal conversion circuit connected to the differential pressure detection unit; a low-pass filter circuit connected to the signal conversion circuit for detecting a DC signal component; and a signal of the low-pass filter circuit smoothed. Smoothing circuit, a high-pass filter circuit connected to the signal conversion circuit to detect a frequency signal component, a Schmitt trigger circuit that converts the signal of the high-pass filter circuit into a pulse signal, and a signal of the Schmitt trigger circuit into a voltage Do F
The signal from the V conversion circuit and the smoothing circuit is output until the signal from the smoothing circuit does not exceed a predetermined value, and the signal is switched when the signal from the smoothing circuit exceeds the predetermined value.
A vortex flowmeter, comprising a changeover switch for outputting the output of the / V conversion circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4233752A JPH0682281A (en) | 1992-09-01 | 1992-09-01 | Vortex flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4233752A JPH0682281A (en) | 1992-09-01 | 1992-09-01 | Vortex flowmeter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0682281A true JPH0682281A (en) | 1994-03-22 |
Family
ID=16960027
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4233752A Pending JPH0682281A (en) | 1992-09-01 | 1992-09-01 | Vortex flowmeter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0682281A (en) |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6691584B2 (en) | 1999-07-02 | 2004-02-17 | Weatherford/Lamb, Inc. | Flow rate measurement using unsteady pressures |
| US6698297B2 (en) | 2002-06-28 | 2004-03-02 | Weatherford/Lamb, Inc. | Venturi augmented flow meter |
| US6782150B2 (en) | 2000-11-29 | 2004-08-24 | Weatherford/Lamb, Inc. | Apparatus for sensing fluid in a pipe |
| US6813962B2 (en) | 2000-03-07 | 2004-11-09 | Weatherford/Lamb, Inc. | Distributed sound speed measurements for multiphase flow measurement |
| US6862920B2 (en) | 1998-06-26 | 2005-03-08 | Weatherford/Lamb, Inc. | Fluid parameter measurement in pipes using acoustic pressures |
| US6971259B2 (en) | 2001-11-07 | 2005-12-06 | Weatherford/Lamb, Inc. | Fluid density measurement in pipes using acoustic pressures |
| US6986276B2 (en) | 2003-03-07 | 2006-01-17 | Weatherford/Lamb, Inc. | Deployable mandrel for downhole measurements |
| US7028538B2 (en) | 2003-03-19 | 2006-04-18 | Weatherford/Lamb, Inc. | Sand monitoring within wells using acoustic arrays |
| JP2008089373A (en) * | 2006-09-29 | 2008-04-17 | Oval Corp | Flow measurement by coriolis flowmeter, and flow controller |
| CN101825485A (en) * | 2010-05-07 | 2010-09-08 | 上海肯特仪表股份有限公司 | Self-adaptive signal processing circuit of vortex shedding flowmeter and signal processing method thereof |
| WO2010141234A1 (en) | 2009-06-04 | 2010-12-09 | Invensys Systems, Inc. | Small line size vortex flowmeter |
| WO2019129480A1 (en) | 2017-12-29 | 2019-07-04 | Endress+Hauser Flowtec Ag | Tube for a transducer, transducer comprising such a tube, and measuring system formed therewith |
| DE102018110456A1 (en) * | 2018-05-02 | 2019-11-07 | Endress + Hauser Flowtec Ag | Measuring system and method for measuring a measured variable of a flowing fluid |
| CN111854869A (en) * | 2020-08-22 | 2020-10-30 | 承德菲时博特自动化设备有限公司 | Precession vortex differential pressure type mass flowmeter |
| JP2021067640A (en) * | 2019-10-28 | 2021-04-30 | 株式会社Ｓｕｂａｒｕ | Differential pressure measuring device |
-
1992
- 1992-09-01 JP JP4233752A patent/JPH0682281A/en active Pending
Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6862920B2 (en) | 1998-06-26 | 2005-03-08 | Weatherford/Lamb, Inc. | Fluid parameter measurement in pipes using acoustic pressures |
| US6691584B2 (en) | 1999-07-02 | 2004-02-17 | Weatherford/Lamb, Inc. | Flow rate measurement using unsteady pressures |
| US6813962B2 (en) | 2000-03-07 | 2004-11-09 | Weatherford/Lamb, Inc. | Distributed sound speed measurements for multiphase flow measurement |
| US6782150B2 (en) | 2000-11-29 | 2004-08-24 | Weatherford/Lamb, Inc. | Apparatus for sensing fluid in a pipe |
| US6971259B2 (en) | 2001-11-07 | 2005-12-06 | Weatherford/Lamb, Inc. | Fluid density measurement in pipes using acoustic pressures |
| US6698297B2 (en) | 2002-06-28 | 2004-03-02 | Weatherford/Lamb, Inc. | Venturi augmented flow meter |
| US6986276B2 (en) | 2003-03-07 | 2006-01-17 | Weatherford/Lamb, Inc. | Deployable mandrel for downhole measurements |
| US7028538B2 (en) | 2003-03-19 | 2006-04-18 | Weatherford/Lamb, Inc. | Sand monitoring within wells using acoustic arrays |
| JP2008089373A (en) * | 2006-09-29 | 2008-04-17 | Oval Corp | Flow measurement by coriolis flowmeter, and flow controller |
| WO2010141234A1 (en) | 2009-06-04 | 2010-12-09 | Invensys Systems, Inc. | Small line size vortex flowmeter |
| EP2438404A4 (en) * | 2009-06-04 | 2017-07-05 | Invensys Systems, Inc. | Small line size vortex flowmeter |
| CN101825485A (en) * | 2010-05-07 | 2010-09-08 | 上海肯特仪表股份有限公司 | Self-adaptive signal processing circuit of vortex shedding flowmeter and signal processing method thereof |
| CN101825485B (en) * | 2010-05-07 | 2015-04-01 | 上海肯特仪表股份有限公司 | Self-adaptive signal processing circuit of vortex flowmeter and signal processing method thereof |
| WO2019129480A1 (en) | 2017-12-29 | 2019-07-04 | Endress+Hauser Flowtec Ag | Tube for a transducer, transducer comprising such a tube, and measuring system formed therewith |
| DE102017012067A1 (en) | 2017-12-29 | 2019-07-04 | Endress+Hauser Flowtec Ag | Pipe for a transducer, transducer with such a tube and thus formed measuring system |
| US11441930B2 (en) | 2017-12-29 | 2022-09-13 | Endress+Hauser Flowtec Ag | Tube for a transducer, transducer comprising such a tube, and measuring system formed therewith |
| DE102018110456A1 (en) * | 2018-05-02 | 2019-11-07 | Endress + Hauser Flowtec Ag | Measuring system and method for measuring a measured variable of a flowing fluid |
| WO2019211074A1 (en) | 2018-05-02 | 2019-11-07 | Endress+Hauser Flowtec Ag | Measuring system and method for measuring a measurement variable of a flowing fluid |
| US11906335B2 (en) | 2018-05-02 | 2024-02-20 | Endress+Hauser Flowtec Ag | Measuring system and method for measuring a measurement variable of a flowing fluid |
| JP2021067640A (en) * | 2019-10-28 | 2021-04-30 | 株式会社Ｓｕｂａｒｕ | Differential pressure measuring device |
| CN111854869A (en) * | 2020-08-22 | 2020-10-30 | 承德菲时博特自动化设备有限公司 | Precession vortex differential pressure type mass flowmeter |
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