RU2344376C1 - Method and device for compensating coriolis flow meter - Google Patents

Abstract

FIELD: physics; measurement.

SUBSTANCE: present invention provides for temperature compensation of mass flow values of a Coriolis flow meter. Temperature compensation of output signals of the flow meter is carried out by using exciting frequency F as an indicator of temperature changes of the flow tube and does not require use of temperature sensors. Compensation is carried out in the electronic measuring circuit of the Coriolis flow meter. The calibration factor of the stream as well as the nominal delay time, usually called "zero" in this field, are compensated. The Coriolis flow meter should be zeroed only once for the whole life time, after installation.

EFFECT: increased accuracy of measuring mass flow.

27 cl, 15 dwg

Description

FIELD OF THE INVENTION

The present invention relates to a compensation method and apparatus for a Coriolis flowmeter.

State of the art

It is known to use mass flow meters using the Coriolis effect to measure mass flow and obtain other information about materials flowing through a pipeline, as described in US Patent Nos. 4,491,025 to JESmith et al., January 1, 1985, and Re . 31450 J.E.Smith February 11, 1982 Coriolis flowmeters have one or more flow tubes, each of which has a set of modes of natural vibrations, which can be simple mode modes of bending vibrations, torsion vibrations, or torsional vibrations. In each of the flow tubes filled with material, oscillations are excited at the resonance frequency on one of these modes of natural vibrations. The modes of natural vibrations are partially determined by the combined mass of the flow tubes and the material located in these flow tubes. Material flows into the flowmeter from a connected pipeline on the inlet side. The material is then sent through a flow tube or flow tubes and transferred to a pipe connected to the side of the outlet.

The pathogen exerts a force to excite vibrations in the flow tube. When there is no flow through the Coriolis flowmeter, all points along the flow tube oscillate with an identical phase. When the flow of material begins, Coriolis accelerations create a different phase at each point along the flow tube relative to other points along the flow tube. The phase on the inlet side of the flow tube is late relative to the pathogen; the phase on the outlet side is ahead of the pathogen. Measuring sensors in the flow tube generate sinusoidal signals representing movement in the flow tube. The phase difference between the two sensor signals is proportional to the mass flow rate of the material flowing through the flow tube or flow tubes.

The use of Coriolis flowmeters having a different configuration of a flow tube is known. Among these configurations, one tube, two tubes, a straight tube, a curved tube, and flow tubes with a heterogeneous configuration are used. Most Coriolis flowmeters are made of metal such as aluminum, steel, stainless steel, and titanium. Glass flow tubes are also known. Most Coriolis direct sequential flow meters are currently made in the art from metal, in particular titanium.

It is known that a change in operating factors can affect the characteristics of a Coriolis flowmeter. These factors can be internal effects, such as the drift of the characteristics of the electronic components used in the transmitter of the Coriolis meter, or they can be external effects, such as fluctuations in line pressure, density, viscosity, or changes in ambient temperature and the frequency of excitation of the Coriolis meter. For the most part, prior art has paid attention to compensating for these changes by updating or modifying the circuits or by making adjustments to the flow calibration factor. Examples of these methods are presented in US Pat. No. 5,231,884 to Zolock and US Patent Application No. 09/343836 to Van Cleve et al.

Coriolis flowmeters can operate under controlled conditions in which constant pressure, density and viscosity are maintained to eliminate complex compensation for fluctuations in these parameters. However, this approach is not always feasible in practice, since it is often difficult to prevent fluctuations in the temperature of the material being processed or the environment in which the Coriolis flowmeter operates. When pressure, density, and viscosity can be kept constant, temperature compensation of the Coriolis meter can be done using temperature sensors (commonly called RTDs) installed in one or more sections of the Coriolis meter. The RTT measures the operating temperature in the meter on which it is installed.RTD information and information on the excitation frequency are fed into an electronic measuring circuit that generates an output value of mass p gathering with temperature compensation. The signals recorded with a flow tube, represent an uncompensated mass flow rate signal which is fed to an electronic measuring circuit which modifies the uncompensated mass flow rate of the received signal to obtain an output mass flow rate signal compensated by the excitation frequency.

There are disadvantages associated with the use of RTD temperature sensors for temperature compensation. The first disadvantage is that the temperature sensor cannot be attached to the vibration section of the flow tube, since the added weight of the sensor can change the vibration characteristics of the flow tube and reduce the accuracy of the output signal. The temperature sensor must therefore be fixed elsewhere in the Coriolis flowmeter or in the input or output line of the Coriolis flowmeter. In this regard, the temperature sensor cannot be used to directly measure the temperature of the processed material in the vibrating section of the flow tube. Since accurate temperature compensation requires measuring the temperature of the material within the active portion of the flow tube, the use of other installation locations, such as the inlet or outlet line of the flowmeter, results in a different temperature instead of the desired temperature. As a result, inaccuracies arise in the compensated mass flow output signal generated by the electronic measurement circuit.

A second disadvantage of using temperature sensors is that since they are not installed in the active portion of the vibrating flow tube, there is inevitably a time difference between the time when the temperature sensor detects a temperature change and the time when the temperature of the material in the flow tube changes. This time difference leads to additional inaccuracies in the compensated mass flow output signal generated by the flow meter.

The prior art includes US Pat. different vibration frequencies, and the method of its use to compensate for the compressibility effect of the fluid. In one embodiment, a Coriolis mass flow meter includes (1) a flow measurement circuitry connected to a flow tube that measures a first specific mass flow rate of a fluid flowing through a flow tube at a first oscillation frequency and a second specific mass flow rate of a fluid at a second frequency oscillations, and (2) a fluid compressibility compensation circuit connected to a specific mass flow measurement circuit in which the first and second specific mass flow values are used to determining the frequency response of the fluid; and adjusting to compensate for the compressibility of the fluid by the frequency response.

The prior art includes WO 00/71979 entitled “Vibrating Tube Meter”, which discloses that in a vibrating tube meter such as a Coriolis meter, an accurate measurement of a fluid parameter, such as density, can be obtained essentially independently of the voltage by measuring the characteristics of the vibration, in particular, the resonant frequency of two different vibration modes. Voltage or other variables can be determined from the measurement results. Since voltage measurements or compensation are based directly on the characteristics of the oscillations, higher accuracy can be obtained than using a conventional strain gauge sensor to measure voltage. The disclosed techniques provide accurate results without specific limitations on the design of the meter.

The prior art includes document EP 0701107 A entitled “Vibration measuring instrument”, which discloses the accuracy of the phase difference obtained by the phase difference calculation module, which is improved by correcting the throughput of the frequency ratio calculation module and the temperature calculation module, considering that the phase or time difference of each output of a vibration sensor, indicating mass flow or fluid density, is a function of temperature and axial force, applied which is relative to the measuring tube, or that the axial force is a function of the relationship between the two resonant frequencies.

SUMMARY OF THE INVENTION

The present invention solves the above and other problems and improves in the art by developing a method and apparatus for temperature compensation of Coriolis flow meters that eliminate the use of temperature sensors. The method and device in accordance with the present invention monitor the excitation frequency of the flow tube to provide temperature compensation. The Coriolis flowmeter operates in an environment in which all parameters except temperature affecting the frequency of the flow tube are kept constant. These factors include parameters such as stiffness or sensitivity of the calibration factor, all of which can affect the excitation frequency. Other such parameters include material density, viscosity, and pressure. In such controlled conditions, a change in the vibration frequency should occur as a result of changes in temperature, which changes the Young's modulus and the rigidity of the vibrating flow tube.

A Coriolis flowmeter developed in accordance with a preferred embodiment of the present invention has advantages in the field of compensation. The present invention not only compensates for the calibration of the flow, but also adjusts the nominal time delay Δt ₀ , commonly referred to in the art as “zero”. This means that after the Coriolis flowmeter is connected to the process for calibration or for actual use in the process, it needs to be reset only once after installation. This represents a significant improvement over Coriolis flowmeters that need to be reset to zero after minor changes in pressure or temperature.

.During meter calibration, the effect of temperature on the flow tube is characterized by tracking frequency and temperature changes, since the material flow and the actual temperature change. The calibration constants used to compensate for the flow are then determined and stored in an electronic measurement circuit. During operation, material flow and vibration frequency are monitored using a flow tube. The resulting temperature changes and frequency information from the meter are transferred to an electronic measuring circuit that uses the stored calibration constants to calculate the temperature-compensated mass flow

.

Using the frequency of the flow tube to obtain a temperature-compensated mass flow is preferable to using temperature sensors since frequency changes are detected to produce changes in the compensated mass flow signal directly when detecting frequency changes. An instantaneous change in the frequency in the flow tube is transmitted to an electronic measuring circuit that generates a corrected, compensated mass flow signal with increased accuracy, corresponding to a change in the temperature of the flow tube.

One aspect of the invention includes a method of providing temperature compensation for a Coriolis flow meter having at least one flow tube; wherein said method comprises the following steps:

generating a first signal representing Coriolis deviations of said flow tube;

generating a second signal representing the characteristics of said flowmeter, wherein said characteristics include an excitation frequency F of said Coriolis flowmeter, as well as an induced time delay Δt;

characterized by the presence of an electronic measuring circuit for using the specified first and specified second signals to provide temperature compensation for the specified output signals of the specified Coriolis flowmeter.

Preferably, the method further comprises said step of providing temperature compensation, comprising the steps of:

receiving a calibrated mass flow value from a reference Coriolis flow meter,

using said first and said second signals and said calibrated mass flow rate value to provide said temperature compensation for said Coriolis flowmeter.

Preferably, the method further comprises said step of providing temperature compensation, which includes the following steps:

using said first and said second signals and said calibrated mass flow rate value to obtain calibration constants for said Coriolis flowmeter; and

using said calibration constants to provide said temperature compensation for said Coriolis flowmeter.

Preferably, the method further comprises an additional step of determining a temperature compensated mass flow rate for said Coriolis flowmeter in response to said generation of said first and second signals and said providing temperature compensation for said Coriolis flowmeter.

Preferably, the method further comprises the following steps:

receiving a third signal representing the calibration constants of said Coriolis flowmeter; and

using said first and said second, and said third signals, and said calibration constants to determine a temperature compensated flow rate for said Coriolis flowmeter.

Preferably, the method further comprises additional steps:

determining an excitation frequency F from said second signal;

obtaining a calibration constant α _F linear frequency for zero; and

using said excitation frequency F and said linear frequency calibration constant α _F for zero to obtain the temperature-compensated mass flow rate.

Preferably, the method further comprises a compensated mass flow rate comprising the following steps:

для потока; иobtaining coefficient

for flow; and

для потока для получения компенсированного по температуре значения массового расхода.using the specified excitation frequency F and the specified calibration constant α _{F of the} linear excitation frequency for zero, and the specified constant

for a flow to obtain a temperature-compensated mass flow rate.

Preferably, the method further comprises additional steps:

линейной частоты (температуры) для потока; иget constants

linear frequency (temperature) for the flow; and

для потока, и указанной константы

линейной частоты (температуры) для потока для получения компенсированного по температуре значения массового расхода.using the specified excitation frequency F and the specified calibration constant α _{F of the} linear excitation frequency for zero and the specified constant

for the stream, and the specified constant

linear frequency (temperature) for the flow to obtain a temperature-compensated mass flow rate.

Preferably, the method further comprises said step of obtaining said calibration constants and comprises the following steps:

массового расхода из эталонного Кориолисова расходомера; иreceiving value

mass flow from a Coriolis reference flow meter; and

массового расхода и указанного второго сигнала для получения указанных калибровочных констант указанного Кориолисова расходомера.using the specified value

mass flow rate and said second signal to obtain said calibration constants of said Coriolis flowmeter.

Preferably, the method further comprises said step of generating said calibration constants, and comprises the following steps:

receiving said second signal to obtain a flow-induced delay Δt of the time and said frequency Coriolis excitation of the flow meter; and

using said first signal and said stream-delayed delay Δt time and said excitation frequency F to obtain said calibration constants of said Coriolis flowmeter.

Preferably, the method further comprises said step of generating said calibration constants, comprising additional steps:

obtaining a constant α _{F of the} linear excitation frequency for a nominal time delay Δt ₀ ; and

using the specified excitation frequency F and the indicated constant α _{F of the} linear excitation frequency for the specified nominal time delay Δt ₀ to obtain the specified calibration constants.

Preferably, the method further comprises said calibration constants:

,

Δt ₀ , α _F ,

,

Preferably, the method further comprises said step of obtaining said calibration constants and includes the step of solving the expression:

Where

Δt is the flow delay delay

Δt ₀ - nominal time delay,

- массовый расход,

- mass flow rate

F is the excitation frequency,

F ₀ - excitation frequency for the nominal zero flow,

α _F is the linear frequency constant for zero,

- константа, связанная с FCF (ККП, коэффициент калибровки потока),

- constant associated with FCF (KKP, coefficient calibration flow),

- константа линейной частоты (температуры).

is the constant of the linear frequency (temperature).

Preferably, the method further comprises said step of determining said temperature compensated mass flow rate and comprises the step of solving the expression:

Where

Δt is the flow-induced delay time delay,

Δt ₀ - nominal time delay,

- массовый расход,

- mass flow rate

F is the excitation frequency,

F ₀ - zero excitation frequency,

α _F is the linear frequency constant for zero,

- константа, связанная с ККП,

- constant associated with the CCP,

- константа линейной ККП частоты (температуры).

is the constant of linear CCP frequency (temperature).

Another aspect of the present invention comprises an apparatus that provides temperature compensation for a Coriolis flowmeter having at least one flow tube; and the specified device contains:

a device that generates a first signal representing a Coriolis deviation for the specified flow tube;

a device that generates a second signal representing the characteristics of said flowmeter, wherein said characteristics include an excitation frequency F of said Coriolis flowmeter, as well as an induced time delay Δt;

characterized by the presence of an electronic measuring circuit in which the specified first and specified second signals are used to provide temperature compensation of the output signals of the specified Coriolis flowmeter.

Preferably, said device that provides temperature compensation includes:

a device that receives a calibrated mass flow value from a Coriolis reference flow meter, and

a device in which said first and said second signals and said calibrated mass flow rate value are used to provide said temperature compensation for said Coriolis flowmeter.

Preferably, said device, which provides said temperature compensation, further includes:

a device in which said first and said second signals and said calibrated mass flow rate value are used to provide calibration constants for said Coriolis flow meter; and

a device in which said calibration constants, and said first and said second signals, and said calibrated mass flow rate value are used to provide said temperature compensation for said Coriolis flowmeter.

Preferably, a device that determines a temperature-compensated mass flow rate for said Coriolis flowmeter in response to said generation of said first and second signals and said providing temperature compensation for said Coriolis flowmeter.

Preferably, a device that receives a third signal representing the calibration constants of said Coriolis flowmeter; and

a device in which said first and said second, and said third signals, and said calibration constants are used to determine a temperature compensated mass flow rate for said Coriolis flowmeter.

Preferably, a device that determines an excitation frequency F from said second signal;

a device that receives the constant α _F calibration linear frequency for zero;

для потока;device that receives the coefficient

for flow;

линейной частоты (температуры) для потока; иdevice that gets a constant

linear frequency (temperature) for the flow; and

для потока, и указанная константа

линейной частоты (температуры) для потока используются для получения компенсированного по температуре значения массового расхода.a device in which the specified excitation frequency F and the specified constant α _F linear frequency of the excitation for zero, and the specified constant

for the stream, and the specified constant

linear frequency (temperature) for the flow are used to obtain a temperature-compensated mass flow rate.

Preferably, said device that receives said calibration constants comprises:

массового расхода из эталонного Кориолисова расходомера;device that takes value

mass flow from a Coriolis reference flow meter;

a device that receives the specified second signal to obtain the flow-induced delay Δt time and the specified frequency F of the excitation of the Coriolis flowmeter;

a device that receives a constant α _{F of the} linear excitation frequency for a nominal time delay Δt ₀ ; and

массового расхода используются для получения указанных калибровочных констант.a device in which the specified excitation frequency F, and the specified constant α _F linear excitation frequency for the specified nominal delay Δt ₀ time, and the specified value

mass flow rates are used to obtain the indicated calibration constants.

Preferably, said calibration constants are:

,

.Δt ₀ , α _F ,

,

.

Preferably, said device that obtains said calibration constants includes a device that solves the expression:

Where

Δt is the flow delay delay

Δt ₀ - nominal time delay,

- массовый расход,

- mass flow rate

F is the excitation frequency,

F ₀ - excitation frequency for the nominal zero flow,

α _F is the linear frequency constant for zero,

- константа, связанная с ККП,

- constant associated with the CCP,

- константа линейной частоты (температуры).

is the constant of the linear frequency (temperature).

Preferably the specified device, which receives the specified temperature-compensated mass flow rate, solves the following expression:

Where

Δt is the flow-induced delay time delay,

Δt ₀ - nominal time delay,

- массовый расход,

- mass flow rate

F is the excitation frequency,

F ₀ - zero excitation frequency,

α _F is the linear frequency constant for zero,

- константа, связанная с ККП,

- constant associated with the CCP,

- константа линейной ККП частоты (температуры).

is the constant of linear CCP frequency (temperature).

Brief Description of the Drawings

These and other advantages and features of the present invention will be better understood by reading the following detailed description in conjunction with the accompanying drawings.

1 is a perspective view of a first example of a Coriolis flowmeter in accordance with an embodiment of the present invention.

Figure 2 shows a top view of the embodiment of figure 1.

Figure 3 shows a front view of the embodiment of figure 1.

Figure 4 shows a sectional view along the line 4-4 indicated in figure 2.

Figure 5 shows a graph representing the relationship between the excitation frequency and the temperature of the flow tube.

Figure 6 shows a graph representing the relationship between the frequency of excitation and the density of the material.

7 to 9 are graphs representing data collection during calibration.

.Figure 10-11 shows a flowchart of a method used to calibrate a Coriolis flowmeter and to determine mass flow

.

12 illustrates the preparation of calibration constants.

On Fig and 14 presents illustrations of comparative values of the accuracy of the use of frequency changes in comparison with the RTD to obtain temperature compensation.

On Fig additionally presents the electronic measuring circuit 121 of figure 1.

DETAILED DESCRIPTION OF THE INVENTION

Legend

KKP - coefficient calibration flow in accordance with the prior art;

α is the temperature coefficient of the CCC of the prior art;

Δt is the flow delay delay;

Δt ₀ - nominal time delay at zero flow;

- массовый расход;

- mass flow rate;

F is the operating excitation frequency;

F ₀ is the nominal excitation frequency (under normal temperature conditions) selected by the manufacturer;

ZERO (F) is a term describing the effect of frequency on the nominal time delay Δt ₀ . Equal to Δt ₀ + (FF ₀ ) α _F ;

α _F is the linear frequency constant for zero;

- коэффициент пропорциональности, сопоставляющий Δt с массовым расходом. Аналогичен ККП в предшествующем уровне техники.

- proportionality coefficient comparing Δt with mass flow rate. Similar to CCP in the prior art.

константа линейной частоты (температуры) для

Аналогична α в предшествующем уровне техники;

linear frequency (temperature) constant for

Similar to α in the prior art;

FMUT - test flowmeter (IRM).

Description of FIG. 1

1 shows a perspective view of a first possible exemplary embodiment of a Coriolis flowmeter in accordance with an embodiment of the invention. Here, a flow meter 100 is shown having a flow tube 102 that is passed through the struts 117, 118 of the base 101. The sensors LP0 and RP0, as well as the pathogen D, are connected to the flow tube 102. The processed material enters the flow meter 100 through the feed tube 104, after which the flow enters through the processing connector 108 into the flow tube 102. Vibration is excited in the tube 102 at the frequency of its own resonance, while the material flows through it, using the pathogen D. The resulting Coriolis deviations detected by sensors LP0 and RP0, which transmit signals through conductors 112 and 114 to Coriolis electronic measurement circuit 121. The Coriolis electronic measuring circuit 121 receives sensor signals, determines the phase difference between them, determines the vibration frequency and transmits output information related to the material flow through the output circuit 122 to a circuit for using this information (not shown). The electronic measuring circuit 121 is shown in more detail in FIG.

The flow of material flows through the flow tube 102 and through the tube 106, which directs the flow of material back through the return tube 103, through the processing connector 107, to the output tube 105, through which the flow of material is supplied for use by the user.

Processing connectors 107, 108, 109 and 110 connect the tubes 104, 105 and 106 to the ends of the flow tube 102 and the return tube. The processing connectors have a fixed portion 111 on which a thread 124 is formed. Fixation screws 411 are installed in the fixing holes 130 to firmly connect the member 111 to the base 101, as shown in FIG. 4. The movable portions of the processing connectors 107-110 are screwed onto the external thread 124 to connect their respective tubes to the stationary housing of the processing connectors, on the part of which a hex nut section 111 is formed. Such processing connectors work similarly to the well-known processing connectors for flared copper tubes for connecting the tubes 104, 105 and 106 to the ends of the flow tube 102 and the return tube 103. The processing connectors are further shown in detail in FIG. 4.

Description of FIG. 2

Figure 2 shows a top view of the flow meter 100 of figure 1. Each of the sensors LP0 and RP0, as well as the exciter D, includes a coil C. Each of these elements further includes a magnet, which is fixed to the lower portion of the flow tube 102, as shown in FIG. 3. Each of these elements additionally includes a base, such as 143 for the pathogen D, as well as a thin strip of material, such as 133 for the pathogen D. A thin strip of material may contain a printed circuit board on which the coil C and the terminals of its winding are fixed. The LP0 and RP0 sensors also have a corresponding base element and a thin strip fixed to the top of this base element. This arrangement allows the installation of the pathogen or sensors in accordance with the steps of gluing the magnet M to the underside of the flow tube, gluing the coil C to the printed circuit board 133 (for the pathogen D), installing the hole of the coil C around the magnet M, moving the coil C up so that the magnet M is completely located inside the opening of the coil C, the subsequent installation of the base element 143 under the printed circuit board 133 and gluing these elements together, as a result of which the lower part of the base 143 is fixed with glue and the surface of the massive base 116.

The external thread 124 of the processing connectors 107-110 is shown in FIG. The internal details of each of these elements are shown in FIG. Conductors 112, 113, and 114 are laid in hole 132. The Coriolis flowmeter electronic measurement circuit 121 of FIG. 1 is not shown in FIG. 2 to simplify the drawing. However, it should be understood that the conductors 112, 113, and 114 extend through the opening 132 and then continue along the circuit 123 shown in FIG. 1 to the electronic Coriolis flowmeter measuring circuit shown in FIG. 1.

Description of FIGS. 3 and 4

Figure 3 shows the sensors LP0, RP0 and the pathogen D, which contains a magnet M, mounted on the lower portion of the flow tube 102, and a coil C, mounted on the basis of each of the elements LP0, RP0 and the pathogen D.

Figure 4 shows a sectional view along the line 4-4 indicated in figure 2. Figure 4 shows all the elements of figure 3 and the additional details of the connectors 108 and 109, as well as the ring gaskets 430. The ring gaskets 430 connect the flow tube 102 to the base 401. Figure 4 additionally presents the holes 402, 403 and 404 in the base 101. The upper part of each of these holes extends to the lower surface of the base of the sensors LP0, RP0 and pathogen D. Coil C and magnet M associated with each of these elements are also shown in FIG. 4. The electronic measurement circuit 121 of the Coriolis flowmeter of FIG. 1 is not shown in FIGS. 3 and 4 to simplify the drawings. Element 405 of processing connector 108 is an inlet of a flow tube 102; element 406 of the connector 109 processing is the outlet of the flow tube 102.

The fixed portion 111 of the processing connector 108 includes an external thread 409 that is screwed into a corresponding thread in a receiving hole 420 located at the base 401 to connect the fixed portion 111 to the segment 401 of the base 101. The fixed portion of the processing connector 109 is equipped and secured to the right likewise, using thread 409 in a receiving opening 420 formed in element 401 of base 101.

The fixed member 111 of the processing connector 108 further includes a threaded portion 124 on the thread of which a movable section 415 of the processing connector 108 is mounted. Processing connector 109 is similarly configured. The fixed member 111 of the processing connector 108 further includes, on its left side, a tapered portion 413, which together with the movable piece 415 acts as a flare fitting, for pressing the right end of the inlet tube 104 to the tapered portion 413 of the fixed portion 111. This creates a sealed fitting, which hermetically fastens the flared opening of the supply tube 104 to the conical portion 413 of the fixed portion 111 of the processing connector. The inlet of the flow tube 102 is mounted on a fixed portion 111 of the processing connector and flush with the surface 425 of the portion 413. Due to this, the processing material supplied through the supply pipe 104 enters the inlet 405 of the flow tube 102. The processing material flows to the right through the flow tube 102 to the fixed section 111 of the processing connector 109, where the outlet 406 of the flow tube 102 is connected flush with the surface 425 of the portion 413. As a result, the outlet of the flow tube 102 g rmetichno connected to connector 109. The other connectors 107 and 110 for processing 1 performed identically to those described in detail connectors 108 and 109 of Figure 4 processing.

General Description of Figures 5-12

пропорциональности, которая называется коэффициентом калибровки (ККП) в предшествующем уровне техники.In the present invention, temperature compensation of the output of the Coriolis flowmeter, representing the mass flow rate, is provided by using the excitation frequency as an indicator of temperature changes in the flow tube. Coriolis flowmeters measure mass flow directly by calculating the delay (Δt) of the time between the input and output ends of the active portion of the vibrating Coriolis flowmeter tube. The offset time delay at zero flow (Δt ₀ ) is measured and subtracted from the calculated time delay during the flow to obtain a value that is directly proportional to the mass flow using constant

proportionality, which is called the calibration coefficient (CCP) in the prior art.

The density of the fluid also affects the excitation frequency of the flow tube. To illustrate the sensitivity of frequency to temperature and density, the effect of density should be characterized and compared with the effect of temperature. The Coriolis flowmeter in accordance with the present invention can be used with suspensions having a limited specific gravity. When a frequency is used for temperature compensation, the effect of a change in fluid density should also be evaluated and determined to determine mass flow.

Flow tube materials respond to temperature changes. These changes should be considered to accurately calculate the mass flow rate. Traditionally, RTT temperature sensors are used to directly measure temperature. They are installed on the inactive surface of the Coriolis tube. This is usually done outside the clamp (s) of the mount. The Coriolis flowmeter described has one straight flow tube. There is no inactive section of the flow tube where a representative temperature measurement could be made for the flow tube using a temperature sensor mounted on the flow tube so that it does not affect the output accuracy.

In the present invention, the temperature change of the flow tube is detected by monitoring the frequency of excitation. The use of the excitation frequency in accordance with the present invention to determine temperature changes and compensate for the output value of the flow requires solving the following problems. In the prior art, the temperature is measured using an RTD temperature sensor mounted on a secondary or inactive portion of the flow tube, with which the temperature in the Coriolis flow tube is estimated.

The method and device in accordance with the present invention can improve the accuracy of determining the temperature, and also improve the response time of the meter when detecting temperature changes.

When using frequency as a means of detecting and compensating for temperature changes, the sequential expansion of Δt using the Taylor series isolates the influence of frequency and mass flow on Δt. This extension is transformed so that it looks like a flow equation, and a pseudo-inverse least squares problem is compiled. Assume that the time delay of the sensor Δt is a function of the mass flow rate and the excitation frequency.

This expression can be expanded around the operating point using the Taylor series:

Equation 1.2 is a complete extension and cannot be used for an infinite number of terms of a higher order. Optimal matching can be achieved using terms that linearly affect the zero flux and CFC depending on temperature, and terms that quadratically influence the zero flow and CFC depending on temperature. However, within the operating temperature range of the sensor (18-28 ° C) in accordance with the present invention, the behavior is linear enough to use only frequency terms that linearly affect the CCP and Δt ₀ . As a result of this, and when replacing the notation of partial derivatives, we obtain:

Now we rearrange the members, grouping the members associated with the zero thread and the members associated with the thread:

, тогда уравнение 1.4 можно перегруппировать так, что оно будет выглядеть, как уравнение потока:For convenience, we choose the nominal value

, then equation 1.4 can be rearranged so that it looks like the flow equation:

The prior art flow equation is:

Given the analogy between equations 1.5 and 1.6, we can see that the plot of equation 1.5 relative to "zero", as a function of frequency, is:

and a portion of equation 1.5 relating to the "flow calibration coefficient" as a function of frequency is:

If we rewrite Equation 1.4 in the form of a vector equation, the pseudo-inverse least-squares problem will be formulated:

Assuming that it is possible to record Δt and the excitation frequency of the Coriolis flowmeter, when registering the mass flow rate from a series-connected reference Coriolis flowmeter, we can solve the column vector in equation 1.4 by multiplying both sides by the pseudo-inverse value of the row vector:

Equation 1.10 is the equation that you want to use in the present invention to optimally characterize the temperature dependence of the sensor.

As indicated above, the excitation frequency has a linear temperature dependence. Accordingly, compensation for the effect of temperature on the flow using the excitation frequency is preferred.

Description of FIG. 5

Figure 5, lines 501 and 502 shows the relationship between the excitation frequency and temperature for the two sensors of the flow tube. The sensors of the flow tube were installed in a furnace, the temperature of which periodically varied from 15 to 35 ° C. A linear trend line was selected for each data set of lines 501 and 502, and the indicated operating range for the sensor is shown between the dashed lines 503 and 504. Using the slope of each trend line 501 and 502, we can obtain an estimate of the sensitivity of the excitation frequency, which is 14 Hz for the whole temperature fluctuation range.

Description of FIG. 6

Figure 6 shows graphs of the dependence of the excitation frequency on the specific gravity of the fluid for the same two sensors, represented by lines 601 and 602 trends. The sensors are designed to measure the flow rate of suspensions, the fluid density of which is from 1.0 to 1.3 SG (specific gravity, UP), as shown for trend lines 603 and 604. These fluids were used to cover the operating range of sensor densities. Three data points were obtained for each sensor, and a trend line was constructed from these data. Using the slope of each trend line, one can obtain an estimate of the sensitivity of the excitation frequency, which is 4 Hz over the range FS of the density change. This result looks significant, but it should be noted that each Coriolis flowmeter is installed in a specific process using a specific fluid in this range. In addition, after installation, users usually calibrate their process against the actual output value of the stream, receiving an error estimate when using the new processing fluid in the device.

Description of Figs. 7-12

уравнения 1.5 потока, используя процедуру калибровки в соответствии с настоящим изобретением. Эти калибровочные константы получают используя уравнение 1.10. После получения их используют в уравнении 1.5 потока вместе с измеряемыми значениями частоты F возбуждения и Δt (задержка времени, индуцированная потоком) для определения измеренного значения

массового расхода. Это подробно описано в следующих абзацах. Калибровочные константы Δt₀, α_F,

получают, используя четырехуровневую процедуру, которая описана ниже.With reference to Figs. 7-12, a method is described by which calibration constants Δt ₀ , α _F , are obtained,

flow equation 1.5 using the calibration procedure in accordance with the present invention. These calibration constants are obtained using equation 1.10. Once received, they are used in Equation 1.5 of the flow along with the measured values of the excitation frequency F and Δt (time delay induced by the flow) to determine the measured value

mass flow rate. This is described in detail in the following paragraphs. Calibration constants Δt ₀ , α _F ,

receive using the four-level procedure, which is described below.

The reference Coriolis flowmeter and Coriolis flowmeter for calibration are connected in series and a test flow is supplied. The flow data corresponding to the measurement cycles 1-4 in Table 1 below are used for calibration. The test matrix for identifying the mass flow rate of the reference test meter and the contribution of temperature / frequency to Δt is shown in Table 1. The measured mass flow rates for the Coriolis reference meter and the Coriolis meter tested in series are shown in FIG. 7.

Table 1 Measurement cycle Mass flow rate (g / min) Fluid temperature ° C one 350 28 2 fifty 28 3 350 eighteen four fifty eighteen

для эталонного Кориолисова расходомера. Линия 703 представляет массовый расход в эталонном Кориолисовом расходомере.The measured mass flow rates in the reference Coriolis flowmeter and the Coriolis flowmeter connected in series with it, obtained in the four measurement cycles shown in Table 1, are presented in Fig.7. Used the four measurement results shown in Fig.7, together with the corresponding values of temperature, excitation frequency and

for reference Coriolis flowmeter. Line 703 represents mass flow in a Coriolis reference flowmeter.

Линия 803 представляет скорость потока для эталонного Кориолисова расходомера.On Fig presents the data obtained for the four test measurements in Fig.7. This data profile is used, as described below in equation 1.10, to obtain the values of the calibration constants Δt ₀ , α _F ,

Line 803 represents the flow rate for a Coriolis reference flowmeter.

для каждого цикла измерений и линией 905 показана величина ошибки. Результаты обоих способов компенсации представлены линией 905, поскольку оба они соответствуют установившимся потокам. Эта точность представлена нулевой ошибкой для обоих способов на линии 905 для всех четыре тестовых измерений.Figure 9 shows the results of the simultaneous use of frequency and temperature compensation (RTD) for steady state flow. Both methods showed good agreement between Coriolis flowmeter calibration data under steady-state flow conditions. 9, line 901 shows the excitation frequency, line 902 shows the temperature, line 903 represents the mass flow rate

for each measurement cycle and line 905 shows the error value. The results of both compensation methods are represented by line 905, since both of them correspond to steady flows. This accuracy is represented by a zero error for both methods on line 905 for all four test measurements.

Electronic measuring circuit 121, shown in figures 1 and 15, performs the function of processing data to implement the operations presented in Fig.7-9.

Description of figures 10 and 11

,

калибровки. Полученные калибровочные константы выводят на фиг.11, где их используют для получения компенсированного по температуре значения

массового расхода.10 is a flowchart 1000 describing how calibration constants are obtained in the method and apparatus of the present invention. 10, a plurality of processing steps or program steps are disclosed, each of which is one or more program instructions stored in a memory 1502 of an electronic measurement circuitry 121 of a Coriolis flowmeter. These instructions are executed by the processor 1502 of the Coriolis flowmeter electronic measurement circuit 121, and the results are either stored in the memory 1501 of the electronic flowmeter measurement circuitry or output to the user through circuit 122. The process shown in FIG. 10 receives the constants Δt ₀ , α _F ,

,

calibration. The obtained calibration constants are displayed in Fig. 11, where they are used to obtain temperature-compensated values

mass flow rate.

массового расхода, от включенного последовательно эталонного расходомера. Элемент 1006 принимает обозначенную выше информацию от элементов 1004 и 1003 и использует ее для получения калибровочных констант Δt₀, α_F,

,

, решая уравнение 1.10.10, the signals LP0 and RP0 of FIG. 1 are transmitted to element 1002, which transmits them to element 1004, which uses the obtained information to determine the detected value Δt and the excitation frequency F of the tested flowmeter. Element 1006 receives signals from element 1003 representing the measured value

mass flow rate from a reference flow meter connected in series. Element 1006 receives the above information from elements 1004 and 1003 and uses it to obtain calibration constants Δt ₀ , α _F ,

,

solving equation 1.10.

и

получают из элемента 1104.The resulting calibration constants are passed from element 1006 to element 1106 in FIG. 11. Element 1102 receives sensor inputs from sensors LP0 and RP0 of FIG. 1 for the flowmeter under test. This information is passed to element 1104, which receives the Δt value and the excitation frequency F for the test flowmeter and transmits them to element 1106. Element 1106 receives the output values of elements 1104 and 1006 to obtain a temperature-compensated mass flow rate of the test flowmeter using equation 1.5, indicated by 1.5 in element 1106. The terms Δt and Δt ₀ are obtained using element 1006. The expression FF ₀ present in both the numerator and denominator of equation 1.5 is obtained using element 1106 from element 1104. Member α _{F is} obtained from by the help of element 1004. Members

and

receive from element 1104.

Element 1106 uses all of these terms on the right side of Equation 1.5 to obtain a temperature-compensated mass flow rate output to the user through output 122 of FIG. 1 of the electronic measurement circuit 121.

Description of FIG. 12

используя уравнение 1.10. Для получения калибровочных констант Δt₀, α_F,

испытуемого расходомера (ИРМ) требуются:On Fig presents a method in accordance with the present invention, which is used to obtain calibration constants Δt ₀ , α _F ,

using equation 1.10. To obtain the calibration constants Δt ₀ , α _F ,

test flowmeter (IRM) required:

- the results of the actual measurement of mass flow obtained from a series-connected reference flow meter, which is connected in series with the tested Coriolis flow meter,

- the measured temperature value from the IRM,

- measured values of the IRM frequency.

These measurements are performed while the IRM is subjected to the processing conditions shown in Table 1 below.

Table 1 Measurement cycle Mass flow rate (g / min) Fluid temperature ° C one 350 28 2 fifty 28 3 350 eighteen four fifty eighteen

The actual reference value of the mass flow rate and temperature of the fluid may differ from the ideal reference value of the mass flow rate and temperature of the fluid due to limitations on the ability to control the flow on the bench on which the IRM calibration is performed.

For each measurement cycle shown in Table 1, many measurements of the actual mass flow rate, the temperature of the IRM and the excitation frequency of the IRM are performed. Suppose:

M = number of measurements for the three above values during measurement cycle 1.

N = number of measurements for the three above values during measurement cycle 2.

O = number of measurements for the three above values during cycle 3 measurements.

P = number of measurements for the three above values during cycle 4 measurements.

, температура ИРМ и частота возбуждения ИРМ должны измеряться M+N+O+P раз для каждого параметра. Требуется, чтобы M+N+O+P равнялось, по меньшей мере, количеству параметров, решаемых с помощью Уравнения 1.10. Однако рекомендуется, чтобы сумма M+N+O+P была намного больше, чем количество решаемых параметров. Это представляет собой определение задачи наименьших квадратов, которую здесь пытаются решить.During the calibration measurements of FIG. 8, the reference mass flow rate

, IRM temperature and IRM excitation frequency should be measured M + N + O + P times for each parameter. It is required that M + N + O + P be equal to at least the number of parameters solved using Equation 1.10. However, it is recommended that the sum of M + N + O + P be much larger than the number of parameters to be solved. This is the definition of the least squares problem that they are trying to solve here.

To avoid confusion, suppose that M = N = 0 = P, as a result, the total number of measurements of the reference value of the mass flow rate, the temperature of the IRM and the frequency of the IRM is 4 times the value of M. The sizes of the calibration problem presented by Equation 1.10, with the parameters shown in the table 1 and shown in FIG. 8 are also shown in FIG. 12.

Они представляют собой требуемые калибровочные константы. Член Δt₀ представляет собой нулевое смещение ИРМ. Это значение получают при обнулении измерителя в традиционном смысле (то есть, в результате нажатия кнопки обнуления). Член α_F представляет собой влияние линейной частоты (следовательно, температуры) на нулевое смещение ИРМ. Член

представляет собой коэффициент калибровки потока (ККП) ИРМ.After the data of FIG. 8 has been obtained and equation 1.10 has been solved, four values are obtained, namely Δt ₀ , α _F ,

They represent the required calibration constants. The term Δt ₀ represents the zero displacement of the IRM. This value is obtained when the meter is zeroed in the traditional sense (that is, as a result of pressing the zeroing button). The α _{F term} represents the effect of linear frequency (hence temperature) on the zero offset of the IRM. Member

represents the coefficient of flow calibration (CCP) IRM.

представляет собой влияние линейной частоты (следовательно, температуры) на ККП ИРМ. Эти калибровочные константы теперь можно использовать в Уравнении 1.5 для расчета компенсированного по частоте (следовательно, по температуре) массового расхода ИРМ.Member

represents the influence of the linear frequency (therefore, temperature) on the CCM IRM. These calibration constants can now be used in Equation 1.5 to calculate the frequency-compensated (hence temperature) mass flow rate of the IRM.

The electronic measuring circuit 121 shown in FIGS. 1 and 15 performs the data processing required to perform the operations of FIG. 12.

Description of FIG. 13

13 shows the result of using frequency determination for temperature compensation compared to using RTD temperature sensors to track the frequency of the flow tube and temperature compensation. 13 clearly shows the advantage of frequency-based temperature compensation compared to using RTD. Line 1303 represents the mass flow rate obtained using a Coriolis reference flow meter. The solid line 1308 represents the results obtained using RTT sensors. Dotted line 1309 illustrates frequency tracking in accordance with the present invention.

Line 1303 represents the excitation frequency. Line 1302 represents the temperature. Line 1301 represents the resulting mass flow rate. In the straight sections of line 1303, the measurement results obtained by the reference meter using a solid-state drive and using frequency are superimposed on each other, and the results are deviated only in sections 1305, 1306 and 1307, which represent sudden changes in mass flow. Element 1305 comprises lines 1303, 1308, and 1309. Line 1303 represents the mass flow rate obtained with a reference meter. Line 1308 represents the RTT response. Line 1309 represents the response obtained using frequency tracking. You can see that the responses represented by lines 1303 and 1309 are essentially the same during the transition period represented by element 1305. Also, from the response 1308 of element 1305, it can be seen that the response of the RTD diverges significantly when comparing it with the response obtained from the reference measurement device. The same observation can be made with respect to elements 1306 and 1307, where the results obtained using the frequency compensation displayed by line 1309 more closely correspond to the response of the reference device displayed by line 1303 than the results displayed by line 1308 representing the results obtained using RTD temperature compensation.

массового расхода по фиг.13 соответствуют соответственно обозначенным элементам на фиг.7, 8 и 9.Values

the mass flow rate in Fig.13 correspond respectively to the designated elements in Fig.7, 8 and 9.

Based on the analysis of FIG. 13, it can be concluded that the use of frequency tracking for temperature compensation is much more preferable compared to the use of RTD, in the case when it is necessary to ensure accuracy in transient conditions of mass flow.

The electronic measuring circuit 121 shown in FIGS. 1 and 15 performs the data processing required to perform the operations shown in FIG. 13.

Description of FIG. 14

With reference to FIG. 14, a comparison of the accuracy of the response when using frequency tracking is compared with using the RTD. Line 1401 represents the excitation frequency, line 1402 represents the temperature, and line 1403 represents the mass flow rate. Line 1414 represents the compensation error obtained by using frequency tracking compared to using RTD. As can be seen, when using an RTD compared to frequency tracking, comparable results are obtained when the mass flow rate is substantially constant. However, elements 1405, 1406, and 1407 denote states in which transients of mass flow occur. As shown for element 1405, the response when using frequency tracking 1415 more closely matches the mass flow rate 1414 measured by the reference device than the RTT response 1405.

The electronic measuring circuit 121 shown in FIGS. 1 and 15 performs the data processing required to perform the operations shown in FIG. 14.

Description of FIG. 15

As shown in FIG. 15, the electronic measurement circuit 121 includes a processor 1501 and a storage device 1502.

The processor 1501 may comprise a conventional CPU. Alternatively, it may comprise a specialized or general purpose processor, or a DSP (DSP, digital signal processor). The storage device 1502 may include any type of memory system, such as a flash storage device or conventional ROM and RAM, designed to store information both for a long time and for a short time.

An electronic measurement circuit 121 receives input on circuit 123 and transmits output on circuit 122 to the user. The electronic measuring circuit 121 receives input signals on a circuit 123 from sensors LP0 and RP0. These sensor signals are shown in FIG. 10 in element 1002. Sensor signals are transmitted from element 1002 to element 1004, which performs the indicated functions and outputs its information to element 1006. Elements 1002 and 1004 are duplicated in FIG. 11 as elements 1102 and 1104. Element 1006 in FIG. 10 receives the output signals of elements 1004 and 1003 and obtains the indicated calibration constants. A storage device 1502 and a processor 1501 of FIG. 15 are used for this function.

Element 1106 of FIG. 11 receives the output signals of element 1006 and element 1104 and obtains the indicated mass flow rate as a result of solving equation 1.5.

These functions are performed using storage device 1502 and processor 1501 of FIG.

The storage device 1502 and the processor 1501 of the electronic measuring circuit 121 are also used to perform various calculations and functions shown in FIGS. 5, 6, 7, 8, 9, 12, 13 and 14.

It should be understood that the claimed invention is not limited to the description of the preferred embodiment, but covers other modifications and changes within the scope and essence of the concept of the invention. Although specific interdependencies and equations have been described in connection with the invention, it should be understood that the invention includes and can be practiced using modifications of the disclosed equations and interdependencies. In addition, although the method and device are shown in connection with a Coriolis flowmeter, it should be understood that this method and device in accordance with the invention can be used with any type of Coriolis flowmeter, including a Coriolis flowmeter with a metal, plastic or glass flow tube (s).

Claims (27)

1. A method of providing temperature compensation for a Coriolis flow meter having at least one flow tube; wherein said method comprises the following steps:
generating a first signal representing a Coriolis deflection of said flow tube;
generating a second signal representing the characteristics of said flowmeter, wherein said characteristics include an excitation frequency F of said Coriolis flowmeter, as well as an induced time delay Δt; and
characterized by the presence of an electronic measuring circuit for using the specified first and specified second signals to provide temperature compensation of the output signals of the specified Coriolis flowmeter. 2. The method according to claim 1, wherein said step of providing temperature compensation includes the following steps:
receiving a calibrated mass flow rate from a Coriolis reference flowmeter, and
using said first and said second signals and said calibrated mass flow rate value to provide said temperature compensation for said Coriolis flowmeter. 3. The method according to claim 2, wherein said step of providing temperature compensation includes the following steps:
using said first and said second signals, and said calibrated mass flow rate value, to obtain calibration constants for said Coriolis flowmeter; and
using said calibration constants to provide said temperature compensation for said Coriolis flowmeter. 4. The method according to any one of claims 1 to 3, comprising the additional step of determining a temperature compensated mass flow rate for said Coriolis flowmeter in response to said generation of said first and second signals, and said providing temperature compensation for said Coriolis flowmeter. 5. The method according to claim 1, including additional steps:
receiving a third signal representing the calibration constants of said Coriolis flowmeter; and
using said first, and said second, and said third signals to determine a temperature compensated mass flow rate for said Coriolis flowmeter. 6. The method according to claim 4, including additional steps:
determining an excitation frequency F from said second signal;
obtaining a calibration constant α _F linear frequency for zero; and
using said excitation frequency F and said linear frequency calibration constant α _F for zero to obtain the temperature-compensated mass flow rate. 7. The method according to claim 6, including additional steps:
obtaining coefficient

for flow; and
using the specified excitation frequency F and the specified constant α _F linear excitation frequency for zero, and the specified constant

for the flow to obtain the specified temperature-compensated mass flow rate. 8. The method according to claim 7, including additional steps:
get constants

F linear frequency (temperature) for the flow; and using said excitation frequency F and said calibration constant α _{F of the} linear excitation frequency for zero and said constant

for the stream, and the specified constant

F linear frequency (temperature) for the flow to obtain the specified temperature-compensated mass flow rate. 9. The method according to claim 3, wherein said step of obtaining said calibration constants comprises the following step:
receiving a mass flow rate value from a reference Coriolis flow meter; and
using said obtained mass flow rate value and said second signal to obtain said calibration constants of said Coriolis flowmeter. 10. The method of claim 9, wherein said step of generating said calibration constants comprises additional steps:
receiving said second signal to obtain a flow-induced delay Δt of the time and said frequency Coriolis excitation of the flow meter; and
using said first signal and said stream-delayed delay Δt time and said excitation frequency F to obtain said calibration constants of said Coriolis flowmeter. 11. The method of claim 10, wherein said step of generating said calibration constants comprises additional steps;
obtaining a constant α _{F of the} linear excitation frequency for a nominal time delay Δt ₀ ; and
using the specified excitation frequency F and the indicated constant α _{F of the} linear excitation frequency for the specified nominal time delay Δt ₀ to obtain the specified calibration constants. 12. The method according to any one of claims 9 to 11, wherein said calibration constants are:
Δt ₀ , α _F ,

13. The method according to any one of claims 3 and 5-11, wherein said step of obtaining said calibration constants includes the step of solving the expression:

where Δt is the time delay induced by the flow;
Δt ₀ - nominal time delay;

- mass flow rate;
F is the excitation frequency;
F ₀ - excitation frequency for the nominal zero flow;
α _F is the linear frequency constant for zero.

- constant related to FCF (CCP, flow calibration coefficient).

is the constant of the linear frequency (temperature). 14. The method according to any one of claims 5 to 8, wherein said step of determining said temperature compensated mass flow rate comprises the step of solving the expression:

where Δt is the time delay induced by the flow;
Δt ₀ - nominal time delay;

- mass flow rate;
F is the excitation frequency;
F ₀ - zero frequency of excitation;
α _F is the linear frequency constant for zero;

- constant associated with the CCP;

is the constant of linear CCP frequency (temperature). 15. The method according to claim 4, in which said step of obtaining said calibration constants includes the step of solving the expression:

where Δt is the time delay induced by the flow;
Δt ₀ - nominal time delay;

- mass flow rate;
F is the excitation frequency;
F ₀ - excitation frequency for the nominal zero flow;
α _F is the linear frequency constant for zero;

- constant associated with the CCP;

is the constant of the linear frequency (temperature). 16. The method according to claim 4, in which the specified step of determining the specified temperature-compensated mass flow rate comprises the step of solving the expression:

where Δt is the time delay induced by the flow;
Δt ₀ - nominal time delay;

- mass flow rate;
F is the excitation frequency;
F ₀ - zero frequency of excitation;
α _F is the linear frequency constant for zero;

- constant associated with the CCP;

is the constant of linear CCP frequency (temperature). 17. A device that provides temperature compensation for a Coriolis flow meter having at least one flow tube, said device comprising:
a device that generates a first signal representing Coriolis deviations of the specified flow tube;
a device that generates a second signal representing the characteristics of said flowmeter, wherein said characteristics include an excitation frequency F of said Coriolis flowmeter, as well as an induced time delay Δt; and
characterized by the presence of an electronic measuring circuit (121), in which the specified first and specified second signals are used to provide temperature compensation of the output signals of the specified Coriolis flowmeter. 18. The device according to 17, which includes:
a device that receives a calibrated mass flow value from a Coriolis reference flow meter, and
a device in which said first and said second signals and said calibrated mass flow rate value are used to provide said temperature compensation for said Coriolis flowmeter. 19. The device according to p. 18, which further includes:
a device in which said first and said second signals and said calibrated mass flow rate value are used to obtain calibration constants for said Coriolis flowmeter; and
a device in which said calibration constants and said first and said second signals and said calibrated mass flow values are used to obtain said temperature compensation for said Coriolis flowmeter. 20. The device according to any one of paragraphs.17-19, including a device that determines the temperature-compensated mass flow rate for the specified Coriolis flowmeter in response to the specified generation of the specified first and second signals, and the specified provision of the specified temperature compensation for the specified Coriolis flowmeter . 21. The device according to 17, further including:
a device that receives a third signal representing the calibration constants of the specified Coriolis flowmeter; and
a device in which said first, and said second, and said third signals, and said calibration constants are used to determine a temperature compensated mass flow rate for said Coriolis flowmeter. 22. The device according to 17, further comprising:
a device that determines the frequency F of the excitation from the specified second signal;
a device that receives the constant α _F calibration linear frequency for zero;
device that receives the coefficient

for flow;
device that gets a constant

F linear frequency (temperature) for the flow; and
a device in which the specified excitation frequency F and the specified constant α _F linear frequency of the excitation for zero, and the specified constant

for the stream, and the specified constant

F linear frequency (temperature) for the flow are used to obtain a temperature-compensated mass flow rate. 23. The device according to claim 19, in which the specified device, which receives the specified calibration constants, contains:
a device that takes a mass flow value from a Coriolis reference flow meter;
a device that receives the specified second signal to obtain the flow-induced delay Δt time and the specified frequency F of the excitation of the Coriolis flowmeter;
a device that receives a constant α _{F of the} linear excitation frequency F for a nominal time delay Δt ₀ ; and
a device in which the specified excitation frequency F, and the specified constant α _F linear excitation frequency for the specified nominal delay Δt ₀ time, and the specified value of the mass flow rate are used to obtain these calibration constants. 24. The device according to any one of paragraphs.19, 21 and 23, in which these calibration constants are:
Δt ₀ , α _F ,

25. The device according to any one of paragraphs.21 and 23, in which the specified device, which receives the specified calibration constants, includes a device that solves the expression:

where Δt is the time delay induced by the flow;
Δt ₀ - nominal time delay;

- mass flow rate;
F is the excitation frequency;
F ₀ is the excitation frequency for the nominal zero flux.
α _F is the linear frequency constant for zero;

- constant associated with the CCP;

is the constant of the linear frequency (temperature). 26. The device according to claim 20, in which the specified device, which receives the specified temperature-compensated mass flow rate, solves the following expression

where Δt is the flow-delayed delay time delay;
Δt ₀ - nominal time delay;

- mass flow rate;
F is the excitation frequency;
F ₀ - zero frequency of excitation;
α _F is the linear frequency constant for zero;

- constant associated with the CCP;

is the constant of linear CCP frequency (temperature). 27. The device according to item 22, in which the specified device, which receives the specified temperature-compensated mass flow rate, solves the following expression

where Δt is the flow-delayed delay time delay;
Δt ₀ - nominal time delay;

- mass flow rate;
F is the excitation frequency;
F ₀ - zero frequency of excitation;
α _F is the linear frequency constant for zero;

- constant associated with the CCP;

is the constant of linear CCP frequency (temperature).

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