DE19610885A1 - Heat transmission measuring unit with measurement head acted on by fluid to be measured - Google Patents
Heat transmission measuring unit with measurement head acted on by fluid to be measuredInfo
- Publication number
- DE19610885A1 DE19610885A1 DE1996110885 DE19610885A DE19610885A1 DE 19610885 A1 DE19610885 A1 DE 19610885A1 DE 1996110885 DE1996110885 DE 1996110885 DE 19610885 A DE19610885 A DE 19610885A DE 19610885 A1 DE19610885 A1 DE 19610885A1
- Authority
- DE
- Germany
- Prior art keywords
- heat transfer
- disc
- thin
- sensor
- measuring device
- 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.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/24—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid
- G01F23/246—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid thermal devices
- G01F23/247—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid thermal devices for discrete levels
- G01F23/248—Constructional details; Mounting of probes
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/18—Investigating or analyzing materials by the use of thermal means by investigating thermal conductivity
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Analytical Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Thermal Sciences (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Abstract
Description
Die Erfindung betrifft ein Wärmeübergangsmeßgerät mit einem von einem strömenden Meßfluid beaufschlagbaren Meßkopf, der einen über eine wärmeleitende Trennwand druckdicht gegenüber dem Meßfluid abgedichteten Innenraum und einen im Innenraum angeordneten, in thermischem Kontakt mit der Trennwand ste henden, mindestens ein Heizelement und ein Temperaturmeß element enthaltenden kalorimetrischen Sensor aufweist. Die Erfindung betrifft ferner ein Verfahren zur Herstellung ei nes solchen Wärmeübergangsmeßgeräts.The invention relates to a heat transfer measuring device with a by a flowing measuring fluid acted upon measuring head, the one against a pressure-tight via a heat-conducting partition the measuring fluid sealed interior and an interior arranged, in thermal contact with the partition ste henden, at least one heating element and a temperature measurement element containing calorimetric sensor. The The invention further relates to a method for producing egg nes such heat transfer meter.
Wärmeübergangsmeßgeräte dieser Art werden vor allem als Strömungswächter zur elektrischen Erfassung von Wärmever lusten in strömenden Medien, als Füllstandssonden oder als Phasendetektoren zur Überwachung des Wechsels von Dampf- und Flüssigkeitszuständen eingesetzt. Sie arbeiten nach dem ka lorimetrischen Prinzip, bei welchem Temperaturänderungen aufgrund eines definierten Wärmeeintrags bestimmt und com putergestützt ausgewertet werden. Bei bekannten Wärmeüber gangsmeßgeräten läßt vor allem die Herstellung des Meßkopfes mit einer reproduzierbar ansprechenden wärmeübertragenden Trennwand zu wünschen übrig.Heat transfer meters of this type are mainly used as Flow monitor for electrical detection of heat ver lusts in flowing media, as level probes or as Phase detectors for monitoring the change of steam and Fluid states used. They work after the ka lorimetric principle at which temperature changes determined based on a defined heat input and com be computer-aided. With known heat transfer gangsmeßgeräte lets especially the manufacture of the measuring head with a reproducibly appealing heat transfer Partition left a lot to be desired.
Ausgehend hiervon liegt der Erfindung die Aufgabe zugrunde, ein Wärmeübergangsmeßgerät sowie ein Verfahren zu dessen Herstellung zu entwickeln, dessen Meßkopf einfach herstell bar ist und besonders gute und reproduzierbare Wärmeüber tragungseigenschaften aufweist. Proceeding from this, the invention is based on the object a heat transfer meter and a method for the same To develop manufacturing whose measuring head is easy to manufacture bar and is particularly good and reproducible heat transfer has wearing properties.
Zur Lösung dieser Aufgabe werden die in den Ansprüchen 1 und 11 angegebenen Merkmalskombinationen vorgeschlagen. Vorteil hafte Ausgestaltungen und Weiterbildungen der Erfindung er geben sich aus den Unteransprüchen.To solve this problem, the in claims 1 and 11 combinations of features proposed. Advantage sticky refinements and developments of the invention give themselves from the subclaims.
Der erfindungsgemäßen Lösung liegt der Gedanke zugrunde, daß die Trennwand als vorgefertigte dünnwandige Scheibe mit de finierter Wandstärke ausgebildet ist, deren Außenrand umlau fend mit einem Öffnungsrand eines am Meßkopf angeordneten Rohransatzes materialschlüssig verbunden ist. Die dünnwandi ge Scheibe kann dabei am Rohransatz beispielsweise durch La serschweißen angeschweißt oder angelötet werden. Sie besteht zweckmäßig aus Metall, vorzugsweise aus dem gleichen Edel stahl wie das Rohrstück des Meßkopfs.The solution according to the invention is based on the idea that the partition as a prefabricated thin-walled disc with de Finished wall thickness is formed, the outer edge umlau fend with an opening edge arranged on the measuring head Pipe approach is materially connected. The thin walled ge disc can be on the pipe neck, for example by La welding are welded or soldered on. she consists expediently made of metal, preferably of the same noble steel like the pipe section of the measuring head.
Die dünnwandige Scheibe, die zweckmäßig eine Wandstärke von 0,3 bis 0,5 mm aufweist, kann hinsichtlich ihrer Wandstärke sehr genau dimensioniert werden, so daß man bei der Herstel lung der Wärmeübergangsmeßgeräte reproduzierbare Wärmeüber gangseigenschaften erhält. Dies gilt umso mehr, als auch die Anbringung des kalorimetrischen Sensors an der vorgefertig ten Scheibe leichter möglich ist als im Inneren eines Meß kopfes. Dementsprechend ist es von Vorteil, wenn die vorge fertigte dünnwandige Scheibe zunächst mit dem kalorimetri schen Sensor wärmeleitend verbunden wird und erst anschlie ßend die auf diese Weise konfektionierte Scheibe unter Bil dung der Trennwand auf den freien Öffnungsrand des Rohran satzes mit nach dem Inneren des Meßkopfes weisendem Sensor druckdicht angeschweißt wird. The thin-walled disc, which is expediently a wall thickness of Has 0.3 to 0.5 mm, with regard to their wall thickness be dimensioned very precisely, so that you can manufacture development of the heat transfer measuring devices reproducible heat transfer maintains gait characteristics. This is even more true than that Attach the calorimetric sensor to the prefabricated ten disk is easier than inside a measurement head. Accordingly, it is advantageous if the pre first produced thin-walled panes using the kalorimetri sensor is connected in a heat-conducting manner and only then ß the pane so assembled under Bil the partition on the free opening edge of the pipe set with the sensor pointing towards the inside of the measuring head is welded pressure-tight.
Der kalorimetrische Sensor kann dabei beispielsweise in Dickschichttechnik oder Dünnfilmtechnik vorgefertigt und auf die Scheibe wärmeleitend aufgeklebt werden. Grundsätzlich ist es jedoch auch möglich, den Sensor in Dünnfilmtechnik unmittelbar auf die metallische Scheibe aufzubringen.The calorimetric sensor can, for example, in Thick film technology or thin film technology prefabricated and on the pane can be glued on in a heat-conducting manner. Basically However, it is also possible to use thin-film technology for the sensor to be applied directly to the metallic disc.
Der Sensor weist zweckmäßig einen Keramikträger mit zwei im Abstand voneinander und von dem Temperaturmeßelement ange ordneten Widerstandsheizelementen auf. Als Temperaturmeßele ment kann ein temperaturabhängiger Widerstand (NTC oder PTC) verwendet werden, der an eine externe Meßbrücke angeschlos sen werden kann.The sensor expediently has a ceramic carrier with two im Distance from each other and from the temperature measuring element arranged resistance heating elements. As a temperature gauge a temperature-dependent resistor (NTC or PTC) be used, which is connected to an external measuring bridge can be sen.
Eine vorteilhafte Ausgestaltung der Erfindung sieht vor, daß der Meßkopf ein den Rohransatz tragendes, mit einem Außenge winde versehenes rotationssymmetrisches Gehäuseteil auf weist, das in eine Gewindebohrung eines flüssigkeitsdurch strömten Rohres druckdicht eingeschraubt werden kann. Im In nenraum des Gehäuseteils kann im Abstand von der Trennwand ein Anschlußstück angeordnet werden, das mit dem Heizelement und dem Temperaturmeßelement des Sensors galvanisch verbun den ist und an dem ein nach außen geführtes Anschlußkabel angeschlossen ist.An advantageous embodiment of the invention provides that the measuring head is carrying the pipe socket, with an outer rim winch provided rotationally symmetrical housing part points that in a threaded bore of a liquid flowed pipe can be screwed in pressure-tight. In the inner space of the housing part can be at a distance from the partition a connector can be arranged with the heating element and galvanically connected the temperature measuring element of the sensor which is and on which an outside lead lead connected.
Im folgenden wird die Erfindung anhand eines in der Zeich nung in schematischer Weise dargestellten Ausführungsbei spiels näher erläutert. Die einzige Figur zeigt einen Längs schnitt durch ein Wärmeübergangsmeßgerät.In the following the invention based on one in the drawing tion shown in a schematic manner explained in more detail. The only figure shows a longitudinal cut through a heat transfer meter.
Das in der Zeichnung dargestellte Wärmeübergangsmeßgerät ist als Strömungswächter zur elektrischen Erfassung von Wärme verlusten in strömenden Medien, als Füllstandssonde oder als Phasendetektor zur Wasserdampferkennung bestimmt. Es besteht aus einem Meßkopf 10 mit einem rotationssymmetrischen Gehäu seteil 12 und einem stirnseitig über das Gehäuseteil 12 über stehenden Rohransatz 14, einer den Rohransatz 14 stirnseitig verschließenden dünnwandigen Trennwand 16 und einem auf der Innenseite der Trennwand 16 in wärmeleitender Verbindung mit dieser angeordneten kalorimetrischen Sensor 18. Die Trenn wand 16 ist als vorgefertigte dünnwandige Metallscheibe mit einer definierten Wandstärke von etwa 0,4 mm ausgebildet, die mit dem Sensor 18 bestückt wird, bevor sie an den Öff nungsrand 20 des Rohransatzes 14 angeschweißt wird. Der Sen sor 18 umfaßt einen Keramikträger 22, mindestens ein auf dem Keramikträger angeordnetes Widerstands-Heizelement 24 und ein Temperaturmeßelement 26. Das Heizelement 24 und das Tem peraturmeßelement 26 sind über die Drähte 28 mit einem im Innenraum 30 des Gehäuseteils 12 angeordneten Anschlußstück 32 verbunden, an welchem seinerseits ein nach außen geführ tes Kabel 34 angeschlossen ist. Der Meßkopf 10 weist im Be reich seines Gehäuseteils 12 ein Außengewinde 36 auf, mit dem es in eine entsprechende Gewindebohrung eines mit dem Meßfluid in Richtung des Pfeils 38 durchströmten Rohres 40 flüssigkeitsdicht einsetzbar ist. Der Meßkopf 10 ist über das Kabel 34 an ein externes Steuer- und Auswertegerät 42 anschließbar.The heat transfer measuring device shown in the drawing is intended as a flow monitor for the electrical detection of heat losses in flowing media, as a level probe or as a phase detector for water vapor detection. It consists of a measuring head 10 with a rotationally symmetrical housing seteil 12 and a front end over the housing part 12 via a standing pipe socket 14 , a thin-walled partition wall 16 closing the pipe socket 14 on the end side and a calorimetric sensor 18 arranged on the inside of the partition wall 16 in a thermally conductive connection therewith . The partition wall 16 is formed as a prefabricated thin-walled metal disc with a defined wall thickness of about 0.4 mm, which is equipped with the sensor 18 before it is welded to the opening edge 20 of the tubular extension 14 . The sensor 18 comprises a ceramic carrier 22 , at least one resistance heating element 24 arranged on the ceramic carrier and a temperature measuring element 26 . The heating element 24 and the tem perature measuring element 26 are connected via the wires 28 to a connector 32 arranged in the interior 30 of the housing part 12 , to which in turn an outwardly guided cable 34 is connected. The measuring head 10 has in the area of its housing part 12 has an external thread 36 with which it can be used in a corresponding threaded bore of a tube 40 through which the measuring fluid flows in the direction of the arrow 38 . The measuring head 10 can be connected to an external control and evaluation device 42 via the cable 34 .
Claims (14)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1996110885 DE19610885B4 (en) | 1996-03-20 | 1996-03-20 | A heat transfer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1996110885 DE19610885B4 (en) | 1996-03-20 | 1996-03-20 | A heat transfer |
Publications (2)
Publication Number | Publication Date |
---|---|
DE19610885A1 true DE19610885A1 (en) | 1997-09-25 |
DE19610885B4 DE19610885B4 (en) | 2005-07-07 |
Family
ID=7788813
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE1996110885 Expired - Lifetime DE19610885B4 (en) | 1996-03-20 | 1996-03-20 | A heat transfer |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE19610885B4 (en) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1111377A1 (en) * | 1999-12-23 | 2001-06-27 | Fraunhofer-Gesellschaft Zur Förderung Der Angewandten Forschung E.V. | Method and device for determining the concentration of substances in a volume of liquid |
WO2003017741A1 (en) * | 2001-08-04 | 2003-02-27 | Robert Bosch Gmbh | Device consisting at least of two parts joined together |
DE10154561B4 (en) * | 2000-11-22 | 2004-07-08 | Visteon Global Technologies, Inc., Dearborn | Mass air flow sensor bypass housing |
DE102004040110A1 (en) * | 2004-08-18 | 2006-02-23 | Endress + Hauser Wetzer Gmbh + Co Kg | Method and device for determining and / or monitoring the mass flow |
EP1705463A1 (en) * | 2005-03-23 | 2006-09-27 | Federico Lanzani | Sensing device for measuring a fluid flow and a liquid level |
DE102004055101B4 (en) * | 2004-08-10 | 2010-11-11 | I F M Electronic Gmbh | Assembly of a flow sensor, a passage and a channel disposed within the passage channel measuring channel |
DE102013204470A1 (en) | 2013-03-14 | 2014-09-18 | Ferdinand Wind | Heat transfer meter |
EP2522972A3 (en) * | 2011-05-09 | 2015-02-25 | Azbil Corporation | Calorific value measuring system and calorific value measuring method |
US11280651B2 (en) * | 2019-03-25 | 2022-03-22 | Flo Technologies, Inc. | Thin film thermal mass flow sensor in fluid applications |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3012596A1 (en) | 2014-10-21 | 2016-04-27 | wenglor fluid GmbH | Measuring device for determining the flow speed of a medium in a conduit |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3509416A1 (en) * | 1985-03-15 | 1986-09-18 | Rota Apparate- Und Maschinenbau Dr. Hennig Gmbh & Co Kg, 7867 Wehr | Measuring device for determining the flow rate of a flowing medium |
DE3713981A1 (en) * | 1987-04-27 | 1988-11-17 | Robert Buck | HEAT TRANSFER MEASURING DEVICE, IN PARTICULAR FLOW CONTROLLER |
DE3943437A1 (en) * | 1989-04-05 | 1990-10-25 | Ifm Electronic Gmbh | Heat transfer measurement arrangement - has temp. measurement element on carrier foil clamped against housing requires no separate electronics housing |
DE4017877A1 (en) * | 1990-06-02 | 1991-12-12 | Hiss Eckart | Flow measurement sensor for wall mounted or in-flow use - has functional elements on tubular body mounted in measurement pin or over measurement body |
DE4120752A1 (en) * | 1991-06-24 | 1993-01-14 | Sensorenbau Gettorf Gmbh | Heat transfer measurement device housing - accepts threaded sensor which screws into housing wall and has cylindrical scale forming membrane w.r.t. measurement medium |
DE9408085U1 (en) * | 1994-05-17 | 1994-07-28 | Hiss Eckart | Sensor |
-
1996
- 1996-03-20 DE DE1996110885 patent/DE19610885B4/en not_active Expired - Lifetime
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3509416A1 (en) * | 1985-03-15 | 1986-09-18 | Rota Apparate- Und Maschinenbau Dr. Hennig Gmbh & Co Kg, 7867 Wehr | Measuring device for determining the flow rate of a flowing medium |
DE3713981A1 (en) * | 1987-04-27 | 1988-11-17 | Robert Buck | HEAT TRANSFER MEASURING DEVICE, IN PARTICULAR FLOW CONTROLLER |
DE3943437A1 (en) * | 1989-04-05 | 1990-10-25 | Ifm Electronic Gmbh | Heat transfer measurement arrangement - has temp. measurement element on carrier foil clamped against housing requires no separate electronics housing |
DE4017877A1 (en) * | 1990-06-02 | 1991-12-12 | Hiss Eckart | Flow measurement sensor for wall mounted or in-flow use - has functional elements on tubular body mounted in measurement pin or over measurement body |
DE4120752A1 (en) * | 1991-06-24 | 1993-01-14 | Sensorenbau Gettorf Gmbh | Heat transfer measurement device housing - accepts threaded sensor which screws into housing wall and has cylindrical scale forming membrane w.r.t. measurement medium |
DE9408085U1 (en) * | 1994-05-17 | 1994-07-28 | Hiss Eckart | Sensor |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1111377A1 (en) * | 1999-12-23 | 2001-06-27 | Fraunhofer-Gesellschaft Zur Förderung Der Angewandten Forschung E.V. | Method and device for determining the concentration of substances in a volume of liquid |
DE10154561B4 (en) * | 2000-11-22 | 2004-07-08 | Visteon Global Technologies, Inc., Dearborn | Mass air flow sensor bypass housing |
WO2003017741A1 (en) * | 2001-08-04 | 2003-02-27 | Robert Bosch Gmbh | Device consisting at least of two parts joined together |
US7024943B2 (en) | 2001-08-04 | 2006-04-11 | Robert Bosch Gmbh | Device consisting at least of two parts joined together |
DE102004055101B4 (en) * | 2004-08-10 | 2010-11-11 | I F M Electronic Gmbh | Assembly of a flow sensor, a passage and a channel disposed within the passage channel measuring channel |
DE102004040110A1 (en) * | 2004-08-18 | 2006-02-23 | Endress + Hauser Wetzer Gmbh + Co Kg | Method and device for determining and / or monitoring the mass flow |
EP1705463A1 (en) * | 2005-03-23 | 2006-09-27 | Federico Lanzani | Sensing device for measuring a fluid flow and a liquid level |
EP2522972A3 (en) * | 2011-05-09 | 2015-02-25 | Azbil Corporation | Calorific value measuring system and calorific value measuring method |
DE102013204470A1 (en) | 2013-03-14 | 2014-09-18 | Ferdinand Wind | Heat transfer meter |
DE102013204470B4 (en) * | 2013-03-14 | 2017-02-09 | Ferdinand Wind | Heat transfer meter |
US11280651B2 (en) * | 2019-03-25 | 2022-03-22 | Flo Technologies, Inc. | Thin film thermal mass flow sensor in fluid applications |
Also Published As
Publication number | Publication date |
---|---|
DE19610885B4 (en) | 2005-07-07 |
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Representative=s name: PATENTANWAELTE WOLF & LUTZ, DE |
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Owner name: AFM-SENSORIK GMBH, DE Free format text: FORMER OWNER: WIND, FERDINAND, DIPL.-ING., 88069 TETTNANG, DE Effective date: 20130129 |
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