HK1095627B - Methods and systems for validating a flow meter and calculating a flow rate and a temperature using multiple modes - Google Patents
Methods and systems for validating a flow meter and calculating a flow rate and a temperature using multiple modes Download PDFInfo
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Description
Technical Field
The invention relates to a diagnostic device and method for a coriolis flow meter.
Background
As disclosed in U.S. patent No.4,491,025 issued to j.e.smith et al at 1/1 1985 and re.31,450 issued to j.e.smith at 11/2 1982, it is known to use coriolis mass flow meters to measure mass flow and other information of material flowing through a conduit. These flow meters have one or more flow tubes of different configurations. Each conduit structure may be viewed as having a set of natural vibration modes including, for example, simple bending, torsional, radial, and coupled modes. In a typical coriolis mass flow measurement application, a conduit structure is excited in one or more vibration modes as a material flows through the conduit, and motion of the conduit is measured at points spaced along the conduit.
The vibrational mode of the material fill system is defined in part by the combined mass of the flow tube and the material within the flow tube. Material flows into the flow meter from a pipe connected on the inlet side of the flow meter. The material is then led through the flow tube or flow tubes and out of the flow meter to a pipe connected on the outlet side.
A driver applies a force to the flow tube. The force causes the flow tube to oscillate. When no material flows through the flowmeter, all points along the flow tube oscillate with the same phase. As material begins to flow through the flow tube, coriolis accelerations cause various points along the flow tube to have different phases relative to other points along the flow tube. The phase on the inlet side of the flow tube lags the driver and the phase on the outlet side leads the driver. Sensors are placed at different points on the flow tube to generate sinusoidal signals representative of the motion of the flow tube at the different points. A phase difference of signals received from the sensors in a unit time is calculated.
The phase difference between the sensor signals is proportional to the mass flow rate of the material flowing through the flow tube or flow tubes. The mass flow rate of the substance is determined by multiplying the phase difference by a flow calibration factor. The flow calibration factor is determined by a calibration procedure. During the calibration process, a known fluid is passed through the flow tube at a given flow rate, and a ratio between the phase difference and the flow rate is calculated.
One advantage of coriolis flow meters is that there are no moving parts in the vibrating flow tube. The flow rate is determined by multiplying the phase difference between two points on the flow tube by a flow calibration factor. The phase difference is calculated from sinusoidal signals received from the sensors, which are indicative of the oscillation of two points on the flow tube. The flow calibration factor is proportional to the material and cross-sectional properties of the flow tube. Thus, the measurement of the phase difference and the flow calibration factor are not affected by wear of moving parts in the flow meter.
However, a problem exists in that the material properties, cross-sectional properties, and stiffness of the flow tubes can change during operation of the coriolis flow meter. Changes in the material properties, cross-sectional properties, and stiffness of the flow tube can be caused by erosion, corrosion, and coating of the flow tube with substances flowing through the flow tube, changing piping installation and temperature. One example of a change in the cross-sectional properties of the flow tube is a change in the moment of inertia caused by corrosion of the flow tube. A second example of a change in the material and cross-sectional properties of the flow tube is an increase in the mass of the flow tube and a decrease in the cross-sectional area caused by the coating of the flow tube with a substance flowing through the tube. Changes in the material properties, cross-sectional properties, and stiffness of the flow tube can change the flow and density calibration factors of the flow meter. If the flow calibration factor of the flow meter has changed, the flow rate calculated using the original flow calibration factor is inaccurate. Therefore, there is a need in the art for a system that detects possible changes in the material properties, cross-sectional properties, and stiffness of the flow tube that indicate that the mass flow rate measured by a coriolis flowmeter may be inaccurate.
Disclosure of Invention
The above-identified and other problems are solved and an advance in the art is achieved by providing a system that verifies the integrity of a (valid) coriolis flowmeter by determining and comparing various parameters including mass flow and density. For example, as disclosed in U.S. Pat. No.5,687,100 to Buttler et al, 11.11.1997, mass flow and density were determined based on the effect of mass flow on frequency.
In accordance with an embodiment of the present invention, a method of calculating a flow rate of a flow meter using multiple modes is provided. The method of calculating a flow rate of a flow meter using multiple modes includes calibrating the flow meter for a plurality of desired modes. The method of calculating a flow rate of a flow meter using multiple modes includes determining a density of a material flowing through the flow meter associated with each mode. The method of calculating a flow rate of a flow meter using multiple modes further comprises determining a flow rate effect on density for each desired mode. The method of calculating a flow rate of a flow meter using multiple modes further includes calculating a flow rate based on the density and flow rate effect on density values for each desired mode.
In accordance with an embodiment of the present invention, a method for validating a flow meter using multiple modes is provided. The method of validating a flow meter using multiple modes includes determining a flow rate associated with each desired mode. The method of validating a flow meter using multiple modes includes comparing the flow rates and detecting an error condition in response to the comparison.
In accordance with an embodiment of the present invention, a method for validating a flow meter using multiple modes is provided. The method of validating a flow meter using multiple modes includes determining a density of a substance associated with each desired mode. The method of validating a flow meter using multiple modes includes comparing the density values associated with each mode and detecting an error condition in response to the comparison.
In accordance with an embodiment of the present invention, a method for validating a flow meter using multiple modes is provided. The method of validating a flow meter using multiple modes includes calibrating the flow meter for a plurality of desired modes. The method of validating a flow meter using multiple modes includes determining a density of a material flowing through the flow meter associated with each mode. The method for validating a flow meter using multiple modes further includes determining a flow rate effect on density for each desired mode. The method for validating a flow meter using multiple modes further includes calculating a flow rate for each desired mode based on the density and flow rate effect on density values for each desired mode. The method of validating a flow meter using multiple modes further includes comparing the flow rates and detecting an error condition in response to the comparison.
In accordance with an embodiment of the present invention, a method for validating a flow meter using multiple modes is provided. The method includes calibrating the flow meter for a plurality of desired modes. After calibration, the effect of flow rate on density was determined for each desired mode. Knowing the effect of the flow rate on the density value for each desired mode, the flow rate compensated density for each desired mode can then be calculated. The density values are then compared, and an error condition is detected in response to the comparison.
In accordance with an embodiment of the present invention, a method for determining a temperature of a material flow using multiple modes is provided. The method includes calibrating the flow meter for a plurality of ideal modes to ascertain (ascertain) calibration constants. After calibration, the tube period is calculated for each desired mode. Using the calibration constants and tube cycles for each mode, the temperature of the mass flow can be determined.
In accordance with an embodiment of the present invention, a system for calculating a flow rate of a flow meter using multiple modes is provided. The system for calculating a flow rate of a flow meter using multiple modes includes means for calibrating the flow meter for a plurality of desired modes. The system for calculating a flow rate of a flow meter using multiple modes includes means for determining a density of a material flowing through the flow meter associated with each mode. The system for calculating a flow rate of a flow meter using multiple modes further comprises means for determining the effect of flow rate on density for each desired mode. The system for calculating a flow rate of a flow meter using multiple modes further includes means for calculating a flow rate based on the density and flow rate effect on density values for each desired mode.
In accordance with an embodiment of the present invention, a system for validating a flow meter using multiple modes is provided. The system for validating a flow meter using multiple modes includes means for determining a flow rate associated with each desired mode. The system for validating a flow meter using multiple modes further includes means for comparing the determined flow rates for each mode and means for detecting an error condition in response to comparing the density values associated with each desired mode.
In accordance with an embodiment of the present invention, a system for validating a flow meter using multiple modes is provided. The system for validating a flow meter using multiple modes includes means for determining a density of a material flow associated with each desired mode. The system for validating a flow meter using multiple modes includes means for comparing the density values. The system for validating a flow meter using multiple modes further includes means for detecting an error condition in response to the compared density values.
In accordance with an embodiment of the present invention, a system for validating a flow meter using multiple modes is provided. The system for validating a flow meter using multiple modes includes means for calibrating the flow meter for a plurality of desired modes. The system for validating a flow meter using multiple modes further includes means for determining a density of a material flowing through the flow meter associated with each mode. The system for validating a flow meter using multiple modes further includes means for determining the effect of flow rate on density for each desired mode. The system for validating a flow meter using multiple modes further includes means for calculating a flow rate for each desired mode. The system for validating a flow meter using multiple modes further includes means for comparing the flow rates and means for detecting an error condition in response to the compared flow rate values.
In accordance with an embodiment of the present invention, a system for validating a flow meter using multiple modes is provided. The system for validating a flow meter using multiple modes includes means for calibrating the flow meter for a plurality of desired modes. The system for validating a flow meter using multiple modes includes means for determining the effect of flow rate on density for each desired mode. The system for validating a flow meter using multiple modes further includes means for calculating a flow rate compensated density for each desired mode. The system for validating a flow meter using multiple modes further includes means for comparing the density values and means for detecting an error condition in response to the compared density values.
In accordance with an embodiment of the present invention, a system for determining a temperature of a material flow using multiple modes is provided. The system for determining a temperature of a material flow using multiple modes includes means for calibrating the flow meter for a plurality of desired modes to ascertain calibration constants. The system for determining the temperature of a material flow using multiple modes includes means for determining a tube period for each desired mode. The system for determining the temperature of a stream using multiple modes further comprises means for determining the temperature of the stream using the calibration constants and tube cycles for each mode.
Drawings
FIG. 1 illustrates a Coriolis flowmeter in an example of the present invention;
FIG. 2 illustrates a verification system in an example of the invention;
FIG. 3 illustrates a verification system in an example of the invention;
FIG. 4 illustrates a process for determining flow rate in an example of the present invention;
FIG. 5 illustrates a verification system in an example of the invention;
FIG. 6 illustrates a verification system in an example of the invention; and
fig. 7 illustrates a process for temperature in an example of the present invention.
Detailed Description
Fig. 1-7 and the following description depict specific examples to teach those skilled in the art how to make and use the best mode of the invention. For the purpose of teaching inventive principles, some conventional aspects have been simplified or omitted. Those skilled in the art will recognize variations from these examples that are within the scope of the invention. For the sake of brevity, the examples are expressed below using two modes. It should be understood that more than two modes may be used. Those skilled in the art will appreciate that the features described below can be combined in various ways to form multiple variations of the invention. Accordingly, the invention is not limited to the specific examples described below, but only by the claims and their equivalents.
Fig. 1 shows a coriolis flowmeter 5 comprising a meter assembly 10 and meter electronics 20. The metering assembly 10 is responsive to the mass flow rate and density of the process substance. Meter electronics 20 is connected to meter assembly 10 via leads 100 to provide density, mass flow rate, and temperature information, as well as other information not relevant to the present invention, on path 26. The structure of a coriolis flowmeter is described, although it will be apparent to those skilled in the art that the present invention may be implemented as a vibrating tube densitometer without the additional measurement capability provided by a coriolis mass flowmeter.
The metering assembly 10 includes a pair of manifolds (manifold)150 and 150 ', flanges 103 and 103' having flange necks 110 and 110 ', a pair of parallel flow tubes 130 and 130', a drive mechanism 180, a temperature sensor 190, and a pair of speed sensors 170L and 170R. The flow tubes 130 and 130 'have two substantially straight inlet legs (leg)131 and 131' and outlet legs 134 and 134 'that converge toward each other at the flow tube mounting members 120 and 120'. The flow tubes 130 and 130' are bent at two symmetrical locations along their length and are substantially parallel throughout their length. Brace bars 140 and 140 'serve to define axes W and W' about which each flow tube oscillates.
The side branches 131, 131 ' and 134, 134 ' of the flow tubes 130 and 130 ' are fixedly attached to the flow tube mounting components 120 and 120 ' and these components are in turn fixedly attached to the manifolds 150 and 150 '. This provides a continuous closed material path in coriolis metering assembly 10.
Flanges 103 and 103 ' having apertures 102 and 102 ' are connected via inlet end 104 and outlet end 104 ' into a process line (not shown) that delivers a process material being measured, and the material entering end 104 of the flowmeter through orifice 101 of flange 103 is directed through manifold 150 to flow tube mounting member 120 having surface 121. Within the manifold 150, the substance is divided and conveyed through the flow tubes 130 and 130'. Upon exiting the flow tubes 130 and 130 ', the process substance is recombined into a single flow within the manifold 150' and thereafter conveyed away from the end 104 ', which end 104' is connected to a production line (not shown) by a flange 103 'having bolt holes 102'.
Flow tubes 130 and 130 ' are selected and suitably mounted to flow tube mounting members 120 and 120 ' so as to have substantially the same mass distribution, moment of inertia, and young's modulus about bending axes W-W and W ' -W ', respectively. These bending axes pass through the struts 140 and 140'. Because the young's modulus of the flow tube changes with temperature, and this change affects the flow and density calculations, a Resistance Temperature Detector (RTD)190 is mounted to the flow tube 130' to continuously measure the temperature of the flow tube. The temperature of the flow tube, and thus the voltage appearing across the RTD for a given flow therethrough, is determined by the temperature of the material passing through the flow tube. In a well known approach, the meter electronics 20 uses the temperature dependent voltage present on the RTD to compensate for changes in the elastic modulus of the flow tubes 130 and 130' caused by any changes in the flow tube temperature. The RTD is connected to meter electronics 20 by lead 195.
The flow tubes 130 and 130 'are driven by the driver 180 in opposite directions about their respective bending axes W and W' and in a first out of phase bending mode referred to as the meter. Such a drive mechanism 180 may comprise any one of a number of well known devices, such as a magnet mounted to the flow tube 130' and an opposing coil mounted to the flow tube 130, and through which an alternating current is delivered for vibrating both flow tubes. Meter electronics 20 applies the appropriate drive signal to drive mechanism 180 via lead 185.
Meter electronics 20 receives the RTD temperature signal on lead 195 and the left and right velocity signals appearing on leads 165L and 165R, respectively. Meter electronics 20 generates a drive signal that appears on lead 185 to drive member 180 and vibrate tubes 130 and 130'. Meter electronics 20 processes the left and right velocity signals and the RTD signal to calculate the mass flow rate and density of the substance through meter assembly 10. This information, along with other information, is applied by meter electronics 20 to application device 29 via path 26.
Coriolis flowmeter 5 vibrates at its resonant frequency to enable flowmeter 5 to measure mass and density. The quality measurement is based on the following formula:
wherein:
is the mass flow rate;
FCF is the flow calibration factor;
Δ t is the time delay; and
Δt0is the time delay at zero flow.
The FCF term is proportional to the stiffness of the flowmeter. Stiffness is the primary parameter affecting the performance of the flowmeter. In other words, if the stiffness of the flow meter changes, the FCF of the flow meter will change. The changes in the flowmeter performance can be caused by corrosion, erosion, and coating.
To reflect the hardness, equation (1) can be rewritten as:
wherein:
g is a geometric constant associated with a particular sensor;
e is Young's modulus; and
i is the moment of inertia.
When the flow tube of the flowmeter is changed, the area moment of inertia I changes. For example, if the tube erodes reducing wall thickness, the area moment of inertia I is reduced.
FIG. 2 illustrates a process 200 for detecting and distinguishing changes in flowmeter configuration from changes in indicated flow rate. Process 200 determines mass flow rate using multiple modes in steps 210 and 220 according to the following equationBeginning:
when multiple modes are excited by flow noise or forced vibration, the vibration of the modes will couple with the mass flow through the flow tube, causing a coriolis response for each mode. The coriolis response produces an associated Δ t that is used to calculate the mass flow readings for each mode.
Step 230 compares the mass flow readings for the respective modes. The resulting mass flow rate must be the same for each mode. If the mass flow readings are equal, step 250 generates a "correct operation" signal and the process restarts at step 210. The "correct operation" signal may be in the form of a signal visible or audible to the user.
When a deviation outside the allowable limits occurs between the mass flow rates, an error signal is generated in step 240. The error signal generated in step 240 may cause various actions to occur. For example, the error signal may cause the process to be stopped, or a visible or audible signal may be issued that alerts the operator, who then takes appropriate action.
The density measurement of coriolis flowmeter 5 is based on the following equation:
wherein:
k is the hardness of the component;
m is the mass of the assembly;
f is the frequency of oscillation; and
τ is the period of the oscillation.
Equation (4) is a solution to the equation of motion for a single degree of freedom system. The coriolis flowmeter is represented by the extension of equation (4) at zero flow, resulting in:
wherein:
e is Young's modulus;
i is the moment of inertia of the cross section;
Gρis a geometric constant;
a is the cross-sectional area;
ρ is the density;
f represents the fluid in the flow meter; and
t represents the material of the flow tube.
By rearranging the terms, equation (5) can be rewritten as:
ρf＝C1τ2-C2 (6)
wherein:
and (7)
Geometric constant GρGeometric parameters such as tube length and shape are specified. Determining the constant C as part of a standard calibration procedure for two different fluids at zero flow1And C2。
FIG. 3 illustrates a process 300 for detecting and distinguishing changes in flowmeter structure from changes in indicated density. The process 300 begins with determining the density ρ using multiple modes in steps 310 and 320. Multiple modes may be excited by flow noise or forced vibration.
Step 330 compares the density readings for each mode. The resulting density readings must be the same for each mode. If the density readings are equal, step 350 generates a "correct operation" signal and the process restarts at step 310. The "correct operation" signal may be in the form of a signal visible or audible to the user.
When a deviation outside of the allowable limits occurs between the density readings, an error signal is generated in step 340. The error signal generated in step 340 may cause various actions to occur. For example, the error signal may cause the process to be stopped, or a visible or audible signal to alert the operator, who then takes appropriate action.
In addition to the method described in equation (1) for determining mass flow, density can also be used to calculate mass flow. As more fully described in U.S. Pat. No.5,687,100 to Buttler et al 1997, 11/1997, the effect of the second order flow on the density term is added to equation (6), resulting in:
wherein:
is the mass flow rate; and
FD is the effect of flow on the density constant.
The FD term is constant for all flow rates and all densities for a given mode shape (mode shape), however, the FD term is different for each mode shape and tube geometry.
When the flow meter 5 is driven in multiple modes or multiple modes are measured, multiple equations and multiple unknowns can be derived. For example, in the case of driving the flow meter 5 in two modes, the density formula is written as follows:
wherein:
a is a first mode shape;
b is a second mode shape;
C1aτa 2-C2ais ρaTrue density using mode a;
C1bτb 2-C2bis ρbTrue density using mode b;
ρfais the true density corrected for the effect of flow on the density measurement; and
ρfbis the true density corrected for the effect of flow on the density measurement.
Equations (10) and (11) are two independent density readings corrected for flow effects using two modes at zero flow. Due to rhofaAnd ρfbAre equal, so equations (10) and (11) can be combined to form:
for single flow path, ma＝mbResulting in a solution of mass flow as follows:
fig. 4 shows a process 400 for determining mass flow based on density. The process 400 begins with calibrating the flow meter 5 using the patterns "a" and "b" in step 410. Using two different fluid densities, namely air and water, the calibration procedure determines the constant C1a、C2a、C1bAnd C2b。
Step 420 determines a density value ρ according to equation (6) aboveaAnd ρb. Step 430 compares ρaAnd ρbTo determine whether the density values are consistent. If the density values do not match, the calibration must be performed again in step 410. If the density values are consistent, steps 440 and 450 determine the associated FD values for patterns "a" and "b". Once the FD value is determined, the mass flow is calculated in step 460 using equation (13).
As defined aboveThe values may also be used to determine when a change has occurred in the flow meter. FIG. 5 illustrates a process 500 for detecting and distinguishing a change in flowmeter configuration from a change in indicated flow rate. Process 500 to determine mass flow rate from step 460 of FIG. 4 in step 510And starting.
Step 520 calculates the conventional mass flow rate according to equation (1)And compared in step 530Andif the mass flow readings are equal, step 550 generates a "correct operation" signal and the process restarts at step 510. The "correct operation" signal may be in the form of a signal visible or audible to the user.
When a deviation outside of the allowable limits occurs between the mass flow readings, an error signal is generated in step 540. The error signal generated in step 540 may cause various actions to occur. For example, the error signal may cause the process to be stopped, or a visible or audible signal to alert the operator, who then takes appropriate action.
Rho determined abovefaAnd ρfbThe values may also be used to determine when a change has occurred in the flow meter. FIG. 6 illustrates a process 600 for detecting and distinguishing changes in flowmeter structure from changes in indicated density corrected for flow rate effects.
The process 600 begins with calibrating the flow meter 5 using the patterns "a" and "b" in step 610. Using two different fluid densities, namely air and water, the calibration procedure determines the constant C1a、C2a、C1bAnd C2b. It should be understood that multiple modes may be used, and that the use of two modes in this example is for illustrative purposes only.
Step 620 determines the associated FD values for modes "a" and "b", and once the FD values are determined, ρ is calculated in step 630 using equations (10) and (11)faAnd ρfb。
Step 640 compares the density readings ρfaAnd ρfb. The density readings must be the same for each mode. If the density readings are equal, step 660 generates a "correct operation" signal and the process restarts at step 620. The above-mentionedThe "correct operation" signal may be in the form of a signal visible or audible to the user.
When a deviation outside the allowable limits occurs between the density readings, an error signal is generated in step 650. The error signal generated in step 650 may cause various actions to occur. For example, the error signal may cause the process to be stopped, or a visible or audible signal to alert the operator, who then takes appropriate action.
Multi-modal density determination can also be used to ascertain the temperature of the material flow. The density as a function of temperature is expressed according to the following formula:
ρn＝C1n*τ2(1-0.0004T)+C2n (14)
wherein:
ρnis the temperature compensation density using mode n;
c1n is a first constant using pattern n;
c2n is a second constant using pattern n;
τ is the tube period; and
t is the temperature of the material flow.
Using multiple modes, the temperature of the material flow can be ascertained using equation (14). For example, using two modes of operation, equation (14) can be expressed as two equations:
ρ1＝C11*τ2(1-0.0004T)+C21 (15)
ρ2＝C12*τ2(1-0.0004T)+C22 (16)
due to rho1And ρ2Are equal, so equations (15) and (16) are written as:
solving for T to obtain:
FIG. 7 illustrates a process 700 for ascertaining a temperature of a material flow based on a multi-mode density determination. The process 700 begins with calibrating the flow meter 5 using modes "1" and "2" in step 710. Using two different fluid densities, namely air and water, the calibration procedure determines the constant C11、C21、C12And C22。
Step 720 determines a density value ρ according to equations (15) and (16) above1And ρ2. Step 730 compares ρ1And ρ2To determine whether the density values are consistent. If the density values do not match, then the calibration must be performed again at step 710. If the density values are consistent, step 740 determines the associated tube cycle values for patterns "1" and "2". Once the tube cycle value is determined, the temperature is calculated using equation (18) at step 750.
Claims (16)
1. A method of validating a flow meter using multiple vibration modes, comprising the steps of:
determining a flow rate associated with each desired mode;
comparing the flow rates associated with each desired mode; and
an error condition is detected in response to comparing the flow rates associated with each of the desired patterns.
2. The method of claim 1, further comprising the step of signaling an error condition.
3. A method of validating a flow meter using multiple vibration modes, comprising the steps of:
determining a density of the material flowing through the flow meter associated with each desired mode;
comparing the density values associated with each ideal pattern; and
an error condition is detected in response to comparing the density values associated with the respective ideal patterns.
4. The method of claim 3, further comprising the step of signaling an error condition.
5. A method of validating a flow meter using multiple vibration modes, comprising the steps of:
calibrating the flow meter for each desired mode;
determining a density of the material flowing through the flow meter associated with each desired mode;
determining the effect of flow rate on density value for each desired mode; and
calculating a first flow rate using the density values and flow rate effects on density values for each desired mode;
calculating a second flow rate using the phase or time delay;
comparing the first and second flow rates; and
an error condition is detected in response to comparing the first and second flow rates.
6. The method of claim 5, further comprising the step of signaling an error condition.
7. A method of validating a flow meter using multiple vibration modes, comprising the steps of:
calibrating the flow meter for each desired mode;
determining the effect of flow rate on density value for each desired mode; and
determining a flow rate compensated density of material flowing through the flow meter for each desired mode;
comparing the density values associated with each ideal pattern; and
an error condition is detected in response to comparing the density values associated with the respective ideal patterns.
8. The method of claim 7, further comprising the step of signaling an error condition.
9. A system for validating a flow meter using multiple vibration modes, comprising:
means for determining a flow rate associated with each desired mode;
means for comparing said flow rates associated with each desired mode; and
means for detecting an error condition in response to comparing the flow rates associated with each of the desired patterns.
10. The system of claim 9, further comprising means for signaling an error condition.
11. A system for validating a flow meter using multiple vibration modes, comprising:
means for determining a density of the material flowing through the flow meter associated with each desired mode;
means for comparing said density values associated with each desired pattern; and
means for detecting an error condition in response to comparing the density values associated with each of the desired patterns.
12. The system of claim 11, further comprising means for signaling an error condition.
13. A system for validating a flow meter using multiple vibration modes, comprising:
means for calibrating the flow meter for each desired mode;
means for determining a density of the material flowing through the flow meter associated with each desired mode;
means for determining the effect of flow rate on density value for each desired mode; and
means for calculating a first flow rate using the density values and the flow rate effect on density values for each desired mode;
means for calculating a second flow rate using the phase or time delay;
means for comparing said first and second flow rates; and
means for detecting an error condition in response to comparing the first and second flow rates.
14. The system of claim 13, further comprising means for signaling an error condition.
15. A system for validating a flow meter using multiple vibration modes, comprising:
means for calibrating the flow meter for each desired mode;
means for determining the effect of flow rate on density value for each desired mode;
means for determining a flow rate compensated density of material flowing through the flow meter for each desired mode;
means for comparing said density values associated with each desired pattern; and
means for detecting an error condition in response to comparing the density values associated with each of the desired patterns.
16. The system of claim 15, further comprising means for signaling an error condition.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| HK09102321.7A HK1122096B (en) | 2007-03-16 | Diagnostic apparatus and methods for a coriolis flow meter | |
| HK09101572.5A HK1121804B (en) | 2007-03-16 | Diagnostic apparatus and methods for a coriolis flow meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/US2003/030662 WO2005040734A1 (en) | 2003-09-29 | 2003-09-29 | Diagnostic apparatus and methods for a coriolis flow meter |
Related Parent Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| HK09102321.7A Division HK1122096B (en) | 2007-03-16 | Diagnostic apparatus and methods for a coriolis flow meter | |
| HK09101572.5A Division HK1121804B (en) | 2007-03-16 | Diagnostic apparatus and methods for a coriolis flow meter |
Related Child Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| HK09102321.7A Addition HK1122096B (en) | 2007-03-16 | Diagnostic apparatus and methods for a coriolis flow meter | |
| HK09101572.5A Addition HK1121804B (en) | 2007-03-16 | Diagnostic apparatus and methods for a coriolis flow meter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| HK1095627A1 HK1095627A1 (en) | 2007-05-11 |
| HK1095627B true HK1095627B (en) | 2009-07-24 |
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