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WO2016096460A1 - Débitmetre thermique à fonction de diagnostic - Google Patents

Débitmetre thermique à fonction de diagnostic Download PDF

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Publication number
WO2016096460A1
WO2016096460A1 PCT/EP2015/078531 EP2015078531W WO2016096460A1 WO 2016096460 A1 WO2016096460 A1 WO 2016096460A1 EP 2015078531 W EP2015078531 W EP 2015078531W WO 2016096460 A1 WO2016096460 A1 WO 2016096460A1
Authority
WO
WIPO (PCT)
Prior art keywords
sensor element
temperature
resistance
thermal
heating power
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.)
Ceased
Application number
PCT/EP2015/078531
Other languages
German (de)
English (en)
Inventor
Martin Arnold
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 Flowtec AG
Original Assignee
Endress and Hauser Flowtec AG
Flowtec AG
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 Flowtec AG, Flowtec AG filed Critical Endress and Hauser Flowtec AG
Publication of WO2016096460A1 publication Critical patent/WO2016096460A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • G01F1/696—Circuits therefor, e.g. constant-current flow meters
    • G01F1/6965—Circuits therefor, e.g. constant-current flow meters comprising means to store calibration data for flow signal calculation or correction
    • 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
    • G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
    • G01F25/10—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
    • G01P5/10—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring thermal variables
    • G01P5/12—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring thermal variables using variation of resistance of a heated conductor

Definitions

  • the invention relates to a thermal flow meter, in particular a thermal flow meter for determining and / or monitoring the mass flow and / or the flow rate of a fluid through a conduit having at least one sensor element and an electronic unit, and a method for operating such a flow meter. Furthermore, a statement about the state of the at least one sensor element can be made.
  • Flowmeter thus has a diagnostic function.
  • Corresponding field devices are manufactured and distributed by the applicant, for example, under the name t-switch, t-trend or t-mass.
  • the underlying measurement principles are accordingly made up of a large number of
  • a generic flow meter comprises at least two sensor elements, each of which has a temperature sensor designed as similar as possible, and at least one of the sensor elements is designed to be heated.
  • a temperature sensor designed as similar as possible
  • an additional resistance heater can be integrated within the respective sensor element.
  • the temperature sensor itself as
  • Resistance element, z. B. in the form of an RTD resistance element Resistance element, z. B. in the form of an RTD resistance element (Resistance
  • Temperature Detector in particular in the form of a platinum element, as it is also commercially available under the names PT10, PT100, and PT1000, be formed.
  • the resistance element also referred to as a resistance thermometer, is then on the implementation of a supplied electrical power, for. B. due to an increased power supply, heated.
  • the temperature sensor within a cylindrical sleeve, in particular a sleeve made of a metal, in particular made of stainless steel or Hastelloy arranged.
  • the sleeve then has the function of a housing which protects the temperature sensor, for example against aggressive media.
  • Temperature sensor must also be ensured that there is the best possible thermal contact between the heated temperature sensor and the sleeve.
  • the at least two sensor elements are introduced into a pipeline which is flowed through at least intermittently and partly by a flowable medium, such that they communicate with the Medium in thermal contact. They can either be introduced directly into the pipeline, or be integrated into a measuring tube, which can be installed in an existing pipeline. Both possibilities are the subject of the present invention, even if in the following always only one pipeline will be mentioned.
  • the passive temperature sensor is used to detect the temperature of the flowable medium.
  • the temperature of the medium is understood to mean the temperature which the medium has without an additional heat input of a heating unit.
  • the active sensor element is usually either heated so that sets a fixed temperature difference between the two temperature sensors, wherein the change in heating power is used as a measure of the mass flow and / or the flow rate. Alternatively, however, the fed heating power can be kept constant over time, so that the corresponding
  • the heat is dissipated from the active temperature sensor via heat conduction, thermal radiation and possibly also via free convection within the medium.
  • Temperature difference is then required, for example, a time constant amount of heat.
  • thermophysical properties of the medium and the pressure prevailing in the pipeline have an influence on the measured flow.
  • thermophysical properties in the form of characteristics or as components of functional determination equations within an electronic unit of the flowmeter deposited are for example, the thermophysical properties in the form of characteristics or as components of functional determination equations within an electronic unit of the flowmeter deposited.
  • the thermal resistance of an inner and an outer thermal resistance depends i.a. of individual components within the sensor element, e.g. inside the pods, off.
  • the outer thermal resistance depends i.a. of individual components within the sensor element, e.g. inside the pods, off.
  • resistance is influenced by deposit formation, material removal or material conversion (for example corrosion) on the surfaces of the respective sensor element that touch the medium.
  • a change in the external thermal resistance is thus relevant in particular in long-term operation and / or in contact with aggressive media.
  • gaseous or vaporous media the measurement of the mass flow or the
  • DE102005057687A1 describes a thermal flow meter with at least two heatable designed temperature sensors, wherein the first temperature sensor and the second temperature sensor alternately as a passive, unheated temperature sensor, which provides information about the current temperature of the medium during a first measurement interval, and as an active heated temperature sensor, the during a second measurement interval information about the mass flow of the medium through the pipeline provides, controllable.
  • a control / evaluation unit issues a message and / or makes a correction as soon as the during the first measurement interval and the second
  • Measurement interval provided corresponding measured values of the two
  • Temperature sensors differ from each other. In this way, deposit deposits and condensate formation can be detected.
  • DE102007023823A1 discloses a thermal flow meter with two phase-wise alternately or alternately heatable sensor elements and a method for its operation. The mass flow is then determined alternately on the basis of the respectively heated sensor element, wherein the respective non-heated sensor element is used to determine the medium temperature. From a comparison of the measured values obtained with the two sensor elements, a contamination of at least one of the two sensor elements can additionally be detected.
  • US8590360B2 is described to heat or cool a first heatable sensor element with a first heating power, and at the same time to heat or cool a second heatable sensor element with a second heating power.
  • the two heating powers are chosen so that the temperatures of the two sensor elements differ.
  • thermometers GB2140923A an in situ method and an apparatus for testing the properties of the respective thermometer has become known, in which a statement about the properties is possible on the basis of a model for heat transfer or for the corresponding transfer function, or defects can be detected on the resistance thermometer.
  • the reaction of the resistance of the thermometer is recorded to changes in temperature during a determinable in the duration and supplied heating power heating period.
  • the present invention therefore has the object, a thermal flow meter and a method for
  • the electronics unit is configured to
  • the supplied heating power can either be constant, ie correspond to a fixed value, or adjustable, such that during operation the supplied
  • Heating power can be changed, controlled and / or regulated.
  • a change in the internal thermal resistance of the at least one sensor element can be detected.
  • the diagnostic function can furthermore advantageously be carried out during the operation of the respective flowmeter.
  • the measuring device does not need to be specially removed. Also during the execution of the diagnostic function medium can flow through the pipeline.
  • the step response of the at least one sensor element can be detected, for example, if a previously unheated sensor element is heated from a certain point in time, or conversely, if the heating power supplied to a sensor element is switched off. But even with a change in each supplied heating power ⁇ from a first to a second value, the
  • Step response can be recorded. It is important that the change in the supplied heating power ⁇ occurs abruptly, and is not regulated continuously or steplessly.
  • An electronic unit according to the invention must be designed accordingly to record a step response, that is, have a sufficiently high sampling rate f for detecting the measured variable whose step response is to be recorded and analyzed. Ideally, the sampling rate should be in the range of milliseconds or less. It is therefore a method which can be implemented in a simple manner in a measuring device.
  • the procedure for carrying out an analysis of a step response of the at least one sensor element for diagnostic purposes is based on the following facts:
  • the abrupt change in the supplied heating power ⁇ also abruptly changes the heat transported by the heating unit within the sensor element to its surface, ie the heat propagation. This heat transfer depends in general on different factors and different physical, chemical and
  • the heat transfer is defined only by the variables mentioned. From the moment on which the heat transported reaches the surface of the sensor element, the heat transfer, however, by the on
  • the at least one sensor element comprises a
  • Housing in particular of a metal, in particular stainless steel or Hastelloy, wherein in the interior of the housing at least the temperature sensor, in particular an RTD resistance element, is arranged such that the housing and the temperature sensor are in thermal contact.
  • the housing protects the sensor element
  • the electronic unit comprises a memory unit on which memory unit at least one reference for a reaction of the sensor element to a sudden change of the supplied power is stored in the functional state.
  • This reference curve can be used at the time of manufacture or parameterization of the
  • Flowmeter are included.
  • the analysis of the step response can then be made from a comparison of a measured curve with a reference curve stored on the memory unit, for example by comparing the respective function values at specific predefinable characteristic times.
  • the electronics unit is designed so that it can record at least 100 measured values in a time interval of typically less than 100 ms. This requirement for a minimum sampling rate of the measured variable whose step response is analyzed ensures a sufficient number of measured values in that short time interval available for the detection of the step response.
  • the object of the invention by specifying a
  • a method for operating a thermal flow meter for determining the mass flow and / or a flow rate of a fluid medium in a pipeline comprising at least one sensor element and a
  • Electronic unit with a sampling rate in the range of milliseconds or less wherein the at least one sensor element is heated with a heating power, and whose temperature is detected, wherein from the heating power and / or temperature and / or at least one of at least the heating power and / or temperature derived Size of the mass flow and / or the flow rate of the medium are determined, wherein at a definable time, the heating power is changed rapidly, and wherein from the step response of the sensor element to the change in heating power generates a statement about the state of the at least one sensor element and / or output becomes.
  • a change in the internal thermal resistance of the at least one sensor element can be determined from the step response. This allows a statement about the functionality of the at least one sensor element, or about the state of individual components, e.g. within the sleeves, or also via solder connections.
  • the sudden change in the supplied heating power can be positive or negative.
  • the step response of a characteristic of the heating element dependent characteristic value of the sensor element is evaluated.
  • These sizes are particularly easy to capture.
  • the temperature is recorded anyway in a thermal flow meter, for example.
  • the at least one sensor element is recorded as a function of time and is, wherein by means of a comparison of
  • the at least one sensor element with at least one reference jump response of the temperature and / or the resistance to a change in the thermal resistance of the at least one sensor element is closed, and wherein in the case of exceeding a
  • the predeterminable limit value for the change of the thermal resistance a message about a malfunction of the at least one sensor element is generated and output.
  • the curve of the temperature or the electrical resistance changes as a function of the external heat transfer coefficient and / or the external flow conditions.
  • the gradient of the temperature and / or the resistance is determined, wherein by means of a comparison of the gradient of the step response of the temperature and / or the resistance and / or derived therefrom size of the at least one sensor element with the gradient of at least one Reference jump response of the temperature and / or resistance is closed to a change in the thermal resistance of the at least one sensor element, and
  • the measured step response and the reference step response may be more clearly visible through the analysis.
  • the time interval for recording the step response of the temperature T (t) and / or of the resistor R (t) is selected such that it is less than the time which is supplied by means of the abrupt change in the heating power
  • Heat is needed to get from the interior of the sensor element to its surface. Based on appropriate estimates, a maximum expected time period for the heat transfer within the at least one sensor element can be determined. This saves the storage of unnecessary measurements, which at a time
  • FIG. 1 is a schematic drawing of a thermal flow measuring device according to the prior art
  • Fig. 2 are schematic drawings of two typical sensor elements Fig. 3 (a) shows a temperature change as a function of time in response to a sudden change in heating power (b) is an electrical equivalent circuit diagram of a
  • Fig. 2; and Fig. 4 are graphs showing different temperature gradients by varying the internal thermal resistance in response to a power jump on a sensor element.
  • a thermal flow meter 1 according to the prior art is shown.
  • two sensor elements 4,7 are tightly integrated such that they are at least partially and at least temporarily in thermal contact with the medium 3.
  • Each of the two sensor elements 4, 7 comprises a housing 6, 6 a, which in this case is cylindrical, in each case one
  • Temperature sensor 5,8 is arranged.
  • the two temperature sensors 5, 8, each of the two sensor elements 4, 7 should be in thermal contact with the medium 3.
  • the first sensor element 4 is designed as an active sensor element that it has a heatable temperature sensor 5. It goes without saying that a sensor element 4 with external heating element, as mentioned above, also falls under the present invention. In operation, it can be done accordingly by supplying a
  • Heating power P1 are heated to a temperature T1.
  • the temperature sensor 8 of the second sensor element 7, however, is not heated and serves to detect the
  • the thermal flow meter 1 also comprises an electronic unit 9, which serves for signal acquisition, evaluation and feeding.
  • This electronic unit can optionally be assigned a memory unit 9a on which reference values or sensor-specific characteristics or characteristic quantities are stored.
  • Both thermal flow measuring devices 1 with more than two sensor elements 4, 7 have become known over the course of time, as have very different geometrical configurations and arrangements of the respective sensor elements 4, 7.
  • Fig. 2 are schematic, perspective views of two sensor elements, as they can be used for example for the flowmeter shown in Flg.1 shown. Both are basically designed as active sensor elements 4 and can be heated if necessary.
  • the two housings 6, 6 'each have the shape of a
  • Spacer 12 is also a resistance element 14 soldered, so that a good thermal contact and, correspondingly, a good heat conduction is ensured.
  • the second solder joint opposite surface 14a of the resistor element 14 is free in this example.
  • a second embodiment of a typical sensor element is shown in FIG. 2b.
  • the spacer 12 ' forms an interference fit with the housing 6' in the form of a pin sleeve. Usually, it is inserted during manufacture by means of the plug 1 1 'from the end face 10', starting in the housing 6 '. The plug 1 1 'is then welded to the housing 6', for example via a laser welding process.
  • the spacer 12 ' has the shape of a cylinder with a along the longitudinal axis extending groove 15', in which a resistance element 14 'is soldered.
  • the second solder joint opposite surface 14a 'of the resistor element 14' is also free in this example.
  • cavities are still filled with a suitable filling material of low thermal conductivity (not shown), such that inter alia the surfaces 14a opposite the respective solder joints, 14a 'of the respective resistive element 14,14' are covered by the filling material used in each case. Also not shown are any necessary connection cables.
  • the resistance element 14, 14 ' is a platinum element, for example a PT10, PT100 or PT1000 element, which is arranged on a ceramic carrier.
  • the spacer 12, 12 'in turn copper is often used, while the housing 6, 6' made of stainless steel.
  • the housing may also be provided with a coating from the outer surface.
  • FIG. 3 a the temperature as a function of time in response to a sudden change in the supplied heating power for a sensor element, as shown in FIG. 2, is shown by way of example.
  • the following description refers without limitation to the generality exclusively to the evaluation of the characteristic measure of the temperature. However, the respective assumptions and results can be easily transferred to other characteristic variables, such as electrical resistance.
  • the power supplied to the at least one sensor element is changed abruptly from a first value Pi to a second value P 2 .
  • the power loss at the sensor element kept constant.
  • Temperature is then measured at appropriate intervals.
  • the sampling rate is typically - ⁇ 1 ms in order to ensure a sufficient number of measured values for the small time interval over which the step response takes place.
  • the time interval 16 of interest for the analysis of the step response is marked in FIG. 3 by a circle. It is about a time interval of 100ms.
  • the temperature change in response to the power jump is determined solely by the geometric structure of the sensor element 4 and the heat propagation occurring within the sensor element, ie by the thermal resistances and heat capacities of the materials used in each case. The dependence of the
  • Heat transport from the individual components and material transitions can for example by a, such as. B. shown in Fig. 3b, equivalent circuit diagram are shown.
  • Top left is a sketch of a sensor element with integrated resistance element 14,14 'in the form of a arranged on a ceramic support 17 PlatinPlann Anlagenelements 18 shown. This is shown in the equivalent circuit shown as a heat source.
  • everybody Component of the sensor element is associated with an electrical resistor 19a-f and a capacitor 20a-f connected in parallel thereto.
  • the influence of the flowing fluid is also in the form of an electrical resistance R f
  • Sensor element as shown in Fig. 2, then arise in each case a resistor and a capacitor for the platinum element (R p i a tin. Cpiatin) 19 a, 20 a, for the ceramic carrier (Rceramic, C cer amic) 19 b, 20 b , for the solder joint (R SO ider, C S0
  • the temperatures surrounding the respective components are noted, namely the temperature of the sensor element T sen sor, the temperature of the environment T amb ient and the temperature at the surface of
  • the measurement duration which is smaller than the time required for the heat transfer from the heating unit to the surface of the sensor element, it is possible to ensure that the respectively recorded measured values, for example for the temperature, are independent of external influences, in particular independent of changes in the mass flow or the flow rate. This advantageously allows the measurement duration, which is smaller than the time required for the heat transfer from the heating unit to the surface of the sensor element.
  • Diagnostic function can be performed in the continuous operation of the flowmeter. Ideally, the diagnostic function can even run parallel to the determination of the
  • Mass flow and / or the flow rate can be performed.
  • Sensor element is ideally considered the first derivative, or the gradient of the temperature. In the present example, therefore, the rate of rise of the temperature is analyzed. This changes with an occurring sensor drift. If the sensor drift is caused merely by a change in the internal thermal resistance, the rate of rise of the temperature changes with changes in the internal thermal resistances and / or capacitances according to the equivalent circuit diagram from FIG. 3b. In the event, for example, that the resistance element 14, 14 'of the at least one sensor element 4, 4' comes off, the thermal resistance Rsoider between the spacer 12, 12 'and the resistance element 14, 14' increases due to formation of a thin air layer. Since air is a good electrical insulator with a small thermal
  • Resistance element 14,14 'outgoing heat can not be passed as fast to the spacer 12,12'. Accordingly, the rate of increase of the temperature measured at the sensor element 4,4 'increases. Similar considerations can be made for each of in the equivalent circuit shown resistors 19a-g and for the capacitors 20a-f are performed.
  • the temperature gradient which is normalized to the supplied heating power is particularly suitable as the measured variable.
  • Reference curves or reference values at characteristic predeterminable discrete time points are then advantageously stored on a memory unit 9a integrated within the electronic unit 9, by means of which the respective measured values can be compared. If a predefinable deviation between the respective reference and a measurement is determined, a message and / or warning for the customer is generated and
  • the permissible deviations can be adapted specifically for an application or for the respective requirements of the flowmeter. This allows the customer depending on the one given by him
  • Resistance element 14,14 varies.
  • the time constant ⁇ and the end value t end of the step response of the temperature can be determined in response to a power jump.
  • Deposit formation and / or erosion are made on the at least one sensor element, which are based on a change in the external thermal resistance.
  • sensor-specific characteristics of the time constant ⁇ or of the temperature rise AT t end -t start of the step response as a function of the mass flow, the flow velocity or one with the mass flow and / or the
  • Flow rate stored in a mathematically related quantities in the electronic unit offers the following advantages:
  • a sensor drift caused by a change in the internal thermal resistance can be detected independently of external influences, such as, for example, a flow that is not constant over time, or deposits, dirt or erosion on the sensor element.
  • the diagnostic function can be performed during operation, ie under process conditions.
  • the interruption of the measuring mode to carry out a diagnosis is a maximum of « 1 ms.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Measuring Volume Flow (AREA)

Abstract

L'invention concerne un débitmètre thermique (1) destiné à déterminer le débit massique et/ou la vitesse d'écoulement d'un milieu fluide (3) dans une canalisation (2) et un procédé pour faire fonctionner un débitmètre thermique, ayant au moins un élément de détection (4, 7) et une unité électronique (9) présentant une fréquence d'échantillonnage de l'ordre de quelques millisecondes ou moins. L'au moins élément de détection (4,7) est en contact thermique au moins partiellement et/ou temporairement avec le milieu (3) et comporte un capteur de température (5) pouvant être chauffé. L'unité électronique (9) est adaptée pour chauffer l'au moins un élément de détection (4, 7) à une puissance de chauffage (P), détecter la température (T) de celui-ci, déterminer à partir de la puissance de chauffage (P) et/ou de la température (T) et/ou d'une grandeur dérivée d'au moins une de ces grandeurs le débit massique et/ou la vitesse d'écoulement du milieu (3). La puissance de chauffage (ΔΡ) est modifiée soudainement à un temps déterminable (tdébut) et une information sur l'état de l'au moins un élément de détection est générée et/ou délivrée en sortie à partir d'une réponse transitoire de l'au moins un élément de détection à un changement soudain de la puissance de chauffage fourni (ΔΡ).
PCT/EP2015/078531 2014-12-19 2015-12-03 Débitmetre thermique à fonction de diagnostic Ceased WO2016096460A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014119237.0A DE102014119237B4 (de) 2014-12-19 2014-12-19 Thermisches Durchflussmessgerät mit Diagnosefunktion und zugehöriges Betriebsverfahren
DE102014119237.0 2014-12-19

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Publication Number Publication Date
WO2016096460A1 true WO2016096460A1 (fr) 2016-06-23

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2140923A (en) 1983-06-01 1984-12-05 Univ Manchester Resistance thermometer testing
EP1016855A2 (fr) * 1998-12-30 2000-07-05 ABBPATENT GmbH Procédé de mesure du débit avec un dispositif à film chaud
DE102005057687A1 (de) 2005-12-01 2007-06-06 Endress + Hauser Flowtec Ag Vorrichtung zur Bestimmung und/oder Überwachung des Massedurchflusses eines fluiden Mediums
DE102005057689A1 (de) * 2005-12-01 2007-06-06 Endress + Hauser Flowtec Ag Vorrichtung zur Bestimmung und/oder Überwachung des Massedurchflusses eines fluiden Mediums
WO2008142075A1 (fr) 2007-05-21 2008-11-27 Abb Research Ltd Procédé de diagnostic pour appareils de mesure de débit massique thermiques
DE102007023823A1 (de) 2007-05-21 2008-11-27 Abb Ag Thermischer Massendurchflussmesser und Verfahren zu seinem Betrieb
US8590360B2 (en) 2009-12-02 2013-11-26 Abb Research Ltd. Flowmeters and methods for diagnosis of sensor units

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10161771A1 (de) 2001-12-15 2003-06-18 Bosch Gmbh Robert Thermischer Sensor
WO2013085458A1 (fr) 2011-12-07 2013-06-13 Scania Cv Ab Procédé de test de capteurs de température et dispositif de test

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2140923A (en) 1983-06-01 1984-12-05 Univ Manchester Resistance thermometer testing
EP1016855A2 (fr) * 1998-12-30 2000-07-05 ABBPATENT GmbH Procédé de mesure du débit avec un dispositif à film chaud
DE102005057687A1 (de) 2005-12-01 2007-06-06 Endress + Hauser Flowtec Ag Vorrichtung zur Bestimmung und/oder Überwachung des Massedurchflusses eines fluiden Mediums
DE102005057689A1 (de) * 2005-12-01 2007-06-06 Endress + Hauser Flowtec Ag Vorrichtung zur Bestimmung und/oder Überwachung des Massedurchflusses eines fluiden Mediums
WO2008142075A1 (fr) 2007-05-21 2008-11-27 Abb Research Ltd Procédé de diagnostic pour appareils de mesure de débit massique thermiques
DE102007023823A1 (de) 2007-05-21 2008-11-27 Abb Ag Thermischer Massendurchflussmesser und Verfahren zu seinem Betrieb
US8590360B2 (en) 2009-12-02 2013-11-26 Abb Research Ltd. Flowmeters and methods for diagnosis of sensor units

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DE102014119237B4 (de) 2021-12-16
DE102014119237A1 (de) 2016-06-23

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