EP1787092A1 - Dispositif thermique pour determiner et/ou controler le debit massique d'un fluide de mesure - Google Patents

Dispositif thermique pour determiner et/ou controler le debit massique d'un fluide de mesure

Info

Publication number
EP1787092A1
EP1787092A1 EP05761128A EP05761128A EP1787092A1 EP 1787092 A1 EP1787092 A1 EP 1787092A1 EP 05761128 A EP05761128 A EP 05761128A EP 05761128 A EP05761128 A EP 05761128A EP 1787092 A1 EP1787092 A1 EP 1787092A1
Authority
EP
European Patent Office
Prior art keywords
temperature sensor
temperature
measuring medium
flow
evaluation unit
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Withdrawn
Application number
EP05761128A
Other languages
German (de)
English (en)
Inventor
Dieter Schmidt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Endress and Hauser Wetzer GmbH and Co KG
Original Assignee
Endress and Hauser Wetzer GmbH and Co KG
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 Endress and Hauser Wetzer GmbH and Co KG filed Critical Endress and Hauser Wetzer GmbH and Co KG
Publication of EP1787092A1 publication Critical patent/EP1787092A1/fr
Withdrawn legal-status Critical Current

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
    • G01F1/68—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 thermal effects
    • G01F1/684—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow
    • G01F1/688—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow using a particular type of heating, cooling or sensing element
    • G01F1/69—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow using a particular type of heating, cooling or sensing element of resistive type
    • G01F1/692—Thin-film arrangements
    • 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
    • G01F1/68—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 thermal effects
    • G01F1/696—Circuits therefor, e.g. constant-current flow meters
    • G01F1/698—Feedback or rebalancing circuits, e.g. self heated constant temperature flowmeters

Definitions

  • the invention relates to a thermal or calorimetric device for determining and / or monitoring the flow of a flowing through a pipe or through a measuring tube measuring medium.
  • the measuring medium is a flowable medium, in particular a liquid, a vaporous or a gaseous medium.
  • thermal flow meters usually use two as possible identically designed temperature sensors.
  • both temperature sensors are usually installed in a measuring tube in which the flow of a measuring medium is measured.
  • One of the two temperature sensors is a so-called passive temperature sensor; it detects the current temperature of the medium to be measured.
  • the second temperature sensor is a so-called active temperature sensor, which is heated via a heating unit.
  • the heating unit is either an additional resistance heater or the temperature sensor itself is a resistance element, e.g. around a RTD (Resistance Temperature Detector) temperature sensor which is itself heated by conversion of an electrical power (e.g., by increased sense current).
  • RTD Resistance Temperature Detector
  • the two temperature sensors are pin-shaped or arranged straight and parallel to each other.
  • the measurement signal and consequently also the flow rate of the measurement medium measured in the pipeline or in the measurement tube changes as a function of the angle which the two temperature sensors occupy with respect to the flow direction of the measurement medium.
  • the heatable temperature sensor is heated so that sets a fixed temperature difference between the two tempera ture sensors.
  • it has become known to feed a constant-time heating power via a control / control unit.
  • the dissipation of the heat from the heated temperature sensor takes place via heat conduction, thermal radiation and possibly also free convection within the measuring medium. If the medium to be measured is in motion, an additional cooling of the heated temperature sensor is added by the colder medium flowing past. Due to the medium flowing past, an additional heat transfer occurs due to a forced flow Convection on. Consequently, in order to maintain the fixed temperature difference between the two temperature sensors, a higher heating power is required for the heated temperature sensor. In the case of the supply of a time-constant heating power, the temperature difference between the two temperature sensors decreases as a result of the flow of the measuring medium.
  • thermophysical properties of the measuring medium itself and the pressure prevailing in the measuring medium If the corresponding flow-dependent characteristic curves have been created for these parameters or if the corresponding parameters are known in the functional equations, the mass flow rate of the measuring medium can be determined exactly.
  • Thermal measuring instruments based on the principle described above are offered and sold by Endress + Hauser under the name 't-mass'.
  • the installation position of the flowmeter in the pipeline is always to be chosen so that it is ensured that the measuring medium with the temperature sensors in continuous thermal contact.
  • Possible installation positions are the lateral installation position in vertically arranged pipelines, or the temperature sensors are located in a horizontal pipeline in the upper, in the lower Bergich or in the lateral area of the pipeline. In the latter case, the positioning in the lateral area of the pipeline is advantageous insofar as in this type of installation neither deposits after air cushioning can adversely affect the function of the measuring device.
  • the two pin-shaped temperature sensors can be arranged one after another and the other side by side relative to the flow direction of the measuring medium ,
  • the object of the invention is to propose a calorimetric flowmeter whose measured value provision is essentially independent of the installation position in the measuring tube or in the pipe line.
  • a first temperature sensor and a second temperature sensor wherein the two temperature sensors are designed substantially rotationally symmetrical and in the region of a housing facing the measuring medium such that they in direct or indirect thermal contact with the through the pipe or through the measuring tube flowing medium.
  • the first temperature sensor provides information about the current temperature of the measuring medium; at least the second temperature sensor is a heatable temperature sensor to which a heating unit is assigned.
  • a control / evaluation unit is provided, which controls the heating unit in such a way that the heating unit supplies a defined heating power to the second temperature sensor.
  • the control / evaluation unit determines the flow of the measured medium through the pipe or through the measuring tube on the basis of the temperature difference and / or on the basis of the heating power supplied to the second temperature sensor.
  • the first temperature sensor and the second temperature sensor have the same
  • Shape of an open ring Furthermore, the two temperature sensors are arranged substantially concentrically.
  • the two temperature sensors at least in the an ⁇ bordering areas of the two rings have a serrated, toothed structure. This allows you to optimally increase the area of the temperature sensors, which is in thermal contact with the measuring medium.
  • the two temperature sensors are applied in thin-film technology to a dielectric disk-shaped structure.
  • a preferred embodiment of the device according to the invention provides that the two temperature sensors are arranged in mutually parallel planes. Between the two temperature sensors, an insulating layer is arranged.
  • control / evaluation unit controls the
  • Heating unit or the heatable temperature sensor so that the heating unit acts on the second temperature sensor with a constant heating power; Based on the temperature difference between the first temperature sensor and the second temperature sensor, the control / evaluation unit determines the flow of the measured medium in the pipeline or in the measuring tube.
  • control / evaluation unit controls the heating unit in such a way that between the first temperature sensor and the second temperature tursensor an approximately constant temperature difference prevails; Subsequently, the control / evaluation unit determines the flow of the measuring medium in the pipeline or in the measuring tube on the basis of the heating power supplied to the second temperature sensor.
  • control / evaluation unit either the
  • the device according to the invention is thus used as a flow switch.
  • control / evaluation unit is designed so that it measures the flow continuously, and / or that it recognizes in which time sequence or within which period of time the flow below or exceeds at least two predetermined limits.
  • control / evaluation unit is designed such that it can switch over the activation or evaluation of the two temperature sensors, whereby each temperature sensor is either a heatable temperature sensor or a temperature sensor for the current one Temperature of the measuring medium can be.
  • the measurement accuracy can be increased, for example, by averaging the values of the temperature sensors.
  • FIG. 1 a schematic representation of the device according to the invention
  • FIG. 2 a plan view of a first embodiment of the invention
  • FIG. 3 a plan view of a second embodiment of the invention
  • FIG. 4 a plan view of a third embodiment of the invention
  • FIG 5 shows a cross section through a fourth embodiment of the device according to the invention.
  • FIG. 1 shows a schematic representation of the flowmeter 1 according to the invention.
  • the flowmeter 1 is fastened by means of a screw thread 9 in a socket 4 which is located on the pipe 2.
  • a screw thread 9 in a socket 4 which is located on the pipe 2.
  • the flowing measuring medium 3 In the pipe 2 or in the measuring tube is the flowing measuring medium 3.
  • the flow direction is marked with S.
  • the temperature measuring device 6 is located in the measuring medium 3 zugewand Area of the Housing 5. Different embodiments of the substantially rotationally symmetrical and lying on concentric circles temperature sensors 11, 12 are shown in the figures Fig. 2-4.
  • the temperature sensors 11, 12 are in the cases shown on a dielectric
  • Carrier structure 13 is arranged, which is located on the end face of the housing 5. While the ring structures shown in FIGS. 2 and 3 are designed to be smooth in the adjacent regions of the two temperature sensors 11, 12, the two annular temperature sensors 11, 12 shown in FIG. 4 have a toothed shape.
  • the two temperature sensors 11, 12 can be electrically heatable resistance elements, so-called RTD sensors.
  • a conventional temperature sensor e.g. a PtIOO or PtIOOO to which a thermally coupled heating unit 14 is assigned.
  • the heating unit 14 is arranged in the housing 5 in FIG. 1.
  • the heating unit 14 is thermally coupled to the heatable temperature sensor 11, 12, but largely decoupled from the measuring medium.
  • the coupling or decoupling is preferably carried out via the filling of the corresponding intermediate spaces with a thermally highly conductive or a thermally poorly conductive material.
  • a casting material is preferably used for this purpose.
  • the flowmeter 1 according to the invention it is possible with the flowmeter 1 according to the invention to measure the flow either continuously; Alternatively, it is possible to use the flowmeter 1 according to the invention as a flow switch, which always indicates the change of a switching state, if at least one pre-specified limit is exceeded or exceeded.
  • both temperature sensors 11, 12 are made heatable, the desired function of the first temperature sensor 11 or the second temperature sensor 12 being determined by the control / evaluation unit 10.
  • the control / evaluation unit 10 it is possible for the control / evaluation unit 10 to actuate the two temperature sensors 11, 12 alternately as an active or passive temperature sensor 11, 12 and to determine the flow measured value via an averaging of the measured values supplied by the two temperature sensors 11, 12.
  • FIG. 4 shows a cross section of a fourth embodiment of the invention Device shown.
  • the two substantially rotationally symmetrical temperature sensors 11, 12 can be found in planes arranged essentially parallel to one another.
  • the two temperature sensors 11, 12 are applied to an insulating support structure 13, for example by thin-film technology.

Landscapes

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

Abstract

L'invention concerne un dispositif servant à déterminer et/ou contrôler le débit d'un fluide de mesure (3) à travers une conduite (2) ou un tube de mesure. Ce dispositif comprend un premier capteur de température (11) et un second capteur de température (12), ces deux capteurs de température (11, 12) présentant sensiblement une symétrie de révolution et étant disposés dans la zone d'un boîtier (5) orientée vers le fluide de mesure (3) de sorte qu'ils soient en contact thermique avec ledit fluide de mesure (3) s'écoulant dans la conduite (2) ou le tube de mesure. Tandis que le premier capteur de température (11) fournit des informations sur la température actuelle du fluide de mesure (3), le second capteur de température (12) peut être chauffé. Une unité de régulation/évaluation (10) fournit une puissance calorifique définie au second capteur de température (12) et détermine le débit du fluide de mesure (3) à travers la conduite (2) ou le tube de mesure à l'aide de la différence de température et/ou de la puissance calorifique fournie au second capteur de température (12).
EP05761128A 2004-08-20 2005-06-22 Dispositif thermique pour determiner et/ou controler le debit massique d'un fluide de mesure Withdrawn EP1787092A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102004040725 2004-08-20
DE102005015692A DE102005015692A1 (de) 2004-08-20 2005-04-05 Vorrichtung zur Bestimmung und/oder Überwachung des Massedurchflusses eines Messmediums
PCT/EP2005/052901 WO2006021467A1 (fr) 2004-08-20 2005-06-22 Dispositif thermique pour determiner et/ou controler le debit massique d'un fluide de mesure

Publications (1)

Publication Number Publication Date
EP1787092A1 true EP1787092A1 (fr) 2007-05-23

Family

ID=35355233

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05761128A Withdrawn EP1787092A1 (fr) 2004-08-20 2005-06-22 Dispositif thermique pour determiner et/ou controler le debit massique d'un fluide de mesure

Country Status (3)

Country Link
EP (1) EP1787092A1 (fr)
DE (1) DE102005015692A1 (fr)
WO (1) WO2006021467A1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005057687A1 (de) * 2005-12-01 2007-06-06 Endress + Hauser Flowtec Ag Vorrichtung zur Bestimmung und/oder Überwachung des Massedurchflusses eines fluiden Mediums
DE102006048448A1 (de) * 2006-10-11 2008-04-17 Endress + Hauser Wetzer Gmbh + Co. Kg Erzeugen einer Lotverbindung
DE102009047629A1 (de) * 2009-12-08 2011-06-09 Endress + Hauser Flowtec Ag Messaufnehmer zur Messung von zumindest einer thermischen Messgröße
EP2505970B1 (fr) 2011-03-31 2014-03-12 JUMO GmbH & Co. KG Capteur calorimétrique
DE102015112199A1 (de) 2015-07-27 2017-02-02 Endress + Hauser Wetzer Gmbh + Co. Kg Lötverfahren
DE102018109971A1 (de) * 2017-12-18 2019-08-14 Innovative Sensor Technology Ist Ag Thermischer Strömungssensor
DE102018129357A1 (de) * 2018-11-21 2020-05-28 Endress+Hauser SE+Co. KG Messsonde zur Bestimmung oder Überwachung einer physikalischen oder chemischen Prozessgröße eines Mediums
DE102024128145A1 (de) * 2024-09-27 2026-04-02 Endress+Hauser Wetzer Gmbh+Co. Kg Thermisches Durchflussmessgerät und Verfahren zum Betreiben eines solchen thermischen Durchflussmessgeräts
CN120007789B (zh) * 2025-02-21 2025-10-28 展旭德自控阀门有限公司 一种水阀手动执行器及执行器监控装置

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2468887A1 (fr) * 1979-11-06 1981-05-08 Renault Debimetre thermique pour fluide
US4829819A (en) * 1987-07-21 1989-05-16 Environmental Instruments, Inc. In-line dual element fluid flow probe
US4911008A (en) * 1988-10-03 1990-03-27 Allied-Signal Inc. Hot film anemometer
DE4205207A1 (de) * 1992-02-20 1993-08-26 Siemens Ag Vorrichtung zur messung einer gas- oder fluessigkeitsstroemung
US5392647A (en) * 1993-06-07 1995-02-28 Ricoh Seiki Company, Ltd. Flow sensor
DE4320326A1 (de) * 1993-06-18 1994-12-22 Siemens Ag Vorrichtung zur Messung einer radialen Gas- oder Flüssigkeitsströmung mit einer Wheatstone-Brücke von vier temperaturempfindlichen Widerständen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2006021467A1 *

Also Published As

Publication number Publication date
WO2006021467A1 (fr) 2006-03-02
DE102005015692A1 (de) 2006-02-23

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