WO1998036246A1 - Method and apparatus for measuring liquid flow - Google Patents

Method and apparatus for measuring liquid flow Download PDF

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Publication number
WO1998036246A1
WO1998036246A1 PCT/FI1998/000138 FI9800138W WO9836246A1 WO 1998036246 A1 WO1998036246 A1 WO 1998036246A1 FI 9800138 W FI9800138 W FI 9800138W WO 9836246 A1 WO9836246 A1 WO 9836246A1
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WO
WIPO (PCT)
Prior art keywords
flow
pressure difference
pressure
measuring
cutting valve
Prior art date
Application number
PCT/FI1998/000138
Other languages
French (fr)
Inventor
Juhani Aalto
Original Assignee
Softatalo Aida Oy
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
Priority claimed from FI980326A external-priority patent/FI980326A0/en
Application filed by Softatalo Aida Oy filed Critical Softatalo Aida Oy
Priority to DE29823785U priority Critical patent/DE29823785U1/en
Priority to AU59916/98A priority patent/AU5991698A/en
Publication of WO1998036246A1 publication Critical patent/WO1998036246A1/en
Priority to FI991708A priority patent/FI19991708A/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
    • G01F1/05—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
    • G01F1/34—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 measuring pressure or differential pressure
    • G01F1/36—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 measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
    • G01F1/40—Details of construction of the flow constriction devices
    • 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
    • G01F1/34—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 measuring pressure or differential pressure
    • G01F1/36—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 measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
    • G01F1/363—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 measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction with electrical or electro-mechanical indication

Definitions

  • the subject of this invention is the method described in the preamble of Claim 1 and the measuring apparatus described in the preamble of Claim 5.
  • the methods and apparatus which are the subject of this invention are used in measuring the cumulative flow or flow rate of liquids in pipelines.
  • This flow rate means the quantity of liquid flow per unit of time.
  • the methods and apparatus which are the subject of this invention are used for measuring water consumption or the amount of heat transfer liquid circulated from the district heating network of a consumer connected to the district heating system.
  • liquid flow has been measured, for example, with propeller wheel. Woltman. magnetic or measuring flange meters.
  • the consumer's district heating network flow volume has generally been measured with some method based on moving mechanical parts or magnetic fields. In these methods, the flow of liquid moves, for example, rotates a resistance part whose movement is transferred to the parts of the apparatus that calculate the cumulative flow.
  • the flow meter In the district heating network, the flow meter, according to the prior art, is generally located in the pipeline returning the heating liquid from the consumer.
  • measuring apparatus based on mechanical or magnetic functioning in the prior art is that their measuring accuracy has been rather poor. Measuring accuracy has also deteriorated with lapse of time as the meter has become stiffer with age. In the magnetic system, pollution in the pipeline affects the measured magnetic field and causes increasing inaccuracy in the measurements in the course of time.
  • the purpose of the invention is to remove the above mentioned technical deficiencies and produce a totally new type of method and measuring apparatus for measuring liquid flow.
  • the invention is based on a pressure cutting valve and a pressure difference transmitter which are installed in the pipe, and which measure the pressure difference across the pressure cutting valve.
  • the pressure difference measured by the pressure difference transmitter is fed to a microprocessor which determines the actual flow by comparing the pressure difference with that calibrated for the pressure cutting valve and stored in the microprocessor on a flow resistance curve for each position of the pressure cutting valve.
  • the features of the method of this invention are those which are described in the characterizing part of Claim 1, and the features of the measurement apparatus are those which are described in the characterizing part of Claim 5.
  • the invention makes it possible to create measuring apparatus and measurements which are dependable and stable in regard to time.
  • the flow rate of the liquid to be measured increases at the pressure cutting valve, and furthermore, the shear plane of the pressure cutting valve is sharp, so the measuring apparatus of this invention does not really become soiled in use.
  • the measuring apparatus is also relatively inexpensive and has a long life-span.
  • an additional benefit is that it is possible to centrally monitor from a control room the volume of flow used by the consumers. Thus it is possible to obtain information concerning the flow rate in the district heating pipeline at each moment and, for example, control the pumping stations on the basis of this information.
  • the application of the invention in its economic mode makes it easier to process the measuring results of the liquid flow by computer.
  • Figure 1 shows schematically one measuring apparatus according to the invention as applied to measuring the flow rate of water in tap water pipelines.
  • Figure 2 shows schematically another measuring apparatus according to the invention as applied to measuring the flow rate of district heating fluid.
  • the measuring apparatus is installed in feed pipe 8 coming from the tap water network 7.
  • the measuring apparatus consists of the following parts installed in the consumer feed pipe 8 of the tap water pipe: pressure cutting valve 1, pressure difference transmitter 2 located essentially close to the pressure cutting valve, with the first measuring point 3 in the consumer feed pipe 8 before the pressure cutting valve 1 and the second measuring point 4 after the pressure cutting valve 1 , and the microprocessor 5 connected electrically to the pressure difference transmitter 2.
  • the Figure also shows the microcomputer 6 which is connected to the microprocessor 5.
  • the operation of the measuring apparatus in Figure 1 and the corresponding measuring method is based on the fact that as the water flows in the consumer feed pipe 8 of the tap water pipe, the water has to flow through the pressure cutting valve 1.
  • the flow going through the pressure cutting valve 1 causes a pressure difference in the flowing fluid across the pressure cutting valve 1.
  • This pressure difference is measured in the first and second measuring points 3, 4 with the aid of the pressure difference transmitter.
  • the measurement value obtained from the pressure difference transmitter is transmitted to the microprocessor 5, which converts the measurement value into a pressure difference and compares it with a calibration table programmed in advance in order to determine the flow rate corresponding to the pressure difference.
  • This table has been defined for the type of pressure cutting valve concerned, and the position of the valve, with the aid of calibration measurements.
  • the table consists of the corresponding values of 20 pressure differences and flow rates.
  • correction coefficients may be used in determining the flow rate.
  • the accumulated flow of water may be measured by integrating the flow rate with regard to time.
  • the required measuring accuracy has been ⁇ 1 %, and for this reason it has been decided to use pressure difference transmitter 2, which has a measuring accuracy of under ⁇ 0,2 %, optimally, and preferably under ⁇ 0,1 %.
  • the microprocessor 5 is a MT 8b processor, and the counters of the apparatus are 20 E 2 PROM units. Such memory units are able to sustain approximately 100,000 writing operations which, at half-hourly updates, corresponds to a life-span of 114 years.
  • the measuring apparatus can be calibrated and the comparison table determined, for example, by discharging water at a constant rate through the pressure cutting valve 1 into a measuring container. Measurements are made of the pressure difference, the duration of flow and the volume of fluid passing through valve 1. The volume of fluid may be determined either by volume measurements or by weighing. A sufficient number of tests are performed at various pressure differences at different positions of the pressure cutting valve, and the comparison table is drawn up from this information.
  • the measuring apparatus shown in Figure 2 corresponds to the measuring apparatus in Figure 1, but it is installed for measuring the flow of district heating fluid.
  • the Figure shows the supply tube 9 of the district heating network, from which comes the consumer's feed pipe 10, the return tube 11 of the district heating network and the consumer's return pipe 12 as well as the heat transmission system 13 to which heat energy is fed from the district heating network.
  • the pressure cutting valve 1 is installed in the consumer's return pipe 12. This is because the pressure cutting valve has to be located in the consumer pipe 10 at location 12 where there is as little turbulence as possible in the flow of the fluid. Turbulence causes local dynamic and static pressure changes in the flow, which are seen as disturbances in the measurements.
  • the coarse-control valve for regulating flow which, according to prior art solutions, is the only control valve.
  • This coarse-control valve is generally located in the consumer's feed pipe 10, so when the pressure cutting valve 1 is installed in the return pipe 12, the flow has time to settle as it goes through the heat transmission system.
  • the invention improves the operating efficiency of the district heating system and lowers energy costs.
  • the pressure cutting valve 1 effectively equalizes the flow of heat transmission fluid as the coarse-control valve opens and closes. Therefore the pressure cutting valve 1 cuts the flow peaks caused by the coarse action of the coarse-control valve, which lead to poor energy operating efficiency and momentarily excessive heat feed.
  • the improved measurement accuracy and possibility to process flow information in real time on a computer makes possible advanced planning of energy consumption and thereby savings.
  • the measurement and calculation of heat energy consumption may, if desired, be linked as a part of the system by installing heat sensors in the consumer's feed pipe 10 and in the return pipe 12 and connecting these to the microprocessor 5 as a part of the measuring system.
  • the pressure cutting valve 1 is in most of the embodiments of the invention of such a suitable type that the flow resistance curve in the range of use is as linear as practicable.
  • the flow through the pressure cutting valve 1 and the pressure difference to be measured across it are dependent on each other in linear form, which facilitates accurate interpolation of measurement values with the aid of even a relatively small number of comparison points.
  • the resistance curve of even a good pressure cutting valve would naturally behave in a non-linear manner at flow rates which are greater or smaller than those in the planned range of use.
  • the flow resistance of the pressure cutting valve 1 grows sharply as the rate of flow begins to rise above the planned range of use. This feature further enhances the ability of the apparatus of this invention to cut the excessive flow pulses of the district heating network.
  • the invention may also be applied to a district heating network in such a way that the position of the part that restricts the flow through the pressure cutting valve 1 is adjusted, and thus the flow resistance is modified during the measuring process.
  • the pressure cutting valve 1 may be a part of the active flow control mechanism.
  • determination of the flow is done by comparing the measured pressure difference with the position of the pressure cutting valve 1 with the corresponding flow resistance curve.

Landscapes

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

Abstract

The invention concerns a method and apparatus for measuring liquid flow in a pipe (8). According to the invention, the measurement is made by causing the liquid flow to be measured to go through a pressure cutting valve (1), the pressure difference of the liquid flow is measured across the pressure cutting valve (1) and the flow corresponding to the pressure difference is determined by comparing the pressure difference with a dependence that has been determined in advance between the pressure difference and the flow in corresponding measuring circumstances. The measuring apparatus according to this invention comprises a pressure cutting valve (1) installed as part of the pipeline (8) in the direction of flow, and the pressure measurement points (3, 4) installed both before and after the pressure cutting valve (1), a pressure difference transmitter (2) for measuring the pressure difference between the pressure difference points (3, 4), and means (5) for converting the pressure difference into the desired measurement data.

Description

Method and apparatus for measuring liquid flow
The subject of this invention is the method described in the preamble of Claim 1 and the measuring apparatus described in the preamble of Claim 5.
The methods and apparatus which are the subject of this invention are used in measuring the cumulative flow or flow rate of liquids in pipelines. This flow rate means the quantity of liquid flow per unit of time. Particularly the methods and apparatus which are the subject of this invention are used for measuring water consumption or the amount of heat transfer liquid circulated from the district heating network of a consumer connected to the district heating system.
According to the prior art, liquid flow has been measured, for example, with propeller wheel. Woltman. magnetic or measuring flange meters. The consumer's district heating network flow volume has generally been measured with some method based on moving mechanical parts or magnetic fields. In these methods, the flow of liquid moves, for example, rotates a resistance part whose movement is transferred to the parts of the apparatus that calculate the cumulative flow. In the magnetic method, observations are made in the changes of the magnetic field caused by the flow of liquid. In the district heating network, the flow meter, according to the prior art, is generally located in the pipeline returning the heating liquid from the consumer.
The deficiency of measuring apparatus based on mechanical or magnetic functioning in the prior art is that their measuring accuracy has been rather poor. Measuring accuracy has also deteriorated with lapse of time as the meter has become stiffer with age. In the magnetic system, pollution in the pipeline affects the measured magnetic field and causes increasing inaccuracy in the measurements in the course of time.
The purpose of the invention is to remove the above mentioned technical deficiencies and produce a totally new type of method and measuring apparatus for measuring liquid flow. The invention is based on a pressure cutting valve and a pressure difference transmitter which are installed in the pipe, and which measure the pressure difference across the pressure cutting valve. The pressure difference measured by the pressure difference transmitter is fed to a microprocessor which determines the actual flow by comparing the pressure difference with that calibrated for the pressure cutting valve and stored in the microprocessor on a flow resistance curve for each position of the pressure cutting valve.
More precisely, the features of the method of this invention are those which are described in the characterizing part of Claim 1, and the features of the measurement apparatus are those which are described in the characterizing part of Claim 5.
Considerable benefits are obtained with the aid of this invention.
Since the construction of the pressure cutting valve is simple and no moving parts are required in the measurement system, the invention makes it possible to create measuring apparatus and measurements which are dependable and stable in regard to time. The flow rate of the liquid to be measured increases at the pressure cutting valve, and furthermore, the shear plane of the pressure cutting valve is sharp, so the measuring apparatus of this invention does not really become soiled in use. The measuring apparatus is also relatively inexpensive and has a long life-span.
When the measuring method is applied in a preferable way for measuring the flow of a district heating system, an additional benefit is that it is possible to centrally monitor from a control room the volume of flow used by the consumers. Thus it is possible to obtain information concerning the flow rate in the district heating pipeline at each moment and, for example, control the pumping stations on the basis of this information. On the whole, the application of the invention in its economic mode makes it easier to process the measuring results of the liquid flow by computer.
The invention will be examined with the aid of exemplifying embodiments and with reference to the enclosed drawings as follows.
Figure 1 shows schematically one measuring apparatus according to the invention as applied to measuring the flow rate of water in tap water pipelines.
Figure 2 shows schematically another measuring apparatus according to the invention as applied to measuring the flow rate of district heating fluid.
In Figure 1 the measuring apparatus is installed in feed pipe 8 coming from the tap water network 7. The measuring apparatus consists of the following parts installed in the consumer feed pipe 8 of the tap water pipe: pressure cutting valve 1, pressure difference transmitter 2 located essentially close to the pressure cutting valve, with the first measuring point 3 in the consumer feed pipe 8 before the pressure cutting valve 1 and the second measuring point 4 after the pressure cutting valve 1 , and the microprocessor 5 connected electrically to the pressure difference transmitter 2. The Figure also shows the microcomputer 6 which is connected to the microprocessor 5.
The operation of the measuring apparatus in Figure 1 and the corresponding measuring method is based on the fact that as the water flows in the consumer feed pipe 8 of the tap water pipe, the water has to flow through the pressure cutting valve 1. The flow going through the pressure cutting valve 1 causes a pressure difference in the flowing fluid across the pressure cutting valve 1. This pressure difference is measured in the first and second measuring points 3, 4 with the aid of the pressure difference transmitter. The measurement value obtained from the pressure difference transmitter is transmitted to the microprocessor 5, which converts the measurement value into a pressure difference and compares it with a calibration table programmed in advance in order to determine the flow rate corresponding to the pressure difference. This table has been defined for the type of pressure cutting valve concerned, and the position of the valve, with the aid of calibration measurements. In the example, the table consists of the corresponding values of 20 pressure differences and flow rates. In addition to the table, correction coefficients may be used in determining the flow rate. The accumulated flow of water may be measured by integrating the flow rate with regard to time.
In this example, the required measuring accuracy has been ±1 %, and for this reason it has been decided to use pressure difference transmitter 2, which has a measuring accuracy of under ±0,2 %, optimally, and preferably under ±0,1 %. In the example, the microprocessor 5 is a MT 8b processor, and the counters of the apparatus are 20 E2PROM units. Such memory units are able to sustain approximately 100,000 writing operations which, at half-hourly updates, corresponds to a life-span of 114 years.
The measuring apparatus can be calibrated and the comparison table determined, for example, by discharging water at a constant rate through the pressure cutting valve 1 into a measuring container. Measurements are made of the pressure difference, the duration of flow and the volume of fluid passing through valve 1. The volume of fluid may be determined either by volume measurements or by weighing. A sufficient number of tests are performed at various pressure differences at different positions of the pressure cutting valve, and the comparison table is drawn up from this information.
The measuring apparatus shown in Figure 2 corresponds to the measuring apparatus in Figure 1, but it is installed for measuring the flow of district heating fluid. The Figure shows the supply tube 9 of the district heating network, from which comes the consumer's feed pipe 10, the return tube 11 of the district heating network and the consumer's return pipe 12 as well as the heat transmission system 13 to which heat energy is fed from the district heating network. The pressure cutting valve 1 is installed in the consumer's return pipe 12. This is because the pressure cutting valve has to be located in the consumer pipe 10 at location 12 where there is as little turbulence as possible in the flow of the fluid. Turbulence causes local dynamic and static pressure changes in the flow, which are seen as disturbances in the measurements. One of the worst causes of turbulence is the coarse-control valve for regulating flow which, according to prior art solutions, is the only control valve. This coarse-control valve is generally located in the consumer's feed pipe 10, so when the pressure cutting valve 1 is installed in the return pipe 12, the flow has time to settle as it goes through the heat transmission system.
Used in this way, the invention improves the operating efficiency of the district heating system and lowers energy costs. This is because the pressure cutting valve 1 effectively equalizes the flow of heat transmission fluid as the coarse-control valve opens and closes. Therefore the pressure cutting valve 1 cuts the flow peaks caused by the coarse action of the coarse-control valve, which lead to poor energy operating efficiency and momentarily excessive heat feed. In addition, the improved measurement accuracy and possibility to process flow information in real time on a computer makes possible advanced planning of energy consumption and thereby savings. The measurement and calculation of heat energy consumption may, if desired, be linked as a part of the system by installing heat sensors in the consumer's feed pipe 10 and in the return pipe 12 and connecting these to the microprocessor 5 as a part of the measuring system.
The pressure cutting valve 1 is in most of the embodiments of the invention of such a suitable type that the flow resistance curve in the range of use is as linear as practicable. Thus the flow through the pressure cutting valve 1 and the pressure difference to be measured across it are dependent on each other in linear form, which facilitates accurate interpolation of measurement values with the aid of even a relatively small number of comparison points. The resistance curve of even a good pressure cutting valve would naturally behave in a non-linear manner at flow rates which are greater or smaller than those in the planned range of use. In the invention's preferable district heating application, the flow resistance of the pressure cutting valve 1 grows sharply as the rate of flow begins to rise above the planned range of use. This feature further enhances the ability of the apparatus of this invention to cut the excessive flow pulses of the district heating network.
The invention may also be applied to a district heating network in such a way that the position of the part that restricts the flow through the pressure cutting valve 1 is adjusted, and thus the flow resistance is modified during the measuring process. In this way the pressure cutting valve 1 may be a part of the active flow control mechanism. In this case, determination of the flow is done by comparing the measured pressure difference with the position of the pressure cutting valve 1 with the corresponding flow resistance curve.
The examples presented above can also be applied when constructing extensive systems, for example, for district heating services. Accurate and real-time computer aided measurements make it possible to develop advanced leak observation and alarm systems, and energy saving pumping arrangements for these systems.

Claims

Patent Claims:
1. Method for measuring liquid flow in pipes (8, 12), characterized in that
- the liquid flow to be measured is allowed to go through a pressure cutting valve (1),
- the pressure difference of the flowing liquid across the pressure cutting valve (1) is measured and
- the flow corresponding to the pressure difference is determined by comparing the pressure difference with a dependence that has been determined in advance between the pressure difference and flow in corresponding measuring circumstances.
2. The method according to Claim 1, characterized in that the liquid flow to be measured is the flow in the pipe (10, 12) between the district heating network (9. 1 1) and the consumer (Figure 2).
3. The method according to Claim 1, characterized in that the liquid flow to be measured is the flow in the pipe (8) from the tap water network (7) to the consumer (Figure 1).
4. The method according to Claim 1, characterized in that a microprocessor (5) is used for making the comparison when determining the flow corresponding to the pressure difference.
5. An apparatus for measuring the liquid flow in a pipe (8, 12), characterized in that it comprises
- a pressure cutting valve (1) installed as a part of the pipeline (8, 12), - pressure measurement points (3, 4) located both before and after the pressure cutting valve (1) in the pipeline (8, 12),
- a pressure difference transmitter (2) for measuring the pressure difference between the pressure measurement points (3, 4),
- means (5) for converting the pressure difference to the desired measurement data.
6. The apparatus according to Claim 5, characterized in that the means (5) for converting the pressure difference to the desired measurement data comprise a microprocessor.
PCT/FI1998/000138 1997-02-13 1998-02-13 Method and apparatus for measuring liquid flow WO1998036246A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE29823785U DE29823785U1 (en) 1998-02-13 1998-02-13 Device for measuring a liquid flow
AU59916/98A AU5991698A (en) 1997-02-13 1998-02-13 Method and apparatus for measuring liquid flow
FI991708A FI19991708A (en) 1998-02-12 1999-08-11 Method and apparatus for measuring fluid flow

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI980326 1997-02-13
FI980326A FI980326A0 (en) 1996-01-19 1998-02-12 Maet-, reglerings- och beraekningsfoerfarande

Publications (1)

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WO1998036246A1 true WO1998036246A1 (en) 1998-08-20

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PCT/FI1998/000138 WO1998036246A1 (en) 1997-02-13 1998-02-13 Method and apparatus for measuring liquid flow

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WO (1) WO1998036246A1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3713542A1 (en) * 1986-04-25 1987-10-29 Tokyo Keiki Kk Flow velocity measuring device
EP0461057A1 (en) * 1990-06-06 1991-12-11 Comap Process for measuring the rate of flow and apparatus for flow regulation purposes of a thermal regulation fluid in a conduit
DE4025323A1 (en) * 1990-08-10 1992-02-13 Oventrop Sohn Kg F W Throughflow measurer for radiators of central heating system - has electronic computer receiving measurement values from length and pressure differential measuring units
EP0565485A1 (en) * 1992-04-08 1993-10-13 EMILE EGGER & CO. AG Method and device to measure the flow of a medium and application of the method
WO1996000883A1 (en) * 1994-06-30 1996-01-11 Deltec Fuel Systems B.V. Gas pressure regulator with integrated flow rate measurement

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3713542A1 (en) * 1986-04-25 1987-10-29 Tokyo Keiki Kk Flow velocity measuring device
EP0461057A1 (en) * 1990-06-06 1991-12-11 Comap Process for measuring the rate of flow and apparatus for flow regulation purposes of a thermal regulation fluid in a conduit
DE4025323A1 (en) * 1990-08-10 1992-02-13 Oventrop Sohn Kg F W Throughflow measurer for radiators of central heating system - has electronic computer receiving measurement values from length and pressure differential measuring units
EP0565485A1 (en) * 1992-04-08 1993-10-13 EMILE EGGER & CO. AG Method and device to measure the flow of a medium and application of the method
WO1996000883A1 (en) * 1994-06-30 1996-01-11 Deltec Fuel Systems B.V. Gas pressure regulator with integrated flow rate measurement

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Vol. 13, No. 314, (P-899); & JP,A,01 084 118 (YAMATAKE HONEYWELL CO LTD) 29 March 1989. *
PATENT ABSTRACTS OF JAPAN, Vol. 8, No. 208, (P-302); & JP,A,59 092 313 (KANSAI DENRIYOKU K.K.) 28 May 1984. *

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