GB2257789A - Oscillatory vane sensor for fluid flow - Google Patents
Oscillatory vane sensor for fluid flow Download PDFInfo
- Publication number
- GB2257789A GB2257789A GB9210407A GB9210407A GB2257789A GB 2257789 A GB2257789 A GB 2257789A GB 9210407 A GB9210407 A GB 9210407A GB 9210407 A GB9210407 A GB 9210407A GB 2257789 A GB2257789 A GB 2257789A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sensor
- sensing element
- fluid
- conduit
- casing
- 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.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
- G01D5/20—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature
- G01D5/2006—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the self-induction of one or more coils
- G01D5/2013—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the self-induction of one or more coils by a movable ferromagnetic element, e.g. a core
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
- G01D5/20—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature
- G01D5/2006—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the self-induction of one or more coils
- G01D5/2033—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the self-induction of one or more coils controlling the saturation of a magnetic circuit by means of a movable element, e.g. a magnet
-
- 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
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P13/00—Indicating or recording presence, absence, or direction, of movement
- G01P13/0006—Indicating or recording presence, absence, or direction, of movement of fluids or of granulous or powder-like substances
- G01P13/0026—Indicating or recording presence, absence, or direction, of movement of fluids or of granulous or powder-like substances by using deflection of baffle-plates
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P13/00—Indicating or recording presence, absence, or direction, of movement
- G01P13/0006—Indicating or recording presence, absence, or direction, of movement of fluids or of granulous or powder-like substances
- G01P13/0073—Indicating or recording presence, absence, or direction, of movement of fluids or of granulous or powder-like substances by using vibrations generated by the fluid
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Measuring Volume Flow (AREA)
Description
2 5 7 7 3 9
BACKGROUND OF THE INVENTION
The present invention relates to a sensor for detecting various properties of a fluid flowing within a conduit. The sensor of the present invention has particular utility in the measurement of the properties of a fluid such as oil flowing through a pipeline.
oil which is extracted from wells typically comprises a two-phase fluid which contains a gas phase and a liquid phase. One of the most important variables to be detected and controlled in a well production pipeline is the proportion of gas in the crude oil. As a consequence of this, a variety of different methods and systems are employed for detecting the presence of gas within the flowing oil.
Among the knovn techniques for detecting the flow of two-phase fluids is the measurement of changes in the electrical resistance of the two-phase flow, being monitored. The apparatus which is employed to -Ieasure these changes generally has a sensing part which comprises a pair of electrodes to which a predeterTined voltage is applied. When the sensing part is immersed in a liquid phase of the flow, the resistance between the two electrodes has a specific value related to the nature of the liquid being monitored. If, however, the sensing part is in a gaseous phase of the flow, the two 1 A_ electrodes are substantially insulated since the resistance has an extremely large value. There are several disadvantages attendant to this method. For example, this technique is ineffective for non-conductive liquids such as oil. Further, there is a substantial risk that a chemical reaction will occur in conductive liquids due to the current flow from the applied voltage.
U.S. Patent No. 4,286,208 to French et al.
illustrates a detector for detecting the interface of two fluids at a particular level. The interface detector includes a circuit for detecting the presence of at least two fluids to establish an interface level ion circuit produces an output 1-herebetween. The detec. signal having a variable pulse width which is determined by the nature of the fluid which is present. The detector further includes at least one circuit for producing a reference signal having a predetermined pulse width, and means for comparing the pulse width of the output signal of the detection circuit to the predetermined pulse width of the reference signal. An output signal is produced which is indicative of whether a first fluid or a second fluid is present. The detection circuit utilizes one or more capacitive sensing devices which capacitively transmit a series of electrical pulses. The electrical pulses are modified as an electrically conductive liquid which is grounded is moved into close proximity to each capacitive sensing device. The modification of the electrical pulses is converted by the detection circuit to an output signal having various pulse widths. For each additional capacitive sensing device included in the detection circuit, the fluid interface detector includes a sensor for producing additional reference signals, each of which has a difference predetermined pulse width and an additional means for comparing each reference signal of the reference circuit to the output signal of the detection circuit. In this manner, the French et al. detector detects which one of two fluids is prese Another technique for detecting the flow of gas-liquid, two-phase fluids utilizes measurement light intensity changes. In this technique, the apparatus typically consists of an optical fiber bent to a U-shape. A portion of the fibrous protective coating is removed. The exposed portion is then used as a sensing part which is placed in the two-phase flow. When the sensing part is in the liquid phase, the output light intensity from the other end of the optical fiber decreases because part of the light stays in the liquid (the difference between the refraction indices of the nt.
liquid and the fiber being very small). When the sensing part is in the gas phase, the light is totally reflected and the output intensity is substantially the same as the input. It has been found that this technique is ineffective in the presence of small bubbles and in the presence of very viscous liquids such as crude oils.
U.S. Patent No. 4,516,432 to Hironaga et al. illustrates an apparatus for measuring gas-liquid, two-phase flow which employs an optical fiber positioned perpendicular to the flow direction. one of the deficiencies of the apparatus employed by Hironaga et al. is that residues accumulate on the optical windows and consequently the windows continually need to be cleaned.
One of the problems attendant to production well pipelines is that great damage can occur to pistons in p 4 iston pumps if there is a disproportionate amount of gas to liquid in the fluid flowing through the pipeline. Thus, there is a need for an improved sensor which has particular utility in monitoring the flow throuch oil well production pipelines wherein the flow includes a non-conductive liquid such as oil and a gaseous phase. It is desirable that the sensor be able to be controlled from a remote supervision system so as to be able to detect incipient failures in wells before substantial damage occurs.
Accordingly, it is an object of the present invention to provide a sensor which can detect the flow of a gas-liquid fluid through a production well pipeline.
It is a further object of the present invention to provide a sensor as above which identifies liquids of different viscosity flowing through a pipeline when the volume of liquid flowing through the pipeline is maintained substantially constant.
It is yet a further object of the present invention L.o provide a sensor which can also be used as a simple flow detector and as a flow meter in the case of homogeneous fluids flowing through a pipeline.
It is yet another object of the present invention to provide a sensor as above which provides means to detect the flow of gas-liquid, two-phase fluids.
These and other objects and advantages will become more apparent from the following description and drawings in which like reference numerals depict like elements.
SUMMARY OF THE INTVENTION
The foregoing objects and advantages are obtained by the sensor of the present invention. The sensor c comprises a movable sensing element located within a conduit and which is at least partially immersed within the fluid flowing through the conduit or pipeline, means for detecting movement of the sensing element as a result of any displacement due to the flow of fluid, and means for generating an electric signal representative of the detected fluid in response to the detected movement of the sensing element. In a preferred embodiment of the present invention, the sensing element comprises a rod formed from a non-magnetic material supported within a housing structure for oscillatory movement. The sensing element further comprises a head member attached to one end of the rod which is formed from a magnetic material such as a ferromagnetic material or a permanent magnet. The head member is displaced from its neutral position as fluid strikes the sensing element. Two electric coils are supported within a casing for generating a magnetic field. By monitoring changes in the magnetic field due to displacement of the magnetic head member, one can determine various properties of the fluid flow in the pipeline. For example, if the flow of fluid through the pipeline is homogeneous, i.e. gas or liquid, one can use the sensor to measure the rate of flow. Alternatively, the sensor could be used merely to detect the presence or the lack of flow in the pipeline. Still further, where the fluid flows at a constant rate and wherein there are two components with significantly different viscosities, one can detect variations in the proportions of the two components of the fluid with sensor of the present invention.
Further details about the sensor can be ascertained from the following description.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 illustrates a transverse partial sectional view of a pipeline provided with the sensor of the present invention.
Figure 2 is a longitudinal partial sectional view of a pipeline provided with a sensor of the present invention.
Figure 3 is a partial frontal section view of the sensor of the present invention.
Figure 4 is a sectional side view of the sensor of the present invention.
Figure 5 is an exploded view of the sensor of the present invention.
9 DETAILED DESCRIPTION
With reference to the accompanying drawings, and particularly Figures 1 through 5, the sensor 10 of the present inventio n comprises a casing portion 12 in a housing portion 14. The casing portion 12 is provided on the exterior surface thereof with threads 16 for fitting the sensor 10 within a fitting 18 provided on conduit 20 so that housing 14 projects into the conduit 20. Any suitable thread may be used for casing 12 and fitting 18 such as, for example, a NPT thread.
The housing portion 14 of sensor 10 has secured thereto a sensing element 22 in the form of a sensor plate. The sensor plate 22 is fixed to the bottom wall 24 of the housing 14 in any suitable manner such as spot welding or the like and, as can be seen more clearly in Figure 3, is located on wall 24 midway between side walls 26 and 28 of housing 14. The sensor plate 22 is thus mounted within the housing 14 so as to allow for oscillatory movement between a neutral position in a variety of measuring positions upon the flow of a medium in the conduit which contacts the sensor plate 22.
In accordance with the present invention the sensor plate 22 is preferably formed from a non-magnetic material such as stainless steel or the like. In accordance with the present invention, the end of the q sensor plate 22 opposite that end fixed to housing 14 is provided with a head member 30 secured thereto. The head member 30 is formed of a magnetic material such as a ferromagnetic material or, in the alternative, may be in the form of a permanent magnet.
As can best be seen in Figures 3 and 5, housing 14 and correspondingly sensor plate 22 are secured to the casing 12 by means of screws 32. The sensor plate 22 which is fixed to bottom wall 24 of housing 14 can have any desired thickness depending upon the rigidity to be imparted to it and a width which depends upon the viscosity of the fluid being monitored within the conduit. For example, if the fluid is a very viscous crude oil then a narrow plate is suitable; however, if the fluid is one of low viscosity a wider plate is desired in order to provide for measurable flexion of the sensor plate 22. As can be seen in the drawings, the sensor plate 22 is supported within the housing such that its width is substantially perpendicular to the direction of flow of the fluid in the pipeline. As noted above, the sensitivity of the sensor plate 22 with respect to flow in the pipeline is directly related to the width of the plate. In addition, it is desirable to use a relatively wide plate in the event that the volume of fluid flowing through the conduit is small.
Casing 12 of the sensor 10 is provided with a pair of bore holes 34 which receive a pair of electrical coils 36a and 36b. The coils 36a and 36b and casing 12 are separated from the fluid in conduit 20 and head member 30 on sensor plate 22 by means of seal 38 which is held against casing 12 and coils 36a and 36b by means of nut 40.. Seal 38 prevents fluid from the Pipeline from entering into the casing 12 in contacting electric coils 36a and 36b. The seal 38 is preferably in the form of a stainless steel plate having a thickness within the range of from about 0.1 to about 2.0 mm.
In accordance with the present invention, the electrical coils 36a and 36b are used to generate a pair of magnetic fields. The generated magnetic fields are in turn used to sense the location of the magnetic head member 30 on sensor plate 22. The electric coils 36a and 36b are preferably connected in a half bridge configuration and additionally are connected to any standard commercially available electric circuitry for amplifying and treating signals from the coils with respect to the displacement of the head member and a monitoring condition of the flow in the pipeline. Typical available commercial electronic circuitry is useable with the sensor of the present invention. The circuitry is used to amplify and treat the electrical 11 signals generated by the coils 36a and 36b and produces an output signal for use by an instrument such as a recording device. Typically, the commercially available circuit generates an output signal in the standard range of from about 4 to 20 mA.
As previously discussed, the sensor 10 of the present invention can be used to monitor a variety of parameters relating to the flow through the conduit 20. For example, it may be used to measure the amount of gas in the oil flowing through the conduit. It should be recognized that when the fluid flowing through the pipeline is a liquid such as crude oil, the viscosity of the liquid is relatively high. Therefore, when the fluid hits the sensor plate 22, a force is created which causes -1he plate to move about a pivot point created by the spot weld of the plate 22 to housing 14. Movement of the plate from its neutral position displaces the end containing the magnetic head member 30. Displacement of the head member 30 in turn causes a variation in the magnetic field generated by each coil, 36a and 36b, which variation can be measured. The measured variation is then processed by the commercial circuit so as to generate an output signal which is representative of the fluid flowing through the conduit.
i? If the fluid flowing through the conduit is gas, there will be substantially no change in the magnetic fields produced by the coils resulting in no electronic signal. The absence of any change in the magnetic field is due to the relatively low viscosity of the gas flowing through the pipeline and the absence of any significant sensing plate deflection.
If the fluid flowing through the pipeline is a two-phase, gas-liquid fluid, deflection of the plate 22 will occur which will produce an electrical signal which will increase with an increase in the liquid phase and the increased deflection of plate 22.
correspondingly The sensor of the present invention can be used as a meter for monitoring fluids having substantially different viscosities. one can calibrate the sensor plate 22 so that its output signal can be used to determine the proportional mix of two liquids flowing through the pipeline. For example, the sensor of the present invention could be used to determine the proportion of water and oil flowing through a pipeline since the viscosities of these two liquids are substantially different from one another. Another advantage of the sensor of the present invention is that it can be used solely to detect the presence or absence of flow in the pipeline 20. When there is no flow in c 13 the pipeline, the sensor plate 22 remains in its neutral position; however, when there is a flow in the pipeline, the sensor plate will move and generate a signal indicating that there is a flow of fluid through the pipeline.
The sensor of the present invention may also be used as a flow meter for homogeneous liquids. In this case, the sensor can be calibrated so that its output signal reflects the flow rate of the fluid through the pipeline. This is possible because the output signal i proportional to the velocity of the fluid flowing through the pipeline. of course in this case, one would have to provide a sensor to measure the temperature of the fluid in the pipeline since this parameter affects the calibration of the sensor plate 22.
While it is preferred to form the plate 22 from stainless steel, it is also possible to form. it from other materials. Specifically, in the case of oil with a high proportion of sand which is capable of causing an abrasion effect, it is possible to substitute a ceramic material for the stainless steel. The ceramic material utilized, of course, should be substantially abrasive resistant to the sand in the oil flow.
AS can be seen from the foregoing description, a sensor has been provided which can be used to monitor
S 1 - various parameters of a fluid flowing through a pipeline. The sensor has the advantage of being relatively simple in construction. It also has the advantage that should the sensor become defective, it can be easily replaced. In order to replace the sensor, one need only unscrew the housing from the pipeline and replace it with a different sensing element in another housing.
The sensor of the present invention further has the advantage that its sensitivity can be greatly increased by using a plate having a width selected specifically with the fluid passing through the pipeline in mind.
It is apparent that there has been provided in accordance with the present invention a sensor for detecting the presence of flow in oil production pipelines which fully satisfies the objects, means and advantages set forth hereinbefore. While the invention -c has been described in combination with specif embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art in light of the foregoing description. Accordingly, it is intended to embrace all such alternatives, modifications, and variations as fall within the spirit and broad scope of the appended claims.
157
Claims (16)
1. A sensor for detecting a parameter of a fluid flowing within a conduit, said sensor comprising: a movable sensing element located within said conduit and at least partially immersed within said fluid, means for detecting movement of said sensing element; and means for generating an electrical signal representative of said detected fluid parameter in response to said detected movement of said sensing element.
2. The sensor of claim 1 further comprising: said sensing element comprising a rod of non-magnetic material and a head member formed from a magnetic material secured to one end of said rod.
3. The sensor of claim 2 wherein said head member is formed from a ferromagnetic material.
4. The sensor of claim 2 wherein said head member is formed by a permanent magnet.
It,
5. The sensor of claim 2 wherein said rod is formed from stainless steel.
6. The sensor of claim 2 further comprising: a casing secured to said conduit; and said sensing element is fixed to a housing carried by said casing in a manner which allows for oscillation of said sensing element.
7. The sensor of claim 6 further comprising: said casing threadingly engaging a portion of said conduit.
8. The sensor of claim 2 wherein said detecting means comprises two spaced coils each having its own magnetic field, whereby movement of said sensing element causes a change in each said magnetic field.
9. The sensor of claim 8 wherein said coils are connected in a half bridge configuration and movement of said sensing element causes a variation in the inductance of the coils.
1 i 1
10. The sensor of claim 8 further comprising: a casing mounted to said conduit; said sensing element being supported within a housing secured to said casing; said coils being supported within said casing; and said sensing element and said coils being separated by a mechanical seal which prevents fluid within said conduit from contacting said coils.
11. The sensor of claim 8 further comprising: said generating means incLuding electronic circuit means for amplifying and treating the electrical signal produced by each said coil and for providing an output signal suitable for use with recording instrumentation.
12. The sensor of claim 11 wherein said fluid has two components and said signal generating means generates a signal representative of the proportion of a first component to a second component.
13. The sensor of claim 11 wherein said signal. generating means generates a signal representative of a presence of said fluid in said conduit.
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14. The sensor of claim 11 wherein said signal generating means generates a signal representative of a rate of flow of said fluid in said conduit.
15. A sensor for monitoring a flow of oil in a pipeline which comprises: a sensor secured to said pipeline at a desired location; said sensor having a casing secured to said pipeline; an elongated sensing element pivotably mounted within a housing secured to said casing; said sensing said housing and a attached thereto; and said sensing element having a desired thickness and a desired width and being oriented within said pipeline so that its width is substantially perpendicular to the direction of said oil flow.
element having a first end fixed to second end having a magnetic member
16. The sensor of claim 15 further comprising: means for generating two magnetic fields; and means for detecting changes in said magnetic fields due to displacement of said magnetic member on said sensing element and for providing an output signal representative of a parameter of said oil flow.
z
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US72548991A | 1991-07-03 | 1991-07-03 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9210407D0 GB9210407D0 (en) | 1992-07-01 |
| GB2257789A true GB2257789A (en) | 1993-01-20 |
Family
ID=24914774
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9210407A Withdrawn GB2257789A (en) | 1991-07-03 | 1992-05-15 | Oscillatory vane sensor for fluid flow |
Country Status (7)
| Country | Link |
|---|---|
| CA (1) | CA2068950A1 (en) |
| DE (1) | DE4220440A1 (en) |
| FR (1) | FR2678730A1 (en) |
| GB (1) | GB2257789A (en) |
| MX (1) | MX9202561A (en) |
| NL (1) | NL9201198A (en) |
| NO (1) | NO921888L (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005095996A1 (en) * | 2004-04-01 | 2005-10-13 | Wrc Plc | Flow detector |
| US8573065B2 (en) | 2010-06-23 | 2013-11-05 | Mahle International Gmbh | Fluid flow measuring device, valve device and measuring method |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19704499C2 (en) * | 1997-02-06 | 2000-10-05 | Rossendorf Forschzent | Device for measuring local flow velocities in gases and liquids |
| EP2230489B1 (en) * | 2009-03-21 | 2017-09-13 | Huba Control Ag | Pressure sensor for exhaust gas recirculation systems of combustion motors |
| CN114509368B (en) * | 2021-12-24 | 2024-06-11 | 安吉科广新材料科技有限公司 | Output detection device and method for optical cement coating |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1434165A (en) * | 1974-03-15 | 1976-05-05 | Tokyo Keiso Kk | Flow meter |
| GB1467574A (en) * | 1974-07-19 | 1977-03-16 | Siemens Ag | Measuring volumetric flow rate |
| EP0239703A1 (en) * | 1986-01-07 | 1987-10-07 | THORN EMI plc | Force-sensitive flow sensor |
| US4906807A (en) * | 1987-11-30 | 1990-03-06 | Dr. Siebert & Kuhn Gmbh & Co. Kg | Apparatus for monitoring the flow of fluid media in a pipeline |
| EP0377804A1 (en) * | 1988-12-09 | 1990-07-18 | ALFRED TEVES GmbH | Acceleration sensor with a one-sidedly clamped cantilever |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2752141A1 (en) * | 1977-11-22 | 1979-05-23 | Siemens Ag | Flowmeter with magnetic field sensitive resistor - has permanent magnet with non-magnetic cover plate, magnetising two field plates |
| US4286208A (en) * | 1980-01-07 | 1981-08-25 | Emhart Industries, Inc. | Fluid interface detector |
| DE3141879A1 (en) * | 1981-10-22 | 1983-05-05 | Battelle-Institut E.V., 6000 Frankfurt | Device for measuring flow velocities of fluid media |
| JPS58122431A (en) * | 1982-01-16 | 1983-07-21 | Sumitomo Metal Ind Ltd | Measuring method of flow rate of powder and granule |
| US4516432A (en) * | 1983-10-13 | 1985-05-14 | Nihon Kagaku Kogyo Co., Ltd. | Apparatus for measuring two-phase flow |
| US4596442A (en) * | 1983-12-19 | 1986-06-24 | Fiberdynamic, Inc. | Fiberoptic flow indicator system |
| US4774680B1 (en) * | 1986-09-19 | 1993-10-12 | Agar Corporation Ltd. | Method and apparatus for net oil measurement |
| DD257294A1 (en) * | 1987-01-21 | 1988-06-08 | Seefahrt Inghochschule | METHOD AND DEVICE FOR MEASURING THE FLOW OF DELIVERY IN PARTICULAR IN PIPES |
| DE8804848U1 (en) * | 1987-11-30 | 1988-06-23 | Dr. Siebert & Kühn GmbH & Co. KG, 3504 Kaufungen | Device for monitoring the flow of liquid or gaseous media |
-
1992
- 1992-05-13 NO NO92921888A patent/NO921888L/en unknown
- 1992-05-15 GB GB9210407A patent/GB2257789A/en not_active Withdrawn
- 1992-05-19 CA CA002068950A patent/CA2068950A1/en not_active Abandoned
- 1992-05-29 MX MX9202561A patent/MX9202561A/en unknown
- 1992-06-12 FR FR9207086A patent/FR2678730A1/en active Pending
- 1992-06-23 DE DE4220440A patent/DE4220440A1/en not_active Withdrawn
- 1992-07-03 NL NL9201198A patent/NL9201198A/en not_active Application Discontinuation
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1434165A (en) * | 1974-03-15 | 1976-05-05 | Tokyo Keiso Kk | Flow meter |
| GB1467574A (en) * | 1974-07-19 | 1977-03-16 | Siemens Ag | Measuring volumetric flow rate |
| EP0239703A1 (en) * | 1986-01-07 | 1987-10-07 | THORN EMI plc | Force-sensitive flow sensor |
| US4906807A (en) * | 1987-11-30 | 1990-03-06 | Dr. Siebert & Kuhn Gmbh & Co. Kg | Apparatus for monitoring the flow of fluid media in a pipeline |
| EP0377804A1 (en) * | 1988-12-09 | 1990-07-18 | ALFRED TEVES GmbH | Acceleration sensor with a one-sidedly clamped cantilever |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005095996A1 (en) * | 2004-04-01 | 2005-10-13 | Wrc Plc | Flow detector |
| US8573065B2 (en) | 2010-06-23 | 2013-11-05 | Mahle International Gmbh | Fluid flow measuring device, valve device and measuring method |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2678730A1 (en) | 1993-01-08 |
| GB9210407D0 (en) | 1992-07-01 |
| CA2068950A1 (en) | 1993-01-04 |
| NO921888L (en) | 1993-01-04 |
| MX9202561A (en) | 1993-01-01 |
| NO921888D0 (en) | 1992-05-13 |
| DE4220440A1 (en) | 1993-01-07 |
| NL9201198A (en) | 1993-02-01 |
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