EP3563122A1 - VIBRONISCHES MEßSYSTEM ZUM MESSEN EINER MASSENDURCHFLUßRATE - Google Patents
VIBRONISCHES MEßSYSTEM ZUM MESSEN EINER MASSENDURCHFLUßRATEInfo
- Publication number
- EP3563122A1 EP3563122A1 EP17816482.8A EP17816482A EP3563122A1 EP 3563122 A1 EP3563122 A1 EP 3563122A1 EP 17816482 A EP17816482 A EP 17816482A EP 3563122 A1 EP3563122 A1 EP 3563122A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tube
- measuring
- temperature
- temperature sensor
- esp
- 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.)
- Pending
Links
Classifications
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- 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
- G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
- G01F1/78—Direct mass flowmeters
- G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
- G01F1/84—Coriolis or gyroscopic mass flowmeters
- G01F1/8409—Coriolis or gyroscopic mass flowmeters constructional details
- G01F1/8436—Coriolis or gyroscopic mass flowmeters constructional details signal processing
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- 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
- G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
- G01F1/78—Direct mass flowmeters
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- 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
- G01F1/74—Devices for measuring flow of a fluid or flow of a fluent solid material in suspension in another fluid
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- 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
- G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
- G01F1/78—Direct mass flowmeters
- G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
- G01F1/84—Coriolis or gyroscopic mass flowmeters
- G01F1/845—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits
- G01F1/8468—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits vibrating measuring conduits
- G01F1/8472—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits vibrating measuring conduits having curved measuring conduits, i.e. whereby the measuring conduits' curved center line lies within a plane
- G01F1/8477—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits vibrating measuring conduits having curved measuring conduits, i.e. whereby the measuring conduits' curved center line lies within a plane with multiple measuring conduits
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/02—Compensating or correcting for variations in pressure, density or temperature
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- 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
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- 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
- G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
- G01F1/78—Direct mass flowmeters
- G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
- G01F1/84—Coriolis or gyroscopic mass flowmeters
- G01F1/8409—Coriolis or gyroscopic mass flowmeters constructional details
-
- 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
- G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
- G01F1/78—Direct mass flowmeters
- G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
- G01F1/84—Coriolis or gyroscopic mass flowmeters
- G01F1/8409—Coriolis or gyroscopic mass flowmeters constructional details
- G01F1/8413—Coriolis or gyroscopic mass flowmeters constructional details means for influencing the flowmeter's motional or vibrational behaviour, e.g., conduit support or fixing means, or conduit attachments
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- 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
- G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
- G01F1/78—Direct mass flowmeters
- G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
- G01F1/84—Coriolis or gyroscopic mass flowmeters
- G01F1/8409—Coriolis or gyroscopic mass flowmeters constructional details
- G01F1/8422—Coriolis or gyroscopic mass flowmeters constructional details exciters
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- 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
- G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
- G01F1/78—Direct mass flowmeters
- G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
- G01F1/84—Coriolis or gyroscopic mass flowmeters
- G01F1/845—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits
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- 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
- G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
- G01F1/78—Direct mass flowmeters
- G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
- G01F1/84—Coriolis or gyroscopic mass flowmeters
- G01F1/845—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits
- G01F1/8468—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits vibrating measuring conduits
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- 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
- G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
- G01F1/78—Direct mass flowmeters
- G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
- G01F1/84—Coriolis or gyroscopic mass flowmeters
- G01F1/845—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits
- G01F1/8468—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits vibrating measuring conduits
- G01F1/849—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits vibrating measuring conduits having straight measuring conduits
- G01F1/8495—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits vibrating measuring conduits having straight measuring conduits with multiple measuring conduits
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- 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
- G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
- G01F1/86—Indirect mass flowmeters, e.g. measuring volume flow and density, temperature or pressure
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/02—Compensating or correcting for variations in pressure, density or temperature
- G01F15/022—Compensating or correcting for variations in pressure, density or temperature using electrical means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/02—Compensating or correcting for variations in pressure, density or temperature
- G01F15/022—Compensating or correcting for variations in pressure, density or temperature using electrical means
- G01F15/024—Compensating or correcting for variations in pressure, density or temperature using electrical means involving digital counting
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K3/00—Thermometers giving results other than momentary value of temperature
- G01K3/02—Thermometers giving results other than momentary value of temperature giving means values; giving integrated values
- G01K3/04—Thermometers giving results other than momentary value of temperature giving means values; giving integrated values in respect of time
Definitions
- the invention relates to a, esp. For measuring a physical quantity of a measured in one
- Pipe flowing fluid useful, vibronic measuring system In industrial measuring and automation technology, highly precise determination of measured values for at least one physical measured variable of a fluid flowing in a pipeline - for example a substance parameter, such as a density, and / or a flow parameter, such as a mass flow rate, of a gas Liquid or a dispersion - often vibronic, namely formed by a vibronic transducer device used measuring systems.
- a substance parameter such as a density
- a flow parameter such as a mass flow rate
- the transducer device comprises at least one tube having a lumen usually surrounded by a metallic wall, the same - from a inlet-side first end to an outlet-side second end extending - tube is arranged flowing from the first end towards the outlet end second end, through at least a part volume of the fluid to be measured and being vibrated during that time, and in which the transducer device serves both to actively energize and to evaluate mechanical vibrations of the tubes ,
- the transducer device comprises at least one tube having a lumen usually surrounded by a metallic wall, the same - from a inlet-side first end to an outlet-side second end extending - tube is arranged flowing from the first end towards the outlet end second end, through at least a part volume of the fluid to be measured and being vibrated during that time, and in which the transducer device serves both to actively energize and to evaluate mechanical vibrations of the tubes ,
- the transducer device serves both to actively energize and to evaluate mechanical vibrations of the tubes ,
- the transducer device serves
- the respective measuring and operating electronics can also be electrically connected via corresponding electrical lines to a superordinate electronic data processing system, which is usually arranged remotely and usually spatially distributed, to which the measured values generated by the respective measuring system are connected by means of at least one of these according to carrying measured value signal in real time, for example, in real time, to be passed.
- Measuring systems of the type in question are also usually provided by means of a provided within the parent data processing system
- Process controllers connected, for example, locally installed programmable logic controllers (PLC) or installed in a remote control room process control computers, where the generated by means of the respective measuring system and suitably digitized and encoded accordingly measured values are sent.
- PLC programmable logic controller
- the transmitted measured values can be further processed and used as corresponding measurement results, e.g. visualized on monitors and / or in control signals for other than field devices trained field devices, such. Solenoid valves, electric motors, etc., to be converted. Because modern
- Measuring arrangements usually monitored directly from such host computers and, where appropriate can be controlled and / or configured, in a corresponding manner via the aforementioned, mostly in terms of transmission physics and / or the transmission logic hybrid
- the data processing system usually also serves to condition the measured value signal supplied by the measuring system in accordance with the requirements of downstream data transmission networks, for example suitably digitizing and, if appropriate, converting it into a corresponding telegram and / or evaluating it on site.
- electrically coupled evaluation circuits are provided in such data processing systems with the respective connecting lines, which pre-process and / or further process the measured values received from the respective measuring system and, if necessary, convert them appropriately.
- For data transmission serve in such industrial data processing systems at least in sections, especially serial, field buses, such. FOUNDATION FIELDBUS,
- measured values can also be transmitted wirelessly to the respective data processing system.
- superordinate data processing systems usually also have the supply of the measured values supplied by the respectively connected measuring system.
- a supply circuit can be assigned to exactly one measuring system or corresponding electronics and, for example, to a corresponding evaluation circuit, together with the evaluation circuit assigned to the respective measuring system
- Fieldbus adapter united - in a common e.g. be designed as DIN rail module trained, electronics housing.
- Housing electronics housings and to wire together via external lines accordingly.
- Such a converter device has one by means of at least one,
- electro-dynamic, vibration generator formed electro-mechanical
- Exciter arrangement which is set up for useful vibrations of the at least one tube, namely mechanical vibrations with at least one predeterminable oscillation frequency of the tube about a static rest position associated therewith, for example mechanical
- this electrodynamic vibration exciter namely by means of a permanent magnet fixed to the tubes and by means of a to another, for example, also flowed through, fixed tube and formed with the permanent magnet interacting exciter formed vibration exciter used.
- useful vibrations of the tube are those vibrations which are suitable to induce in the flowing fluid of a Massend urchflußrate (m) dependent Coriolis forces, possibly also those that are suitable in the flowing fluid of a viscosity ( ⁇ ) dependent friction or To induce damping forces, and / or which are capable of inducing in the flowing fluid of a density (p) dependent inertial forces.
- a useful frequency namely as the oscillation frequency of the useful vibrations in vibronic measurement systems of the type in question usually one of the fluid leading at least one tube inherent resonant frequencies selected, typically namely one
- Resonant frequency of a Bieschwwingungsmodmodes of at least one tube Resonant frequency of a Bieschwwingungsmodmodes of at least one tube.
- the transducer device used in vibronic measuring systems of the type in question also each have one formed by at least two, for example electrodynamic or optical, vibration sensors
- Vibration sensor arrangement which is adapted to at least two vibration signals, namely in each case a vibration movements of the at least one pipe representing electrical measurement signal, for example, with one of a speed of the
- Wandlervoriquesen be spaced from each other in the flow direction at least one tube, such that one of the vibration sensors to form a
- converter devices of the type in question typically each comprise a cavity which is enveloped by a wall, for example a metallic wall
- Transducer housing within which at least one tube including the attached components of at least the vibration exciter and the at least one
- Vibration sensor are arranged in a manner permitting the aforementioned vibrations of the tube, namely, that between an inner surface of the wall of the transducer housing facing the cavity and a lateral surface of the wall of the tube, namely an outer surface of the wall of the tube facing the cavity, usually filled with air or an inert gas - is formed gap.
- Operating electronics typically housed within at least one comparatively robust, esp. Impact, pressure, and / or weatherproof, electronics housing.
- The, for example, made of stainless steel or aluminum, electronics housing can be located away from the transducer device and connected to this via a flexible cable; but it can also, for example, directly to the converter device, for example, on the aforementioned
- Transducer housing may be arranged or fixed.
- the measuring and operating electronics of such vibronic measuring systems are further adapted to receive and process each of the at least two vibration signals, for example to digitize and evaluate them.
- the measuring and operating electronics using the at least two oscillatory signals, repetitively generate a mass flow rate reading, namely a measured value representing the mass flow rate, or generate the measuring and operating electronics using the at least two
- Vibration signals a mass flow sequence, namely a sequence of temporally successive, each representing the mass flow rate of the fluid currently representing
- the measuring and operating electronics of vibronic measuring systems of the type described above typically also serve to provide at least one, for example, harmonic and / or timed, Generate driver signal for the at least one electro-mechanical vibration exciter.
- the same driver signal can, for example, with respect to a current and / or a
- the measuring and operating electronics is usually realized by means of one or more, possibly also as a digital signal processors (DSP) trained microprocessors, such that the measuring and operating electronics the respective measured values for the at least one substance or
- Conversion device for example, determined based on the at least two vibration signals obtained digital Abtats and inform of corresponding digital values, esp. Also in real time, provides.
- Measuring systems is another, for the operation, not least also for the precise determination of the
- Transducer temperature be suitable, a dependence of the vibration characteristics of the at least one tube or the vibration measurement of a spatial
- the same converter temperature is determined regularly in measuring systems of the type in question based on a detected on the wall of the at least one tube temperature.
- transducer devices such as u.a. also in the aforementioned US-A 57 96 012, US-A 2004/0187599, US-A 2005/0125167, WO-A 2009/134268, WO-A 01/71290,
- WO-A 98/52000 or WO-A 98/02725 therefore, further one or more each by means disposed within the space, and therefore not in operation contacted by the in the lumen of at least one tube temperature sensor, for example a
- the respective temperature sensor is in each case thermally coupled to the wall of the at least one tube and electrically coupled to the measuring and operating electronics.
- the temperature sensor can by means of a single temperature sensor or also formed by means of a plurality of such temperature-sensitive electrical or electronic components electrical circuits, such as in the form of a Wheatstone measuring bridge, be formed.
- the at least one temperature sensor is arranged to correspond to a temperature at a temperature measuring point formed by means of the respective temperature sensor
- Measuring point temperature in a corresponding Temperaturmeßsignal namely an electrical measurement signal representing the respective measuring point temperature, for example, with an electrical signal voltage dependent on n crafter Meßstellenentemperatur and / or a n crafter of the same temperature Meßstelleentemperatur electrical signal current to convert.
- the measuring and operating electronics can also be set up to generate measured values for the at least one measured variable using at least one temperature measuring signal generated by means of the converter device.
- Mass flow measurements occasionally surprisingly high measurement errors, for example, more than 0.05% or more than 1 kg / h, can be observed.
- the predefined temperature difference ⁇ & is regularly greater than with an intact transducer or with an intact tube, in particular with a wall not affected by a lining, and otherwise the same boundary conditions, it can still be assume no longer negligible extent for the actually desired high measuring accuracy.
- such increased measurement errors have been found to be very hot (> 50 K) or very cold (-50 K) in applications with comparatively fast-flowing high viscosity oils, such as in environments with ambient temperature surrounding the transducer device the filling of storage tanks or
- Fuel tanks on ships bunkering
- intermittently operated measuring points such as. in bottling plants, or also in connection with the measurement of the mass flow rate in recurrently with hot cleaning fluids fixed to be cleaned (CIP - cleaning in place) or to be sterilized (SIP - sterilization in place) procedural equipment.
- CIP - cleaning in place hot cleaning fluids fixed to be cleaned
- SIP - sterilization in place sterilization in place
- Measuring system is the associated transducer device for reducing such measurement errors tempered before the actual measurement, namely brought to a steady operating temperature, the one during the actual measurement corresponds to the expected fluid temperature or a corresponding thermal equilibrium state, or is a liquid to be measured suitably conditioned in advance, for example, namely vented. This is done here by a corresponding recirculation of each fluid to be measured.
- the measuring system has an additional, yet complex valve control and additional supply or return fluid lines.
- further investigations on conventional transducer devices used in such a way or subjected to measuring conditions in the laboratory have furthermore shown that the aforementioned phase difference between the at least two vibration signals is constant despite the constant mass flow rate
- Conversion device or actually stationary measurement conditions in a considerable, namely the measurement accuracy significantly impairing extent can scatter; this in particular even at low Reynolds numbers (Re) of less than 1000 having, in particular laminar, or held constant at less than 1 kg / h, for example, zero, amounting mass flow rate fluid flows.
- Re Reynolds numbers
- the calculation bearing on an object of the invention is to improve a measurement accuracy of measuring systems of the aforementioned type so that the thus for flowing fluids with low specific heat capacity and / or with a significantly deviating from an ambient temperature fluid temperature and / or thus for Fluid flow measurements with mass flow rates determined to be low Reynolds numbers ( ⁇ 1000) or less than 1 kg / h reproducibly have a low measurement error, in particular of less than 0.05% and / or less than 1 kg / h ,
- the invention consists in a vibronic measuring system for measuring a mass flow rate of, esp. In a pipeline, flowing fluid, esp. A gas, a liquid or a dispersion.
- the measuring system comprises a, in particular.
- the converter device comprises:
- a first tube having a lumen surrounded by, for example, a metallic wall, extending from an inlet-side first end to an outlet-side second end, provided for at least a partial volume of the fluid, starting from the inlet-side first end in the direction of the outlet-side second end to be flowed through and vibrated while;
- Temperature sensor positioned less far from the first end of the first tube is as from the second end of the same first tube and provided for or
- a first measuring point temperature namely a temperature of the wall of the first tube at an inlet side first temperature measuring point formed by means of the same temperature sensor and a first temperature measuring signal, namely a first electrical measuring signal representing the first measuring point temperature, for example with one of the first measuring point temperature dependent electrical signal voltage and / or with one of the same first measuring point temperature-dependent electrical signal current to convert;
- thermoly conductively coupled to the wall of the first tube for example, identical to the first temperature sensor, second temperature sensor, which is positioned less far from the second end of the first tube than the first end of the same first tube and the is provided or set up, a second measuring point temperature, namely a
- At least one, for example electrodynamic, vibration exciter for exciting and maintaining mechanical vibrations of the first tube to an associated static rest position, esp. Of bending vibrations of the first tube about an imaginary first imaginary axis of its first end imaginary connecting the imaginary axis;
- a, for example, electrodynamic, first vibration sensor for detecting mechanical vibrations of the first tube, which is positioned less far away from the first end of the first tube than from the second end of the same first tube and which is provided or set for, oscillatory movements of the first tube an inlet side first formed by means of the same vibration sensor
- Vibration sensor identical, second vibration sensor for detecting mechanical vibrations of the first tube which is positioned less far away from the second end of the first tube as from the first end of the same first tube and which is provided or furnished, oscillatory movements of the first tube to a means of the same Vibration sensor formed outlet side second
- vibration measuring and generate a same vibration representing second vibration signal such that between the first vibration signal and the second vibration signal, there is a phase difference, both from the mass flow rate and a between a temperature of the first vibration sensor and a temperature same second
- Vibration sensors established, for example at least temporarily with a
- Rate of change of more than 0.05 K / s time-varying, temperature difference is dependent.
- the measuring and operating electronics of the measuring system according to the invention is with each of the first and second vibration sensors as well as each of the first and second
- the measuring and operating electronics are set up to supply electrical power to the at least vibration exciter by means of an electrical exciter signal for effecting mechanical vibrations of the first tube.
- the measurement and operating electronics are set up, using both each of the first and second
- Mass flow sequence namely, a sequence of temporally successive, each generating the mass flow rate of the fluid currently representing mass flow rate measurements, such that at least for a reference mass flow rate, one by the
- the invention also consists in the measuring system according to the invention for measuring an at least one physical quantity, esp. A density and / or viscosity and / or a mass flow rate and / or a Volumen trimflußrate, one, esp. In a pipeline, flowing fluid, esp of a gas, a liquid or a flowable dispersion.
- the mass flow measured values determined for the reference mass flow rate are independent of the temperature difference, in that for at least one non-zero but nonetheless constant reference mass flow rate successively determined mass flow measured values are also different, namely more than 1 K amounting to and / or less than 10 K and / or spread over time with a range of more than 1 K and / or with a rate of change of more than 0.05 K / s time-varying, temperature differences do not differ by more than 0.01% of the same reference mass flow rate,
- the mass flow measured values determined for the reference mass flow rate are independent of the temperature difference, in each case representing a scale zero point of the measuring and operating electronics, namely in each case in the case of a converter device through which no fluid flows or respectively for one
- the, for example liquid or gaseous, reference fluid has a specific heat capacity of more than 1 kJ-kg _1 -K "1 and / or less than 4.2 kJ-kg- 1 -K " 1 ,
- the reference fluid is a liquid
- the reference fluid is a gas, for example air.
- the reference fluid is water, esp. With a fluid temperature of not less than 20 ° C.
- the reference fluid is an oil, esp. With a fluid temperature of not less than 20 ° C and / or with a viscosity of more
- the reference fluid is an oil, for example with a fluid temperature of not less than 20 ° C and / or with a viscosity of more than 10 "2 Pa s (Pascal seconds) and is also provided that the reference Mass flow rate as a function of an amount
- of a nominal diameter of the converter device specified in Sl basic unit for length (m meter) is less than
- the reference fluid is a gas, esp. With a fluid temperature of not less than 20 ° C and / or air.
- the reference fluid is a gas, for example having a fluid temperature of not less than 20 ° C and / or air, and is provided the reference mass flow rate as a function of an amount
- of a nominal size of the converter device given in Sl basic unit for length (m meter) is less than
- the temperature difference is greater on an inner side facing the lumen of an undesired lining infected wall than intact first tube, for example with not berisoneer wall of a wall.
- the measuring and operating electronics are set up to generate a phase difference sequence, namely a sequence of phase-successive phase-difference measured values representing the phase difference, using both the first oscillation signal and the second oscillation signal ,
- the measuring and operating electronics are arranged to use, using both the first temperature measuring signal and the second temperature measuring signal, a temperature difference sequence, namely a sequence of temporally successive ones, each representing the temperature difference
- the measuring and operating electronics are arranged to use, using both the first temperature measuring signal and the second temperature measuring signal, a temperature difference sequence, namely a sequence of temporally successive ones, each representing the temperature difference
- the measuring and operating electronics is adapted, using both the first temperature and the second Temperaturmeßsignals a temperature difference sequence, namely a sequence of time successive, each representing the temperature difference
- the measuring and operating electronics is set up, using both the first temperature and the second Temperaturmeßsignals a temperature difference sequence, namely a sequence of temporally successive, each representing the temperature difference
- Temperature difference sequence to generate an alarm that signals only a limited functionality of the converter device, esp. Due to a comparison with an original flow resistance modified flow resistance of the first tube.
- the measuring and operating electronics is arranged to set up the measuring and operating electronics for using both the first temperature measuring signal and the second temperature measuring signal
- Meßfluidtemperatur measured value namely to generate a temperature representative of a fluid flowing through the first tube measured value.
- the measuring and operating electronics is adapted to generate, using at least one of the vibration signals as well as at least one of the temperature measurement signals, a density measurement value representing a density of the fluid.
- the measuring and operating electronics are adapted to generate a viscosity reading representing at least one of the vibration signals and at least one of the temperature measurement signals, which represents a viscosity of the fluid.
- the measuring and operating electronics are arranged to generate a transducer temperature reading using both the first temperature measurement signal and the second temperature measurement signal
- Transducer temperature which differs from both the first measuring point temperature and the second measuring point temperature, such that an amount amämnten
- Transducer temperature represents at least approximately. According to a twenty-second embodiment of the invention it is provided that the measuring and
- Operating electronics has a multiplexer with at least two signal inputs and at least one signal output, which multiplexer is adapted to selectively, for example cyclically, Hartgate one of its signal inputs to the signal output, such that a present at each through-connected signal input signal is continued to the signal output ; and that the measuring and operating electronics having a, for example, a nominal resolution of more than 16 bits and / or "clocked with a more than 1000 s amount ends sampling, analog-to-digital converter with at least one signal input and at least one signal output has, which analog-to-digital converter is adapted to a signal applied to n beauem signal input analog input signal with, for example more than 1,000 amount ends s ", sampling rate and with a, for example, draw forming more than 16 bits, digital resolution in a n beaues input signal represent representative digital output signal and provide at the signal output.
- This embodiment of the invention
- the at least one signal output of the multiplexer and the at least one signal input of the analog-to-digital converter are electrically coupled to each other; and in that the first temperature sensor and the second temperature sensor are each electrically connected to the multiplexer, such that the first temperature measurement signal is applied to a first signal input of the multiplexer and that the second temperature measurement signal is applied to a second signal input of the multiplexer.
- Analog-to-digital converter at least temporarily represent exactly one of the two temperature measuring signals or the measuring and operating electronics the mass flow rate under
- Temperature sensor is positioned less far from the first end of the first tube than the second temperature sensor from the first end of the first tube. According to a twenty-fourth embodiment of the invention, it is provided that the second temperature sensor is positioned less far from the second end of the second tube than the first temperature sensor from the second end of the first tube. According to a twenty-fifth embodiment of the invention it is provided that the first
- Temperature sensor is positioned equidistant from the first end of the first tube as the second temperature sensor from the second end of the first tube.
- the first temperature sensor is positioned equidistant from the second end of the first tube as the second temperature sensor from the first end of the first tube.
- the first temperature sensor is positioned equidistant from a center of the first tube as the second temperature sensor.
- Temperature sensor and the second temperature sensor are identical. According to a twenty-ninth embodiment of the invention, it is provided that the first
- Temperature sensor is mechanically coupled in the same way with the wall of the first tube as the second temperature sensor.
- the converter device has no further temperature sensor contacting the wall of the first tube.
- Temperature sensor is coupled in the same way thermally conductive with the wall of the first tube as the second temperature sensor, esp. In such a way that one of the wall of the first tube to the first temperature sensor and further to the first temperature sensor
- ambient heat flowing current flow counteracting heat resistance is the same size as a one of the wall of the first tube to the second temperature sensor and further to an ambient temperature surrounding the second temperature sensor heat flow counteracting heat resistance.
- Vibration sensor in the same way thermally conductive with the wall of the first tube coupled as the second vibration sensor; for example, such that a heat flow flowing from the wall of the first pipe to the first vibration sensor and further to an atmosphere surrounding the first vibration sensor is equal to a heat resistance from the wall of the first pipe to the second vibration sensor and further to the second vibration sensor surrounding atmosphere flowing heat flow counteracting thermal resistance.
- Temperature sensor arrangement of the converter device axisymmetric with respect to at least one of the transducer device imaginarily cutting, for example, namely to one
- Vibration sensor arrangement mirror-symmetrical with respect to at least one
- Conversion device is imaginary cutting, in particular, parallel to a main axis of inertia of the first pipe, imaginary axis of symmetry. According to a thirty-fifth embodiment of the invention, it is provided that the first
- Temperature sensor is positioned equidistant from the first vibration sensor as the second temperature sensor from the second vibration sensor.
- the first tube is mirror-symmetrical with respect to at least one tube imaginarily intersecting, esp. Namely coincident with a main axis of inertia tube imaginary axis of symmetry.
- the first tube for example V-shaped or U-shaped, is curved.
- the first tube is at least partially, for example predominantly or even completely, straight, for example circular-cylindrical.
- the first tube is curved at least in sections, for example circular arc-shaped.
- the wall of the first tube at least partially, for example also predominantly or wholly, from a material such as a metal or an alloy consists, of which a specific thermal conductivity greater than 10 W / (m ⁇ K), and of which a specific heat capacity is less than 1000 J / (kg ⁇ K).
- the wall of the first tube consists of metal, for example an alloy containing iron and / or aluminum and / or chromium and / or titanium and / or zirconium and / or tantalum and / or nickel.
- the wall of the first tube is made of stainless steel.
- the first tube has a caliber that is more than 0.1 mm (millimeters).
- the first tube has a caliber that is more than 1 mm (millimeters).
- a unwound tube length of the first tube is more than 300 mm.
- the vibration exciter is set up, driven by the excitation signal, to stimulate or maintain mechanical vibrations of the first tube.
- the first temperature sensor by means of a, for example, a platinum measuring resistor, a thermistor or a thermocouple having, first temperature sensor and by means of a n personallyen first temperature sensor thermally conductively coupled to the wall of the first tube first
- Coupling body is formed, and that the second temperature sensor by means of - for example, a platinum measuring resistor, a thermistor or a thermocouple having and / or identical to the first temperature sensor - second temperature sensor and by means of a same second temperature sensor thermally conductively coupled to the wall of the second tube - for example, identical to the first coupling body - second coupling body is formed.
- This embodiment of the invention further provides that the first
- Coupling body for example, entirely, by means of a placed between the wall of the first tube and the first temperature sensor, esp. Both the outer surface of the wall and the first temperature sensor contacting and / or metal oxide particles offset, Plastic, for example, an epoxy resin or a silicone, is formed, and that the second coupling body, for example, by means of a placed between the wall of the second tube and the second temperature sensor, esp. Both the outer surface of the wall and the second temperature sensor contacting and / or with metal oxide particles, plastic, for example an epoxy resin or a silicone, is formed.
- Coupling body cohesively for example, adhesive
- the second temperature sensor for example by means of a plantetisers, to form the second coupling body cohesively, for example adhesively bonded to the lateral surface of the wall of the first tube.
- this further comprises: an insb. At least one of a, esp. Metallic, wall enveloped lumen having, from an inlet side first end to an outlet side second end extending
- the measuring system may also comprise an inlet-side first flow divider and an outlet-side second flow divider, wherein the first and the second tube may be connected to form flow-parallel connected flow paths to the, esp.
- the flow dividers can each be an integral part of a converter housing of the converter device.
- the latter further comprises: a converter housing having a cavity surrounded by a cavity, in particular a metallic wall, wherein at least the first tube is arranged within the cavity of the converter housing such that between one of the Cavity facing inner surface of the wall of the converter housing, a cavity facing the peripheral surface of the wall of the first tube, a gap is formed, and wherein the converter housing and the first tube are adapted, in the space, for example, a specific thermal conductivity of less than 1 W / (m (K) exhibiting, Fluid, such as air or an inert gas, to maintain a volume of fluid surrounding the first tube, such that the space facing the gap of the wall of the first tube to form a first interface of the first kind, namely an interface between a fluid and a solid Phase are contacted by held in the space fluid.
- a converter housing having a cavity surrounded by a cavity, in particular a metallic wall, wherein at least the first tube is arranged within the cavity of the converter housing such that between one of the Cavity facing inner surface of the wall of
- this further comprises: one, for example the connection of the converter device to a fluid supplying the
- Each of the connecting flanges also each have a sealing surface for fluid-tight or leak-free connection of the transducer device with a respective corresponding
- Have line segment of a process line and a minimum distance between the same sealing surfaces may define a, for example, more than 250 mm and / or less than 3000 mm amount of installation length of the transducer device, for example, such that a tube length-to-installation length ratio of the transducer device defined by a ratio of a developed tube length of the first tube to the same installation length of the converter device, more than 1.2 - esp. More than 1, 4 - amounts to.
- a basic idea of the invention consists in calculating the measured values for the
- Mass flow rate to account for or compensate for a dependence of the phase difference between the at least two vibration measurement signals on an occasionally established temperature gradient along the at least one pipe; this in particular in such a way that the low measuring errors of less than 0.05% (of the true measured value) aimed for vibronic measuring systems of the type in question also hinder those or not yet
- the invention is based i.a. on the surprising realization that predicted
- Vibration sensors temperature response
- Differences in temperature can not only occur on an inner side facing the lumen of an undesired coating infested wall, but surprisingly be observed on intact transducer devices for such measuring conditions in which an enthalpy of the fluid to be measured to a considerable extent by an enthalpy of the completely intact wall of the Pipe deviates and where the kinetic energy of the fluid flow
- FIG. 1 shows an especially suitable measuring system for use in industrial measuring and automation technology with a converter device having a converter housing and a measuring device housed in an electronics housing fastened here directly on the converter housing and operating electronics; schematically an embodiment of a measuring system according to FIG.
- FIG. 6 schematically shows a further exemplary embodiment of a measuring system according to FIG. 1; FIG. and Fig. 7 a by means of a plurality of discrete heat resistance in the manner of a
- Fig. 1 is a vibronic measuring system for measuring a schematically
- Measuring fluid temperature & FLI - flowing fluid FL1 (measuring fluid), such as a gas, a liquid or a flowable dispersion, or for recurrently determining the same mass flow rate m currently representing mass flow measurements x m shown schematically.
- the measuring system can also be set up to determine at least one further measured variable, for example a substance parameter, of the fluid FL.
- the same additional measured variable can be, for example, a density p, a viscosity ⁇ or else a measuring fluid temperature LI of the fluid flowing, for example through a pipeline.
- the measuring system comprises for this purpose a converter device MW for generating at least for the measurement of the mass flow rate useful measuring signals and one with the same
- Converter device MW electrically connected, in particular in the operation of externally via connection cable and / or supplied by means of internal energy storage with electrical energy, measurement and operation electronics ME for generating the measured by the transducer device detected measured variable (s) representing measured values or for sequential output such measured values x m as a respective currently valid measured value x x (x m - »x x ) of the measuring system at a corresponding
- Measuring output for example in the form of digital measurements and / or in real time.
- the converter device of the measuring system serves - as shown schematically in FIG. 2 or a combination of FIGS. 1 and 2 - in particular during operation to carry a partial volume of the respective fluid FL1 to be measured or through which the fluid flows various measurement signals for each by means of the transducer device to be detected physical
- the converter device is u.a. with at least one lumen 1 V enveloped by a wall, for example at least
- first tube 1 1 equipped.
- the wall of the tube 1 as usual transducer devices of the type in question, be metallic, for example, namely at least partially made of titanium, zirconium or tantalum, or, for example, consist of a stainless steel.
- the pipe 1 1 extends, as indicated, inter alia, in Fig. 2, from an inlet-side first end 1 1 a to a outlet side second end 1 1 b and is adapted to be flowed through by a fluid, starting from the inlet-side first end 1 1 a in the direction of the outlet-side second end 1 1 b and to be vibrated during this.
- converter device at least partially straight, thus partially (hollow) cylindrical, for example, namely circular cylindrical, and / or at least partially curved, for example, namely arcuately curved, be formed.
- the tube 1 1 may also be mirror-symmetrical with respect to at least one pipe imaginatively intersecting, for example, namely coincident with a main axis of inertia of the pipe, each imaginary axis of symmetry, for example, namely V-shaped or U-shaped.
- the wall of the tube 1 1 at least partially - for example, predominantly or wholly - consists of a material of which a specific thermal conductivity ⁇ 10 greater than 10 W / (m ⁇ K) and a specific Heat capacity cp10 are less than 1000 J / (kg ⁇ K).
- the tube 1 1 is provided or adapted to flow through at least a partial volume of the fluid FL1 in a flow direction, namely from the end 1 1 a in the direction of the end 1 1 b and vibrate during this to be left; in particular, such that the pipe 1 1 is allowed to perform useful oscillations, namely mechanical oscillations about an associated static rest position, which are suitable for inducing, in the fluid flowing therethrough, at least dependent on the mass flow rate m of the Coriolis forces.
- the useful vibrations performed by the pipe 1 1 may also be suitable for effecting friction forces in the fluid dependent on its viscosity ⁇ and / or inertial forces dependent on its density p.
- the transducer device may be formed as a vibration-type transducer useful as a constituent of a vibronic measurement system such as a Coriolis mass flowmeter, a density meter, and / or a viscosity meter.
- the wall of the tube 1 for example, of a metal or a metal alloy, for example, titanium, zirconium or tantalum or a
- the wall of the tube 1 1 each have a wall thickness s, which is more than 0.5 mm, and / or caliber D1 1 (inner diameter), which is more than 0.5 mm, having.
- the tube 1 1 may be further dimensioned so that it has an inner diameter-to-wall thickness ratio D / s, defined as a ratio of the inner diameter D of the tube to a wall thickness s of the wall of the tube, the less than 25: 1.
- the wall thickness of the tube 1 1 less than 10 mm and / or the Inner diameter D is less than 200 mm or that the tube 1 1 is dimensioned so that the inner diameter to wall thickness ratio D / s is more than 5: 1.
- the tube 1 1 can - as in converter devices of the type in question quite common - also in one
- Transducer housing 100 of the converter device be accommodated, such that - as shown in FIGS. 4 and 5 respectively and from a synopsis of FIGS. 1, 2, 4 and 5 readily apparent - the tube 1 1 within one and the same of a, for example, metallic and / or serving as an outer protective wall, the housing of the converter housing wrapped cavity of the transducer housing is arranged and that between a n managerer Cavity facing inner surface 100+ of the wall of the converter housing 100, a lateral surface 1 1 # the wall of the tube 1 1, namely an outer surface facing the cavity of the wall of the tube 1 1 a gap 100 'is formed.
- the tube 1 1 and the same converter housing are in this case also adapted, in the space 100 'one, for example, a specific thermal conductivity of less than 1 W / (m (K) exhibiting fluid FL2, for example, air or an inert gas under Formation of the tube 1 1 enveloping volume of fluid to hold, such that the space facing shell surface 1 1 # the wall of the tube 1 1 is contacted to form a first interface 111 1 first type, namely an interface between a fluid and a solid phase ,
- the converter device MW can furthermore be set up in the course of a fluid leading, for example designed as a rigid pipeline,
- a first connection flange serving to connect the same to a fluid segment of the process line, and a second connection flange serving to connect to a line segment of the process line serving to discharge the fluid can be provided on the outlet side of the converter device.
- the connecting flanges 13, 14 can, as in converter device of the type in question quite common or as indicated in Fig. 2, possibly also end in theticianunta
- Converter housing 100 integrated, namely be formed as an integral part of the converter housing.
- each of the connecting flanges 13, 14 each have a sealing surface for fluid-tight or leak-free connection of the converter device with a respective corresponding line segment of a process line and that also a smallest distance between the same sealing surfaces
- Insertion length LMW of the converter device defined; this in particular in such a way that the same installation length LMW is more than 250 mm and / or less than 3000 mm and / or in such a way that a tube length-to-installation length ratio LH / LMW of the converter device, defined by a ratio of a unwound tube length Ln of the tube 1 1 for the above insertion length LMW more than 1.2, for example, more than 1, 4.
- the aforementioned was completed Pipe length l_n of the pipe 1 (extended length) may also be more than 300 mm, for example.
- DSP Signal processor
- Housed electronics housing 200 of the measuring system may, depending on the requirements of the measuring system, for example, also impact and / or explosion-proof and / or hermetically sealed.
- the meter electronics ME as shown schematically in Fig. 2 in the manner of a block diagram, a measuring signals of the converter device MW processing, for example by means of a microprocessor formed, measuring and evaluation circuit ⁇ having the corresponding measured values for the generated by the measuring system to be detected measured variable.
- the measuring and evaluation circuit ⁇ of the measuring and operating electronics ME can, for example, by means of at least one
- Microprocessor and / or a digital signal processor (DSP) having microcomputer be realized.
- the program codes to be executed therefrom, as well as the control of the respective measuring system, serve operating parameters, such as, for example, also setpoints for by means of the measuring and
- Operational electronics implemented regulators or controller algorithms can, as also shown schematically in FIG. 2, e.g. stored persistently in a non-volatile data memory EEPROM of the measuring and operating electronics ME and when starting the same into a, e.g. In the microcomputer integrated, volatile data storage RAM can be loaded.
- the measuring and operating electronics ME can also be designed so that they with regard to the circuit structure of one of the above-mentioned prior art, such as the US-B 63 1 1 136, known measuring and operating electronics or
- a transmitter on the part of the applicant eg under the designation "PROMASS 83F", Coriolis mass flow / density meter.
- the generated by means of the measuring and operating electronics measured values ME x x (x m, x P, ⁇ ⁇ , xs ”) can in the shown here measuring system, for example, on location, namely at the measurement point formed by means of the measuring system, displayed immediately , To visualize by means of the
- Measuring system generated and / or optionally meter internally generated
- the, for example, also (re-) programmable or remotely adjustable, measuring and operating electronics ME also be designed so that they in the operation of the measuring system with this parent electronic data processing system, such as a programmable logic controller (PLC), a personal computer (PC) and / or a workstation, via a data transmission system, for example a fieldbus system, such as
- FOUNDATION FIELDBUS, PROFIBUS, and / or wirelessly by radio measuring and / or other operating data, such as current measured values, system diagnostic values,
- the measuring and operating electronics ME can be designed so that they can be powered by an external power supply, for example via the aforementioned fieldbus system.
- the measuring and operating electronics ME can, for example, have such an internal power supply circuit NRG for providing internal supply voltages UN, which during operation is supplied by an external energy supply provided in the abovementioned data processing system via the aforementioned fieldbus system.
- the measuring system may be formed, for example, as a so-called four-wire device, in which the internal
- Data processing circuit or an external data transmission system can be connected.
- the measuring and operating electronics can also be designed so that they, as shown, inter alia, in the aforementioned US-A 2006/0161359, by means of a, for example, configured as a 4-20 mA current loop, two-wire connection the external electronic data processing system is electrically connected and is supplied with electrical energy and can transmit measured values to the data processing system, possibly also using HART Multidrop.
- the measuring system for coupling to a fieldbus or other electronic communication system
- the, for example, on-site and / or via communication system (re-) programmable, measuring and operating electronics ME to the have a corresponding - for example, one of the relevant industry standards, such as the IEC 61 158/1 EC 61784 compliant - communication interface COM for data communication, eg for transmitting measured and / or operating data, thus the measured values representing the respective measured variable, to the previously mentioned programmable logic controller (PLC) or a higher level process control system and / or for receiving setting data for the measuring system.
- PLC programmable logic controller
- the electrical connection of the converter device to the measuring and operating electronics can by means of appropriate
- Connecting lines take place from the electronics housing 200, for example via
- Cable bushing are guided in the converter housing 100 and laid at least partially within the converter housing 100.
- the leads can thereby at least partially as at least partially covered by an electrical insulation conductors be formed, eg inform of "twisted pair" cables, ribbon cables and / or coaxial cables.
- the connection lines can be formed, at least in sections, also by means of conductor tracks of, for example, a flexible or partially rigid and partially flexible, optionally also painted, printed circuit board. also the aforementioned US-A 2001/0037690 or WO-A 96/07081.
- the converter device further comprises a means of at least one - for example, electrodynamic, namely formed by immersion armature coil or as a voice coil
- the converter device furthermore comprises a first vibration sensor 51 which is typified by at least one, for example electrodynamic and / or vibration generator, and by means of a,
- vibration sensor 51 For example, electrodynamic and / or to the vibration sensor 51 identical, second vibration sensor 52 formed sensor assembly S.
- the vibration sensor 51 is adapted to vibrational movements of the tube 1 1 at a means of the same
- Oscillation signal s2 a u.a. also from a mass flow rate of the flowing through the pipe 1 1 fluid (co-) dependent phase difference exists.
- the vibration sensor 51 positioned less far from the end 1 1 a of the tube 1 1 away from the end of 1 1 b and the vibration sensor 52 less far from the end 1 1 b of the tube 1 1 positioned away as of the end 1 1 a, esp.
- the vibration sensor 51 is positioned equidistant from the end of 1 1 a as the vibration sensor 52 from the end of 1 1 b.
- the vibration sensor arrangement thus formed by means of the two vibration sensors 51, 52 can - as well with converter device of the type in question quite common - also
- the vibration sensor 51 is after another Embodiment of the invention in the same way thermally conductive with the wall of the at least one tube 1 1 as the vibration sensor 12, esp.
- a one of the wall of the tube 1 1 to the vibration sensor 51 and further to a vibration sensor 51 surrounding atmosphere flowing heat flow counteracting thermal resistance is the same as a one of the wall of the pipe 1 1 to the vibration sensor 52 and further to a surrounding the vibration sensor 52 flowing heat flow counteracting heat resistance.
- Vibration sensor 52 established, for example, at least temporarily with a
- the converter device according to the invention - as shown in Fig. 2, 3a, 3b as well as in Fig. 4 and 5 - further comprises a mechanical, yet thermally conductive with the Wall of the tube 1 1 coupled first temperature sensor 71 and a mechanically, nevertheless thermally conductive also with the wall of the tube 1 1 coupled second temperature sensor 72.
- the temperature difference .DELTA..beta Is regularly formed larger with intact tube 11, in particular with a wall not covered by a covering, and otherwise identical boundary conditions.
- the temperature sensors 71, 72 are also electrically connected to the measuring and operating electronics ME, for example, by two of the aforementioned electrical leads.
- the temperature sensor 71 is, as also apparent from Figs. 2 and 3a respectively, less far from the first end 1 1 a of the tube 1 1 positioned away as from the second end 1 1 b the same tube 1 1, while the temperature sensor 72, such also seen from Fig.
- the temperature sensor 71 is positioned equidistant from the end 1 1 a of the tube 1 1 as the temperature sensor 72 from the end of 1 1 b or that the temperature sensor 71 equidistant from the end of 1 1 b of the tube 1 1 removed is positioned as the temperature sensor 72 from the end 1 1 a.
- the temperature sensor 71 is positioned equidistant from the end 1 1 a of the tube 1 1 as the temperature sensor 72 from the end of 1 1 b or that the temperature sensor 71 equidistant from the end of 1 1 b of the tube 1 1 removed is positioned as the temperature sensor 72 from the end 1 1 a.
- Temperature sensor 71 for example, equidistant from a center of the tube 1 1 to be positioned as the temperature sensor 72. Furthermore, the two
- Temperature sensors 71, 72 also be positioned so that the temperature sensor 71 and the Temperature sensor 72, as also indicated in Fig. 2 or from a synopsis of Fig. 2, 4 and 5 readily apparent, based on a, for example, with a main flow direction of the converter device matching, imaginary longitudinal axis L of the converter device azimuthal - for example, the same in projection on a same longitudinal axis L as
- the two temperature sensors 71, 72 can also be positioned or arranged so that a means of n maliciouser temperature sensors 71, 72 formed
- Temperature sensor arrangement of the converter device is axially symmetrical with respect to at least one imaginary axis of the imaginary intersecting imaginary axis of symmetry, for example, a parallel to a main axis of inertia of the tube 1 1 imaginary axis of symmetry.
- the temperature sensor 71 may also be positioned equidistant from the vibration sensor 51, for example, like the second temperature sensor 72 from the vibration sensor 52.
- the temperature sensor 71 is especially designed for this purpose
- Measuring point temperature 01 namely a temperature at one by means of the same
- Temperature sensor 71 formed first temperature measuring, to detect and in a first Temperaturmeßsignal ⁇ 1, namely a first measuring point temperature 01 representing the first electrical measurement signal to convert.
- the temperature sensor 72 is provided or adapted to detect a second measuring point temperature 02, namely a temperature at a second temperature measuring point formed by the same temperature sensor 72, and a second temperature measuring signal ⁇ 2, namely a second measuring point temperature 02
- the temperature sensor 71 is thermally conductively coupled in the same way with the wall of the tube 1 1 as the temperature sensor 72; This, for example, such that a one of the wall of the tube 1 1 to the temperature sensor 71 and further to a same temperature sensor 71 surrounding atmosphere flowing heat flow counteracting heat resistance is the same as a one of the wall of the tube 1 1 to the temperature sensor 72 and on a heat flow flowing counter to the temperature sensor surrounding the heat flow counteracting heat resistance.
- the temperature sensor 71 is mechanically coupled in the same way with the wall of the tube 1 1 as the temperature sensor 72.
- the temperature sensor 71 is according to a further embodiment of the invention - as shown schematically in Fig. 4 - by means of a within the
- Coupling body 712 identical - second coupling body 722 may be formed.
- Platinum measuring resistor, a thermistor or a thermocouple may be formed. Furthermore, each of the temperature sensors 71 1, 721 with the respective associated coupling body 712 or 722 by means of a suitable cohesive connection, for example, namely an adhesive bond or a soldering or welding connection, and / or by embedding in the respective cohesive connection, for example, namely an adhesive bond or a soldering or welding connection, and / or by embedding in the respective
- Coupling body 712 or 722 be connected.
- thermally well conductive connection between the wall of the tube and the temperature sensor 71 of this according to another embodiment of the invention is materially connected to the lateral surface 1 1 # the wall of the tube 1 1, namely, namely adhesive or by means Soldering or welding connection.
- Soldering or welding connection For producing such a material connection between pipe 1 1 and
- Temperature sensor 71 may e.g. a dressing, thus a plastic based on epoxy resin or silicone-based, for example, a silicone elastomers or a 1- or
- the plastic used to connect the temperature sensor 71 and tube 1 1 may also be mixed with metal oxide particles in order to achieve the best possible heat conduction.
- the above-mentioned coupling body 712 itself - partially or wholly - made of plastic, for example, in such a way that placed between the temperature sensor 71 1 and wall or both the lateral surface 1 1 # the wall and the temperature sensor 71 1 contacting, possibly also monolithic plastic molding serves as a coupling body 712 or the entire
- Coupling body 712 from - for example, one or more layers on the wall of the tube 1 1 applied, thus between the wall of the tube 1 1 and the first temperature sensor 71 1 placed plastic.
- the temperature sensor 72 may equally be materially connected to the lateral surface 1 1 # of the wall of the tube 1 1, for example, namely adhesively or by means of a soldering or welding connection.
- the coupling body 722 may be made of a material of which a specific thermal conductivity ⁇ 2 greater and / or of the material has a specific heat capacity cp722 of less than 1000 J / (kg ⁇ K), for example of the same material as that
- Coupling body 712 can be readily formed by appropriate selection of their respective production actually used materials such that the specific thermal conductivity ⁇ 722 a material of the second coupling body 722 equal to a specific thermal conductivity ⁇ 712 a material of the coupling body 712 and / or the specific heat capacity cp722 of the material of the coupling body 722 is equal to a specific heat capacity cp712 of the material of the first coupling body 712.
- the second coupling body 722 of the temperature sensor 72 is at least partially made of a plastic or formed by means of a suitably placed between the temperature sensor 721 and the wall of the tube 1 1 plastic body.
- a suitably placed between the temperature sensor 721 and the wall of the tube 1 1 plastic body is according to another embodiment of the invention.
- Each of the two aforementioned slices can be formed as one of the lateral surface of the wall of the tube 1 1 each adapted passage opening having - for example, substantially annular or, as also shown in Fig. 6a and 6b respectively, substantially rectangular - disc, each on the tube 11 is pushed, such that the disc Namely tube 1 1 surrounds or one of the lateral surface of the wall of the tube 1 1 facing the inner surface of the
- lateral surface 1 1 # at least partially contacted.
- Each of the two aforementioned slices for example, each as both coupling body 712 or 722 of the temperature sensor 71 or 72 or as a part thereof, as well as a on or
- each of the two temperature sensors is thermally coupled to the pipe 11 by the coupling body 712 of the temperature sensor 71 enclosing the surface 1 1 # of the wall of the pipe 11 to form a first interface 1121 second type, namely an interface between two solid phases, and the coupling body 722 of the temperature sensor 72, the lateral surface 1 1 # the wall of the tube 1 1 to form a second Contact interface 1122 of the second kind.
- each of the two boundary surfaces 1121, II22 has in each case a surface area determined by the specific design of the respective coupling body 712 or 722, and thus given. Accordingly, as shown also in FIG. 7, by way of an equivalent circuit diagram for a resistance network formed by means of a plurality of discrete heat resistors, a temperature difference ⁇ 1 prevailing between the interface 1121 of the second type and the first temperature measuring point is effective
- Temperaturmeßstelle flowing heat flow Q2 a thermally conductively connected to the second temperature measuring - here also primarily by heat conduction
- each of the thermal resistances R1 and R2 or each of the temperature sensors 71, 72 is dimensioned so that each each of the thermal resistances R1 and R2 is less than 1000 K / W, for example, less than 25 K / W.
- the two aforementioned heat resistances R1, R2 are further dimensioned so that a total of
- each of the coupling bodies 712 and 722 is further provided for each of the coupling bodies 712 and 722 to be designed in such a way that both the coupling body 712 and the coupling body 722 in the Result each have a heat capacity C1 or C2 inherent, which is less than 2000 J / K; this is advantageously also such that the heat capacity C1 of the first coupling body 712 and the heat capacity C2 of the second coupling body 722 satisfies a condition ⁇ - ⁇ 1, and / or that at least the
- Coupling body 712 has a specific heat capacity, which is less than 200 J / (kg ⁇ K), but if possible less than 100 J / (kg ⁇ K). Due to the typically desired for temperature sensors of the type in question compact design and the typically used, namely thermally highly conductive materials also exists a close
- Thermal resistances R1, R2 of the coupling body 712 or 722 in the manner described above are thus also achieved that each of the temperature sensors 71, 72 each have only a comparatively low thermal inertia with respect to the respective tube wall temperature
- each rapid changes in the respective pipe wall temperature can follow, or vice versa that each of the two Meßstellenentemperaturen 01, 02 not or at most only a small rate of change of the pipe wall temperature, namely a speed at which the respective pipe wall temperature changes over time, is dependent.
- Gap 100 is also quite common, as with transducer devices of the type in question, and as indicated schematically by dotted hatching in FIGS. 4 and 5, respectively, with one, for example a specific thermal conductivity F of less than 1 W / (m ⁇ K) ), fluid FL2 filled to form a tube 1 1 enveloping volume of fluid.
- the fluid FL2 held in the intermediate space 100 'or the fluid volume formed therewith has a possibly referred to as pipe ambient temperature 0FL2, possibly also variable over time
- the converter housing and the tube 1 1 are arranged to hold the same FL2 fluid in the space 100 ', such that the
- Interspace 100 'facing lateral surface 1 1 # contacted the wall of the tube 1 1 to form a second interface 1112 first type of fluid FL2 vorhaltem in the space, thus the tube to the fluid in the space 1 00' formed fluid volume is thermally coupled.
- air or an inert gas such as nitrogen or a noble gas, in particular helium, can serve as fluid FL2.
- an outer surface of the temperature sensor 71 facing the gap 100 ' is also formed to form a third interface 111 3 of the first type (interface between a fluid and a solid phase) and a gap 100'.
- Each of the thermal resistances R3 and R4 is advantageously sized to be less than 20,000 K / W, especially less than 10,000 K / W.
- the temperature sensor 71 and the temperature sensor 72 is further designed according to a further embodiment of the invention such that the thermal resistance R3 and the thermal resistance R4 more than 500 K / W, in particular more than 5000 K / W.
- the temperature sensor 71 also has a temperature sensor 71 1 thermally coupled with the fluid volume formed in the space coupling third coupling body, the same volume of fluid contacted to form the third interface 1113 first type.
- Namely coupling body can at least partially, esp. Namely predominantly or entirely, consist of a material of which a specific thermal conductivity greater than the specific thermal conductivity F held in the space FL2 fluid and / or greater than 0, 1 W / (m ⁇ K) and of which a specific heat capacity is smaller than a specific heat capacity cpF of the fluid FL2 held in the space and / or smaller
- Coupling body matched to the fluid FL2 held in the intermediate space also be selected so that a ratio of the specific thermal conductivity of the same material to the thermal conductivity F of the fluid held in the space FL2 is greater than 0.2, and / or that a ratio of the specific heat capacity of the same material Heat capacity cpF of the fluid FL2 held in the gap is smaller than 1.5.
- the third coupling body can - for example, completely - by means of a temperature applied to the temperature sensor 71 1 of the temperature sensor 71, for example, with metal oxide particles offset, plastic, such. an epoxy resin or a silicone.
- the same third coupling body possibly also entirely, by means of a tissue tape applied to the temperature sensor 71 1, for example a glass fiber cloth tape, or by means of a metal sheet applied to the temperature sensor 71 1, such. a sheet metal strip made of stainless steel, be formed.
- the temperature sensor 72 by means of another, namely a
- Temperature sensor 721 thermally be formed with the fourth volume coupling body coupling in the space formed, which contacts the fluid volume formed in the gap 100 'to form the fourth interface 1114 first type.
- the fourth coupling body can advantageously also identical to the aforementioned, the temperature sensor 71 1 thermally coupled to the fluid volume formed in the intermediate space 100 'third coupling body of the
- Temperature sensor 71 may be formed. In the same way is also within the tube 1 1, namely at the lumen thereof facing, thus guided by the lumen FL1 fluid
- Each of the aforementioned thermal resistances R1, R2, R3 and R4 is - as already mentioned - each authoritative or entirely by material characteristics, such.
- Coupling body as well as an area Ath at the same heat flow respective effective cross-sectional area of the respective coupling body for example, namely, the surface area of respective boundary surfaces 1121, II22, and / or defined by corresponding material characteristics of the wall of the tube 1 1 and the fluid FL2 held in the intermediate space 100 ', therefore already alone by previously at least approximately known, nevertheless substantially immutable parameters over a longer period of operation.
- Thermal resistances R1, R2, R3, R4 by means of n beautch parameters ( ⁇ , Ath, Uh) previously determined sufficiently accurate, are, for example, by experimental measurements and / or by
- thermo resistance R1 or R2 mitbehavder - namely a related to a heat flow due to heat conduction temperature drop
- the thermal resistance R1, R2, R3, R4 each mitbequed
- Heat transfer resistances are sufficiently well defined or sufficiently determined in advance. Alternatively or in addition, the thermal resistance R1, R2, R3, R4 or
- thermal resistance conditions for example, also be determined experimentally by means of calibration measurements carried out on the respective transducer device.
- the temperature sensor 71 In order to provide the temperature sensor 71 with the lowest possible thermal inertia with respect to temporal changes in the pipe wall temperature of the pipe 1 1, on the other hand but also to achieve the best possible thermal coupling of the temperature sensor 71 to the wall of the pipe even with the most compact design of the coupling body 712 according to a further embodiment of the invention, at least partially - for example, predominantly or wholly - made of a material, for example, namely a thermal adhesive, of which a specific thermal conductivity ⁇ 712 greater than a specific
- the material of the coupling body 712 is further selected such that a ratio ⁇ 712 / ⁇ of the specific thermal conductivity ⁇ 712 of the same material of the coupling body 712 to the specific thermal conductivity ⁇ of the fluid FL2 held in the gap is greater than 2, and / or a ratio cp712 / cpF of a specific heat capacity cp712 of the same material of the coupling body 712 to the heat capacity cpF of the fluid FL2 held in the space is smaller than 1.5, in particular in such a way that the specific Heat capacity cp712 is smaller than a specific heat capacity cpF of the fluid held in the space.
- Temperature sensor 72 at least partially (or even entirely) made of the same material as the coupling body 712 of the temperature sensor 71 to an equally low thermal inertia of the temperature sensor 72 with respect to temporal changes of
- the first temperature sensor and the second temperature sensor are identical, namely that both the temperature sensor and coupling body used for it as well as the thermal coupling of the aforementioned components with each other or to the pipe and in the Interspace vorunone fluid are substantially equal.
- the measuring and operating electronics ME are connected both to each of the at least two vibration sensors 51, 52 and to each of the two temperature sensors 71, 72 as well as electrically connected to the at least one vibration exciter 41, for example, in each case by means of corresponding connecting wires.
- the measuring and operating electronics ME, 6 For the purpose of reducing the cost of the electrical connection of the temperature sensors of the converter device with the measuring and operating electronics ME or in order to enable easy wiring of the measuring and operating electronics ME with the same temperature sensors, the measuring and operating electronics ME, 6, according to a further embodiment of the invention, a multiplexer with at least two signal inputs and at least one signal output and a clocked, for example, a nominal resolution of more than 16 bits and / or clocked at a more than 1000 s " sampling rate,
- Analog-to-digital converter ADC with at least one signal input and at least one
- multiplexer MUX is particularly adapted to optionally, for example, cyclically, turn on one of its signal inputs to the signal output, such that a signal applied to each through-connected signal signal is continued to the signal output, while the analog-to-digital converter ADC is adapted to a signal applied to n freelanceem signal input analog input signal with a - for example, namely, more than 1000 s "amount ends - sampling rate fA and with a digital
- Resolution N - for example, more than 16 bits - in a same input signal
- the at least one signal output of the multiplexer and the at least one signal input of the analog-to-digital converter are electrically coupled to one another and the temperature sensor 71 and the temperature sensor 72 are in each case electrically connected to the multiplexer MUX, in that the temperature measuring signal ⁇ 1 at a first signal input of the multiplexer MUX and that the temperature measuring signal ⁇ 2 applied to a second signal input of the multiplexer MUX.
- Analog-to-digital converter to generate ADC.
- the measuring and operating electronics ME is further set up for a
- Excitation device E for example, whose at least one vibration generator 41, driving - for example, to a predetermined voltage level and / or to a predetermined current and / or to a predetermined frequency regulated - excitation signal e to generate the one excitation frequency, namely a frequency corresponding signal frequency , or for effecting mechanical vibrations of the pipe 1 1 by means of n designateden electrical exciter signal e1 electrical power into the at least vibration generator 41 feed.
- excitation signal e1 is used in particular to feed the at least one vibration exciter controlled at least with the required for exciting or maintaining the Nutzschwingungen electric power, may accordingly have a (instantaneous) resonant frequency of the Nutzmodes, thus the useful frequency corresponding signal frequency.
- the exciter signal e can simultaneously also have a multiplicity of sinusoidal signal components with signal frequency different from one another, of which one - for example one at least temporarily with regard to a signal power
- the exciter arrangement E is set up to be driven by the exciter signal e to stimulate or maintain mechanical vibrations of the at least one tube 11.
- the at least one vibration exciter converts an electrical exciter power fed in by means of the electrical exciter signal into, for example, pulsating or harmonic, namely substantially sinusoidal, excitation forces which act on the tube accordingly and thus actively excite the desired useful oscillations.
- the - by conversion of fed into the vibration exciter electrical excitation power finally generated - excitation forces can thereby in the expert and in itself known manner, namely by means provided in the measuring and operating electronics ME, the exciter signal based on signal frequency and signal amplitude of at least a sensor signal on and via an output channel providing driver circuit are generated accordingly.
- a digital phase-locked loop PLL
- a current magnitude of the exciter signal determining an amount of identical exciter forces, for example by means of a corresponding current regulator of the driver circuit can be adjusted appropriately.
- the measuring device electronics ME can be configured here, for example, to regulate the exciter signal in such a way that the useful oscillations have a constant, thus also of the density p or the viscosity ⁇ of each medium to be measured largely independent amplitude.
- To generate the aforementioned excitation signal can - as in such measurement and operating electronics quite common or as indicated in Fig. 2 - in the measuring and
- Operation electronics ME also a corresponding, for example, designed as an independent electronics module, driver circuit Exc can be provided.
- driver circuit Exc The construction and use of the aforementioned phase-locked loops to actively excite vibrating elements of the type in question at a momentary resonance frequency is e.g. in US-A 48 01 897 described in detail.
- phase-locked loops to actively excite vibrating elements of the type in question at a momentary resonance frequency is e.g. in US-A 48 01 897 described in detail.
- the measuring and operating electronics ME is also set up for this, the two
- a mass flow sequence X m namely a sequence of such temporally consecutive, each of the mass flow rate, m, of the fluid instantaneously representing the mass flow measurement values x m, i to generate.
- the measuring and operating electronics ME is in particular provided or set up to generate the aforementioned mass flow measured values x m , i so that at least for one
- Reference mass flow rate m re f namely a predetermined mass flow rate of a reference fluid flowing through the transducer, for example, a liquid or a gas
- Temperature difference ⁇ & between the two temperature measuring points are independent; this in particular in such a way that for at least one non-zero but nonetheless constant reference mass flow rate m re f determined in chronological succession
- the aforementioned reference mass flow rate m re f may, for example, during a
- (Wet) calibration of the measuring system with the reference fluid using a calibrated reference measuring system can be set, for example, before its delivery to a calibration system of the manufacturer and / or in addition, as u.a. Also shown in the aforementioned WO-A 02/097379, in installation position on site. For the above case, that the
- Reference fluid at a non-zero reference mass flow rate m re f is allowed to flow through the transducer device, the fluid flow may advantageously, not least for the purpose of establishing the aforementioned temperature difference, be formed laminar or can the reference fluid in an advantageous manner Reynolds number (Re) of less than 1000 are allowed to flow through the transducer device.
- Re Reynolds number
- the reference mass flow rate m re f may be, for example, a mass flow rate not exceeding 1 kg / h and / or kept constant.
- the reference mass flow rate m re f but also be zero, so that the determined mass flow measurements x m , i (x m , i - »Xm.ref -» Xm.zERo) a scale zero point of the measuring and Represent operating electronics ME.
- the reference fluid can be advantageously, not least for the purpose of establishment of above-mentioned temperature difference, for example, a gas or a liquid having a specific heat capacity c, re f act that more than
- the reference fluid may thus, for example, an oil, esp. Having a viscosity of more than 10 "2 Pa s (Pascal second) to be. A particularly pronounced
- Reference mass flow rate m re f as a function of an amount
- of the specified nominal size of the converter device given in Sl base unit for length (m meter) is less than
- reference fluid can also, for example, water or
- the measuring and operating electronics ME is adapted to the mass flow measured values x m , i based on the following, viz
- Reference mass flow rate m re fied mass flow rate measurement x m ref at least one polynomial function satisfies the corresponding condition.
- the same temperature difference coefficients Kj can be determined experimentally beforehand for the respective measuring system, for example in the course of the aforementioned (wet) calibration of the measuring system by measuring the respective measuring system at different temperature differences and / or different (reference) mass flow rates and / or by computer-based simulations be, for example by adaptation of the polynomial function or their
- Transducer types can satisfy the first to transmit for a single transducer device experimentally determined temperature difference coefficient Kj the polynomial function on other identical transducer devices, so that the same identical
- Transducer devices associated with a considerable reduction in the calibration effort with respect to the polynomial function no longer need to be re-measured.
- Operating electronics ME further adapted, using both the Temperaturmeßsignals ⁇ 1 and the Temperaturmeßsignals ⁇ 2 a temperature difference sequence X A s, i, namely a sequence of temporally successive, each representing the temperature difference ⁇ & temperature difference.
- Generate measured values x A s, i, and / or the measuring and operating electronics ME is set up, using both the oscillation signal s1 and the oscillation signal s2 in the person skilled in the art and known per se, a phase difference sequence ⁇ ⁇ , ⁇ , namely a sequence of temporally successive, each phase difference ⁇ representing (conventional) phase difference measured values ⁇ ⁇ , ⁇ to generate.
- a phase difference sequence ⁇ ⁇ , ⁇ namely a sequence of temporally successive, each phase difference ⁇ representing (conventional) phase difference measured values ⁇ ⁇ , ⁇ to generate.
- the calculation of the respective (current) temperature difference measured value may be e.g. be done in such a way that by means of the measuring and operating electronics ME at intervals both on the basis of the Temperaturmeßsignals ⁇ 1 a Meßstellenentemperatur 01 representing the first Meßstellentemperatur measured value as well as on the basis of the Temperaturmeßsignals ⁇ 2 a
- Measuring point temperature 02 representing the second measuring point temperature measured value are generated, and that n salvageer temperature difference measured value x A s a simple numerical
- measuring and operating electronics ME may also be arranged to use the temperature difference sequence X A s, i a functionality of
- measuring and operating electronics ME measuring and operating electronics be diagnosed using the temperature difference sequence X A s, i, whether or that the tubes 1 1 or the transducer device formed therewith has a flow resistance that is changed from an original flow resistance or by using the temperature difference sequence X A s, i possibly also to generate an alarm that signals only a limited functionality of the converter device, for example, namely due to the aforementioned changed flow resistance of the pipe 11th
- the measuring and operating electronics ME is according to a further embodiment of the invention further adapted to generate (using the temperature measurement signal ⁇ 1 as well as the temperature measuring signal ⁇ 2 (recurring)) a transducer temperature measured value X®, which represents a transducer temperature OMW, both from the measuring point temperature 01 as well as the measuring point temperature 02, but also from the aforementioned temperature difference .DELTA.0 deviates, such that an amount n beauen
- Transducer temperature reading X ⁇ a - for example, according to the formula:
- the calculation of the transducer temperature measurement value X ⁇ may be e.g. be done in such a way that first by means of both the temperature measuring signal ⁇ 1 a the measuring point temperature 01
- Measuring point temperature measured value X2 are generated, and that the same
- Transducer temperature measured value according to one of the measuring point temperature measured values Xi, X2 as well as previously determined and stored in the measuring and operating electronics ME numerical fixed values ⁇ , ß dependent calculation rule:
- Transducer are fine-tuned - that thereby finally determined
- the measuring and operating electronics ME is also adapted to determine based on the two Temperaturmeßsignalen ⁇ 1, ⁇ 2 occasionally also a Meßfluidtemperatur measured value xs, the same Meßfluidtemperatur u represents.
- the measured fluid temperature reading xs may be e.g. in a very simple manner using a computation rule supplemented by one of the above-described calculation rules (5), (6) by only one, for example fixed, coefficient KFL.
- the measuring and operating electronics ME is further adapted, using the temperature measuring ⁇ 1, but not the
- Transducer temperature represents at least approximately. This can for example, even in the event that exactly one of the two temperature sensors 71, 72 is defective and / or separated from the measuring and operating electronics ME, such as breakage of one of the aforementioned connecting lines, nevertheless a measured value for transducer temperature determined and instead of Wandlertemperatur- Measured value X ⁇ , MW can be output as substitute. Moreover, the measuring and operating electronics ME can also be set up for this, using the temperature measuring signal ⁇ 1, but not the temperature measuring signal ⁇ 2 or using the temperature measuring signal ⁇ 2, but not the temperature measuring signal ⁇ 1 a (further) auxiliary temperature measured value X ⁇ , FL * To generate the
- Measuring fluid temperature at least approximately represented, as well as the same
- Auxiliary temperature measurement value X ⁇ , FL * may be substituted instead of the measured fluid temperature measured value X ⁇ , FL.
- the measuring and operating electronics ME can also be set up for the aforementioned defect of one of the temperature sensors 71, 72 or the aforementioned separation of one of the temperature sensors 71, 72 of the measuring and
- Operating electronics ME to detect and possibly to report, for example in the form of a
- the measuring system can furthermore be designed to measure a density and / or a viscosity of the medium, for example based on a useful signal component of at least one of the vibration signals and / or based on the excitation signal.
- the measuring and operating electronics ME according to a further embodiment of the invention is further configured, using at least one of the oscillation signal s1, s2
- User frequency represents. As useful frequency can - as already mentioned and as in vibronic measurement systems of the type in question quite common - one of the fluid-carrying tubes each inherent resonant frequencies be selected, for example, a
- N termeer generated by the Frequenzmeßwerts Xf measured value can, for example, the density p of the fluid FL1 representing density measured value x p and / or the viscosity ⁇ of the fluid FL1 representing viscosity measured value ⁇ be ⁇ .
- the measuring and operating electronics ME is according to a further embodiment of the invention further adapted to the at least one density measured value X P and / or the least one
- Viscosity measurement ⁇ ⁇ using both the generated by means of the converter device Temperaturmeßsignals ⁇ 1 and at least the generated by means of the wall ler leveraged to generate.
- the converter device can also be used in operation, for example, the same as for the above-described useful excursions,
- the converter device is equipped with at least one lumen 12 'having a lumen 12' enveloped by a wall, for example curved at least in sections and / or at least sectionally straight second tube 12.
- the same tube 12 extends, such as i.a. Also indicated in Fig. 2, from an inlet-side first end 12a to an outlet-side second end 12b.
- the tube 12 may - as shown in FIGS.
- the same tube 12 is further provided or adapted to be flowed through at least by a partial volume of the fluid FL1, starting from the end 12a in the direction of the end 12b and to be vibrated during this; this in particular in such a way that each of the - for example identical - pipes 1 1, 12 is vibrated simultaneously and / or gegentician same.
- the at least two tubes 1 1, 12 may, for example, to form serial
- the converter device further comprises an inlet-side first flow divider 20i and an outlet-side second flow divider 2O2, wherein both the second tube 1 1 and the tube 12 to form fluidically parallel flow paths to the, for example, identical flow divider 20i , 2O2 are connected, such that the tube 1 1 with the end 11 a in a first
- Flow opening 2O2A of the flow divider 2O2 opens, and that the tube 12 with the
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Abstract
Description
Claims
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DE102016015657 | 2016-12-29 | ||
DE102017106211.4A DE102017106211A1 (de) | 2016-12-29 | 2017-03-22 | Vibronisches Meßsystem zum Messen einer Massendurchflußrate |
PCT/EP2017/080095 WO2018121930A1 (de) | 2016-12-29 | 2017-11-22 | VIBRONISCHES MEßSYSTEM ZUM MESSEN EINER MASSENDURCHFLUßRATE |
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US (1) | US11125596B2 (de) |
EP (1) | EP3563122A1 (de) |
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CN110114642B (zh) * | 2016-12-29 | 2021-06-08 | 恩德斯+豪斯流量技术股份有限公司 | 用于测量质量流率的电子振动测量系统 |
-
2017
- 2017-11-22 US US16/474,719 patent/US11125596B2/en active Active
- 2017-11-22 CN CN201780080694.6A patent/CN110114641B/zh active Active
- 2017-11-22 EP EP17816482.8A patent/EP3563122A1/de active Pending
- 2017-11-22 WO PCT/EP2017/080095 patent/WO2018121930A1/de unknown
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US20200124452A1 (en) | 2020-04-23 |
CN110114641B (zh) | 2021-08-03 |
US11125596B2 (en) | 2021-09-21 |
WO2018121930A1 (de) | 2018-07-05 |
CN110114641A (zh) | 2019-08-09 |
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