Abstract: A method for operating a Coriolis mass flowmeter includes: calculating error-free oscillation signal phase differences using a first measuring channel pair with a first measuring channel phase difference; calculating averaged error-containing oscillation signal phase differences using a second measuring channel pair with a second measuring channel phase difference; determining error-containing oscillation signal phase differences using a third measuring channel pair with negligible measuring channel phase difference; determining the second measuring channel phase difference by difference formation from the averaged error-containing oscillation signal phase differences of the second measuring channel pair and the error-free oscillation signal phase differences of the first measuring channel pair; obtaining error-free oscillation signal phase differences by subtracting the determined second measuring channel phase difference from the error-containing oscillation signal phase differences of the third measuring c

Abstract: The disclosure relates to a magnetoinductive flowmeter. In order to detect gas bubbles in a measuring tube, and thus an incompletely filled measuring tube, the control signal with which the magnetic field generating device is actuated is designed as an alternating rectangular pulse with time delays. A first pulse time delay is provided after a positive rectangular pulse and a second pulse time delay is provided after a negative rectangular pulse during one period, wherein no magnetic fields are provided during the pulse time delays.

Abstract: A magnetic flowmeter for measuring a fluid flow includes flow tube assembly receiving the flow having a coil with first and second coil wires for receiving a coil current to produce a magnetic field in the fluid. This generates an EMF in the fluid representative of the flow. An EMF sensor is arranged to sense the EMF and generate an output related to the flow rate. Current supply circuitry provides the coil current to the first and second wires of the coil in response to a command signal. A digital control circuit provides the command signal to the current supply circuitry as a function of a control algorithm. In one aspect, the control algorithm is adapted to changes in electrical parameters of the coil. A method of implementing the magnetic flowmeter is also provided.

Abstract: A method for pressure measurement using a Coriolis mass flowmeter. A temperature sensor measures the temperature of the measuring tube and forwards a measured temperature value to a control and evaluation unit. A tension sensor measures the mechanical tension of the measuring tube in the axial direction and/or in the circumferential direction and forwards a measured axial and/or circumferential tension value to the control and evaluation unit. The pressure of the medium is determined based on the measured temperature value and at least one measured tension value. The pressure value within the measuring tube is determined using an algorithm that takes into account the difference between the measured temperature value and a reference measured value and between at least one measured tension value and reference measured values.

Abstract: A method is provided comprising the steps of exciting a vibration mode of a flow tube (130, 130?), wherein first and second drivers (180L, 180R) are amplitude modulated out of phase from each other, and wherein a drive command provided to the first and second drivers (180L, 180R) comprises a sum of N+1 independent signals. The first and second drivers (180L, 180R) are excited with a plurality of off-resonance frequencies and the effective phase between a modal response and the drivers (180L, 180R) at each of the off-resonance frequencies is inferred. A left eigenvector phase estimate is generated for each of the off-resonance frequencies. A phase of a left eigenvector at a resonant drive frequency is estimated based on off-resonance frequency phase estimates. The method also comprises measuring the phase between a first pickoff (170L) and a second pickoff (170R) and determining a phase of a right eigenvector for the flow tube (130, 130?).

Abstract: Motion is induced in a conduit such that the conduit vibrates in a major mode of vibration having a major amplitude and a minor mode of vibration having a minor amplitude. The major amplitude is larger than the minor amplitude, the major mode of vibration has a first frequency of vibration and the minor mode of vibration has a second frequency of vibration, and the minor mode of vibration interferes with the major mode of vibration to cause a beat signal having a frequency related to the first frequency of vibration and the second frequency of vibration. The frequency of the beat signal is determined, and the second frequency of vibration is determined based on the determined frequency of the beat signal.

Abstract: A method for improving flowmeter (5) reliability is provided. The flowmeter (5) has at least one flow tube (130, 130?), at least one pickoff sensor (170L, 170R) attached to the flow tube (130, 130?), at least one driver (180L, 180R) attached to the flow tube (130, 130?), and meter electronics (20) in communication with the at least one pickoff sensor (170L, 170R) and driver (180L, 180R). The method includes the steps of vibrating at least one flow tube (130, 130?) in a drive mode vibration with the at least one driver (180L, 180R), and receiving a sensor signal based on a vibrational response to the drive mode vibration from the at least one pickoff sensor (170L, 170R). At least one flow variable is calculated. A pickoff sensor voltage is measured, and it is determined whether the pickoff sensor voltage is below a predetermined voltage threshold (304). The at least one flow variable is corrected during periods wherein the pickoff sensor voltage is below the predetermined voltage threshold (304).

Abstract: Disclosed are novel methods and techniques for introducing liquefied gas solvents into electrochemical devices. Unlike conventional electrolytes, the disclosed electrolytes are based on “liquefied gas solvents” mixed with various salts, referred to as “liquefied gas electrolytes.” The disclosed liquefied gas electrolytes can have wide electrochemical potential windows, high conductivity, low temperature capability and/or high-pressure solvent properties. Non-limiting examples of a class of liquefied gases that can be used as solvents for electrolytes include hydrofluorocarbons, and in particular include fluoromethane, difluoromethane, tetrafluoroethane, and pentafluoroethane.

Abstract: The present disclosure relates to a vibration-type sensor for measuring the density and/or the mass flow rate of a medium, having at least one first oscillator, the sensor including: a curved first measuring tube; a curved second measuring tube; at least one first elastic vibration coupler that couples the first measuring tube and the second measuring tube to each; and at least one exciter for exciting oscillator vibrations in a bending vibration mode. The oscillator has a first oscillator resonant frequency for when the measuring tubes vibrate approximately in phase in the bending vibration mode and a greater second oscillator resonant frequency for when the measuring tubes vibrate approximately in counterphase in the bending vibration mode. The first and second measuring tubes have resonant frequencies differing from their arithmetic mean by no more than 8%, no more than 4%, no more than 2% or no more than 1%.

Abstract: A flowmeter (5) is provided. The flowmeter (5) has a wetted assembly (200) comprising one or more conduits (208, 208?), and at least one driver magnet (218, 218?) attached to the one or more conduits (208, 208?). A dry assembly (202) houses a driver coil (224), and meter electronics (20) are in electrical communication with the driver coil (224). A case (236) at least partially covers the wetted assembly (200) and the dry assembly (202). The dry assembly (202) is removably attachable to the wetted assembly (200). The driver coil (224) is in magnetic communication with the at least one driver magnet (218, 218?) when the dry assembly (202) is attached to the wetted assembly (200), and the driver coil (224) is configured to provide a vibratory signal to the at least one driver magnet (218, 218?) when the dry assembly (202) is attached to the wetted assembly (200).

Abstract: A measuring transducer comprises two flow dividers having, in each case, two tubular chambers separated from one another and adapted for guiding in- and out flowing fluid, of which each has a chamber floor, in which are formed, in each case, two mutually spaced flow openings communicating with a lumen of the chamber, and as well as a tube arrangement having at least four measuring tubes connected to the flow dividers for guiding flowing fluid with parallel flow. Moreover, the measuring transducer comprises an electromechanical exciter mechanism for exciting mechanical oscillations of the measuring tubes as well as a sensor arrangement for registering oscillatory movements of the measuring tubes and for generating at least two oscillation measurement signals representing oscillations of at least one of the measuring tubes.

Abstract: A meter verification method for a vibratory flowmeter (5) is provided, comprising vibrating a sensor assembly (10) of the vibratory flowmeter (5) with a plurality of test tones in a vibration mode using a driver (180), wherein the plurality of test tones is applied substantially instantly, in the absence of a ramp function. A driver (180) current is determined, and response voltage of pickoff sensors (170L, 170R) are determined for the vibration mode. The instantaneous frequency of the pickoff sensor (170L, 170R) signals is measured, and a filter is applied to isolate the response at each of the plurality of test tones. The filter is also applied to the instantaneous frequency measurements. The same delay is applied to the frequency measurements and the response at each of the test tones. A meter stiffness value (216) is generated using the current (230) and the response voltage (231), and proper operation of the vibratory flowmeter (5) is verified using the meter stiffness value (216).

Abstract: An emitter-sensor assembly (100) for measuring a spatiotemporal relationship between two or more positions of a vibratory element (12) is provided. The emitter-sensor assembly (100) includes an emitter (110) substantially rigidly coupled to a first position (12a) of the vibratory element (12), the emitter (110) configured to emit electro-magnetic radiation (112) towards a second position (12b) of the vibratory element (12), and a sensor (120) substantially rigidly coupled to the first position (12a) of the vibratory element (12), the sensor (120) configured to receive the electro-magnetic radiation (112) reflected from the second position (12b) of the vibratory element (12).

Abstract: A method for operating a flowmeter having at least one diagnostic unit, a counter unit and a storage unit with at least one memory for carrying out a plurality of time-limited measuring operations during which the counter unit determines at least the overall volume of a fluid passing through the flowmeter during one measuring operation. The counter unit is operated for the duration of a time-limited measuring operation, and the diagnostic unit recognizes at least one erroneous or error-free state of the flowmeter. The method ensures a particularly high reliability of the measured values determined during an individual measuring operation by the diagnostic unit generating at least one status message based on the state that is transmitted to the storage unit and stored in the memory, and by several status messages being transmitted and cumulatively stored in the memory at least for the duration of the measuring operation.

Abstract: A method is provided for measuring density of a fluid by means of at least one at least sectionally curved measuring tube. The measuring tube is adapted to be flowed through by the fluid and concurrently to be caused to vibrate over a wanted oscillatory length, namely a tube length measured from a first tube end to a second tube end, a length which is greater than a minimum separation of the second tube end from the first tube end. According to the invention, among other things, also a tilt measured value representing an inclination of the at least one measuring tube in the static resting position relative to a local acceleration of gravity is ascertained, in such a manner that such represents an angle of intersection between a direction vector of an imaginary first reference axis (y-axis) and a direction vector of an imaginary second reference axis (g-axis).

Abstract: A system for differential privacy is provided. In some implementations, the system performs operations comprising receiving a plurality of indices for a plurality of perturbed data points, which are anonymized versions of a plurality of unperturbed data points, wherein the plurality of indices indicate that the plurality of unperturbed data points are identified as presumed outliers. The plurality of perturbed data points can lie around a first center point and the plurality of unperturbed data points can lie around a second center point. The operations can further comprise classifying a portion of the presumed outliers as true positives and another portion of the presumed outliers as false positives, based upon differences in distances to the respective first and second center points for the perturbed and corresponding (e.g., same index) unperturbed data points. Related systems, methods, and articles of manufacture are also described.

Abstract: A sensor assembly for a Coriolis mass flowmeter includes an upstream pipe connection connected to an upstream fluid pipe and a downstream pipe connection connected to a downstream fluid pipe. The sensor assembly installed in a shell of the flowmeter includes a fluid flow pipe, having a fluid input pipe, a fluid output pipe and a double-loop pipe connected in series therebetween; a vibration isolated structure, at least comprising first vibration isolators fixedly arranged on the fluid flow pipe to separate the fluid flow pipe into vibrating pipes and non-vibrating pipes; a weight-increasing structure, arranged on the non-vibrating pipes without contact with the shell; and a connecting structure, fixedly connected to the non-vibrating pipes on one end and to the upstream pipe connection and/or downstream pipe connection on the other to form a flexible connection therebetween.

Abstract: A method for operating a Coriolis mass flowmeter having at least one measuring tube, at least one oscillation generator, at least one oscillation sensor and at least one strain sensor. The oscillation generator is actuated with an oscillation excitation signal and the measuring tube is excited to oscillation by the oscillation generator, the oscillation of the measuring tube is detected by the oscillation sensor and an oscillation sensor signal is generated. The strain sensor is mechanically coupled to the measuring tube via a connection. A change of the mechanical coupling via the connection can be determined by the oscillation of the measuring tube being measured by the strain sensor and a strain sensor signal generated representing oscillation of the measuring tube, a correlation between the strain sensor signal and an oscillation signal representing the oscillation of the measuring tube is identified, and a temporal change of the correlation is determined.

Abstract: Method for operating a vortex flowmeter device for measuring the flow of a fluid that flows through a measuring tube in which a baffle is arranged for producing eddies in the fluid. A signal-processing device processes signals of first and sensors produced by pressure fluctuations. A first signal is obtained by multiplication of the signal of the first sensor with a correction factor, and the second signal is obtained by multiplication of the signal of the second sensor with another correction factor such that a wanted signal is obtained from the deviation between the first signal and second signals, and a sum signal is formed from the sum of the first and second signals. A correlation between the wanted signal and the sum signal is determined and the correlation is minimized by variation of the correction factors, whereby same-phase interfering signals superimposed on anti-phase sensor signals are at least minimized.

Abstract: An exciter associated with a mass flow primary comprises a rigid plate comprising a base, two outer struts, and an inner strut; at least one electromagnet formed over the inner strut; a protection circuit associated with the electromagnet; and an exciter circuit configured to induce a current in said electromagnet in order to cause vibration of said exciter.

Abstract: A method for determining a temperature of a vibrating sensor component (204A, 205A, 205?A) coupled to a conduit (203A, 203B) of a vibrating meter (200) is provided. The method comprises a step of supplying the vibrating sensor component (204A, 205A, 205?A) with a temperature determination signal (313). The method also comprises a step of measuring a resulting signal (314). The method further comprises a step of determining a temperature of the sensor component (204A, 205A, 205?A) based on the temperature determination signal (313) and the resulting signal (314).

Abstract: A control and measurement system for a coriolis flowmeter having a flowtube, a driver adapted to vibrate the flowtube, and a pair of sensors adapted to generate signals indicative of movement of the flowtube when it is being vibrated by the driver, wherein the sensors are positioned relative to one another so the signals from the sensors are indicative of a mass flow rate of fluid through the flowtube. A digital drive signal generator is adapted to generate a variable digital drive signal for controlling operation of the driver. The digital drive signal generator can be adapted to cause the driver to resist motion of the flowtube during a first time period and amplify motion of the flowtube during a second time period. The digital drive signal generator can also be adapted to initiate motion of the flowtube by sending one or more square wave signals to the driver.

Abstract: A control and measurement system for a coriolis flowmeter having a flowtube, a driver adapted to vibrate the flowtube, and a pair of sensors adapted to generate signals indicative of movement of the flowtube when it is being vibrated by the driver, wherein the sensors are positioned relative to one another so the signals from the sensors are indicative of a mass flow rate of fluid through the flowtube. A digital drive signal generator is adapted to generate a variable digital drive signal for controlling operation of the driver. The digital drive signal generator can be adapted to cause the driver to resist motion of the flowtube during a first time period and amplify motion of the flowtube during a second time period. The digital drive signal generator can also be adapted to initiate motion of the flowtube by sending one or more square wave signals to the driver.

Abstract: A liquid level detection device includes a signal source for generating one or more unique signals on low impedance signal electrodes, a lock-in amplifier, and a reference signal directly connecting the signal source to the lock-in amplifier. The unique signals generated by the signal source are connected to one or more low impedance signal electrodes. The low impedance signal electrodes may be positioned at different levels inside the tank so that at any given level of liquid in the tank, each low impedance individual electrode may or may not be in contact with the liquid in the tank. Alternatively, the low impedance signal electrodes may be attached to the external wall of the tank at different levels. An antenna is connected to an input of the lock-in amplifier. The antenna may be placed inside the tank at the lowest level for the liquid, or the antenna may be attached to the outside wall of the tank near the bottom of the tank.

Abstract: A flowmeter is disclosed. The flowmeter includes a vibratable conduit, and a driver connected to the conduit that is operable to impart motion to the conduit. A sensor is connected to the conduit and is operable to sense the motion of the conduit and generate a sensor signal. A controller is connected to receive the sensor signal. The controller is operable to detect a single-phase flow condition and process the sensor signal using a first process during the single-phase flow condition to generate a validated mass-flow measurement. The controller is also operable to detect a two-phase flow condition and process the sensor signal using a second process during the two-phase flow condition to generate the validated mass-flow measurement.

Abstract: A flowmeter is disclosed. The flowmeter includes a vibratable conduit, and a driver connected to the conduit that is operable to impart motion to the conduit. A sensor is connected to the conduit and is operable to sense the motion of the conduit and generate a sensor signal. A controller is connected to receive the sensor signal. The controller is operable to detect a single-phase flow condition and process the sensor signal using a first process during the single-phase flow condition to generate a validated mass-flow measurement. The controller is also operable to detect a two-phase flow condition and process the sensor signal using a second process during the two-phase flow condition to generate the validated mass-flow measurement.

Abstract: Drive techniques for a digital flowmeter are described. The drive techniques account for delays caused during digital signal processing of sensor signals that correspond to a motion of a flowtube, as well as drive signals that impart motion to the flowtube. Such delays may be caused by a variety of factors, including delays associated with analog/digital conversion of the signals and/or filtering of the signals. The techniques include open-loop techniques and closed-loop techniques, which can be used separately or together during the start-up and operation of the digital flowmeter.

Abstract: A control and measurement system for a coriolis flowmeter having a flowtube, a driver adapted to vibrate the flowtube, and a pair of sensors adapted to generate signals indicative of movement of the flowtube when it is being vibrated by the driver, wherein the sensors are positioned relative to one another so the signals from the sensors are indicative of a mass flow rate of fluid through the flowtube. A digital drive signal generator is adapted to generate a variable digital drive signal for controlling operation of the driver. The digital drive signal generator can be adapted to cause the driver to resist motion of the flowtube during a first time period and amplify motion of the flowtube during a second time period. The digital drive signal generator can also be adapted to initiate motion of the flowtube by sending one or more square wave signals to the driver.

Abstract: A control and measurement system for a coriolis flowmeter having a flowtube, a driver adapted to vibrate the flowtube, and a pair of sensors adapted to generate signals indicative of movement of the flowtube when it is being vibrated by the driver, wherein the sensors are positioned relative to one another so the signals from the sensors are indicative of a mass flow rate of fluid through the flowtube. A digital drive signal generator is adapted to generate a variable digital drive signal for controlling operation of the driver. The digital drive signal generator can be adapted to cause the driver to resist motion of the flowtube during a first time period and amplify motion of the flowtube during a second time period. The digital drive signal generator can also be adapted to initiate motion of the flowtube by sending one or more square wave signals to the driver.

Abstract: A mass flow rate sensor system (200) is provided. The mass flow rate sensor system (200) includes a density meter (202) including a sensor assembly (204a) and a density meter electronics (204b) configured to generate a density measurement of a process fluid. The mass flow rate sensor system (200) further includes a volumetric flow meter (203) including a sensor assembly (205a) and a volumetric meter electronics (205b) configured to generate a volumetric flow rate of the process fluid and in electrical communication with the density meter electronics (204b). A remote processing system (207) is provided that is in electrical communication with only one of the density meter electronics (204b) or the volumetric meter electronics (205b).

Abstract: A flowmeter is disclosed. The flowmeter includes a vibratable conduit, and a driver connected to the conduit that is operable to impart motion to the conduit. A sensor is connected to the conduit and is operable to sense the motion of the conduit and generate a sensor signal. A controller is connected to receive the sensor signal. The controller is operable to detect a single-phase flow condition and process the sensor signal using a first process during the single-phase flow condition to generate a validated mass-flow measurement. The controller is also operable to detect a two-phase flow condition and process the sensor signal using a second process during the two-phase flow condition to generate the validated mass-flow measurement.

Abstract: A control and measurement system for a coriolis flowmeter having a flowtube, a driver adapted to vibrate the flowtube, and a pair of sensors adapted to generate signals indicative of movement of the flowtube when it is being vibrated by the driver, wherein the sensors are positioned relative to one another so the signals from the sensors are indicative of a mass flow rate of fluid through the flowtube. A digital drive signal generator is adapted to generate a variable digital drive signal for controlling operation of the driver. The digital drive signal generator can be adapted to cause the driver to resist motion of the flowtube during a first time period and amplify motion of the flowtube during a second time period. The digital drive signal generator can also be adapted to initiate motion of the flowtube by sending one or more square wave signals to the driver.

Abstract: Motion is induced in a conduit such that the conduit vibrates in a major mode of vibration having a major amplitude and a minor mode of vibration having a minor amplitude. The major amplitude is larger than the minor amplitude, the major mode of vibration has a first frequency of vibration and the minor mode of vibration has a second frequency of vibration, and the minor mode of vibration interferes with the major mode of vibration to cause a beat signal having a frequency related to the first frequency of vibration and the second frequency of vibration. The frequency of the beat signal is determined, and the second frequency of vibration is determined based on the determined frequency of the beat signal.

Abstract: First and second ?? modulators convert output signals of two sensors into pulse density signals. First and second LPFs convert the pulse density signals into multi-bit signals. A signal computing module calculates a mass flow rate based on the multi-bit signals. A resonance circuit generates an excitation signal based on the output signals of the sensors. A drive output module amplifies the excitation signal. An exciter excites the measurement tube using an amplified excitation signal. A multiplier amplifies one of the pulse density signals to generate a multi-bit signal. An amplification factor controller controls an amplification factor of the multiplier based on the multi-bit signal. A third ?? modulator converts an amplified signal into a pulse density signal. A DAC generates the excitation signal based on the pulse density signal.

Abstract: The present invention relates to an inferential coriolis mass flowmeter characterized by: a power supply (10);a pressure sensor (11) connected to the power supply (10) and a tube of fluid; a current to voltage converter (13) connected to the pressure sensor (11) for converting a current signal from the pressure sensor (11) to a voltage signal; a controller unit (20) including an analogue to digital converter (21) connected to the current to voltage converter (13) for converting analogue signal from the current to voltage converter (13) to a digital signal, and a microprocessor (22) for processing the digital signal from the analogue to digital converter (21) to determine the mass flowrate of the fluid, wherein said microprocessor (22) is embedded with an algorithm to determine the mass flowrate of a fluid according to equation (1): y=0.002x4?0.0218x3+0.0865x2+0.8769x+0.0846 ; a display panel (14) connected to the microprocessor (22); and a transmission circuit (15) connected to the microprocessor (22).

Abstract: A signal processing method, a signal processing apparatus, and a Coriolis flowmeter are capable of always performing measurement with constant precision and performing phase measurement with high filtering performance and a small amount of computation even when a temperature of a fluid to be measured changes, air bubbles are mixed into the fluid to be measured, or the fluid to be measured rapidly changes from a gas to a liquid. The Coriolis flowmeter detects at least one of a phase difference and a vibration frequency proportional to a Coriolis force acting on at least one flow tube or a pair of flow tubes.

Abstract: A control and measurement system for a coriolis flowmeter having a flowtube, a driver adapted to vibrate the flowtube, and a pair of sensors adapted to generate signals indicative of movement of the flowtube when it is being vibrated by the driver, wherein the sensors are positioned relative to one another so the signals from the sensors are indicative of a mass flow rate of fluid through the flowtube. A digital drive signal generator is adapted to generate a variable digital drive signal for controlling operation of the driver. The digital drive signal generator can be adapted to cause the driver to resist motion of the flowtube during a first time period and amplify motion of the flowtube during a second time period. The digital drive signal generator can also be adapted to initiate motion of the flowtube by sending one or more square wave signals to the driver.

Abstract: A control and measurement system for a coriolis flowmeter having a flowtube, a driver adapted to vibrate the flowtube, and a pair of sensors adapted to generate signals indicative of movement of the flowtube when it is being vibrated by the driver, wherein the sensors are positioned relative to one another so the signals from the sensors are indicative of a mass flow rate of fluid through the flowtube. A digital drive signal generator is adapted to generate a variable digital drive signal for controlling operation of the driver. The digital drive signal generator can be adapted to cause the driver to resist motion of the flowtube during a first time period and amplify motion of the flowtube during a second time period. The digital drive signal generator can also be adapted to initiate motion of the flowtube by sending one or more square wave signals to the driver.

Abstract: A signal processing method for a Coriolis flowmeter including: performing frequency conversion to combine an oscillation frequency to each of two flow rate signals obtained by A/D conversion on input signals of the phase difference and/or the vibration frequency proportional to the Coriolis force acting on the at least one flow tube; measuring a frequency of a composite waveform associated with at least one of the vibration detection sensors; transmitting a control signal based on the measured frequency; controlling so that a sum frequency component or a difference frequency component of a composite component of a composite frequency signal is constant; and measuring phases from a sum signal or a difference signal of each of controlled converted composite frequencies, to thereby obtain a phase difference signal component.

Abstract: A flow measurement system (20) is provided according to an embodiment of the invention. The flow measurement system (20) comprises a vibrating flow meter (400) including at least one flow tube (410) and a driver (420) adapted to apply a biasing force on the flow tube (410). The flow measurement system (20) also comprises a meter electronics (450) configured to generate a drive signal to vibrate the flow tube (410) about a first deflected position (1002), wherein the first deflected position (1002) is offset from a flow tube rest position (1001).

Abstract: A flowmeter is disclosed. The flowmeter includes a vibratable conduit, and a driver connected to the conduit that is operable to impart motion to the conduit. A sensor is connected to the conduit and is operable to sense the motion of the conduit and generate a sensor signal. A controller is connected to receive the sensor signal. The controller is operable to detect a single-phase flow condition and process the sensor signal using a first process during the single-phase flow condition to generate a validated mass-flow measurement. The controller is also operable to detect a two-phase flow condition and process the sensor signal using a second process during the two-phase flow condition to generate the validated mass-flow measurement.

Abstract: A signal processing method for a Coriolis flowmeter including: performing frequency conversion of a first digital signal, the frequency conversion performed on the first digital signal modulating the frequency of the first digital signal so that the frequency of the first digital signal after the frequency conversion is 1/Nth of the frequency of the first digital signal before the frequency conversion, where N is an integer; performing frequency conversion of a second digital signal, the frequency conversion performed on the second digital signal modulating the frequency of the second digital signal so that the frequency of the second digital signal after the frequency conversion is 1/Nth of the frequency of the second digital signal before the frequency conversion; and measuring a phase difference between (i) the frequency converted first digital signal and (ii) the frequency converted second digital signal.

Abstract: Meter electronics (20) for processing sensor signals in a flow meter and for computing mass flow rate, density or volume flow rate includes an interface (201) for receiving a first sensor signal and a second sensor signal and a processing system (203) in communication with the interface (201) and configured to generate a ninety degree phase shift from the first sensor signal with a Hilbert transform and compute a phase difference from the ninety degree phase shift, the first sensor signal and the second sensor signal. A frequency is computed from the first sensor signal and the ninety degree phase shift. A second ninety degree phase shift can be generated from the second sensor signal.

Abstract: A signal processing method for a Coriolis flowmeter, the signal processing method including: measuring a frequency of a first digital signal obtained by converting a first input signal from one of a pair of vibration detection sensors into the first digital signal; transmitting a modulatable frequency signal based on the measured frequency of the first digital signal; performing frequency conversion to add or subtract the frequency of the modulatable frequency signal to or from the frequency of the first digital signal; performing frequency conversion to add or subtract the frequency of the modulatable frequency signal to or from the frequency of a second digital signal obtained by converting a second input signal from the other one of the pair of vibration detection sensors into the second digital signal; and measuring a phase difference between (i) the frequency converted first digital signal and (ii) the frequency converted second digital signal.

Abstract: A flowmeter is disclosed. The flowmeter includes a vibratable conduit, and a driver connected to the conduit that is operable to impart motion to the conduit. A sensor is connected to the conduit and is operable to sense the motion of the conduit and generate a sensor signal. A controller is connected to receive the sensor signal. The controller is operable to detect a single-phase flow condition and process the sensor signal using a first process during the single-phase flow condition to generate a validated mass-flow measurement. The controller is also operable to detect a two-phase flow condition and process the sensor signal using a second process during the two-phase flow condition to generate the validated mass-flow measurement.

Abstract: Drive techniques for a digital flowmeter are described. The drive techniques account for delays caused during digital signal processing of sensor signals that correspond to a motion of a flowtube, as well as drive signals that impart motion to the flowtube. Such delays may be caused by a variety of factors, including delays associated with analog/digital conversion of the signals and/or filtering of the signals. The techniques include open-loop techniques and closed-loop techniques, which can be used separately or together during the start-up and operation of the digital flowmeter.

Abstract: Flowmeters are described in which a sensor signal received from a sensor that is attached to vibratable flowtube, so as to determine properties of a fluid within the flowtube, contains a drive signal component and a Coriolis mode component. The flowmeters are operable to determine drive parameters of the drive signal component, as well as Coriolis parameters of the Coriolis mode component. By analyzing the sensor signal based on the drive signal parameters, and not on the Coriolis signal parameters, the flowmeters are able to provide stable and accurate determinations of the properties of the fluid.

Abstract: A control and measurement system for a coriolis flowmeter having a flowtube, a driver adapted to vibrate the flowtube, and a pair of sensors adapted to generate signals indicative of movement of the flowtube when it is being vibrated by the driver, wherein the sensors are positioned relative to one another so the signals from the sensors are indicative of a mass flow rate of fluid through the flowtube. A digital drive signal generator is adapted to generate a variable digital drive signal for controlling operation of the driver. The digital drive signal generator can be adapted to cause the driver to resist motion of the flowtube during a first time period and amplify motion of the flowtube during a second time period. The digital drive signal generator can also be adapted to initiate motion of the flowtube by sending one or more square wave signals to the driver.

Abstract: Startup and operational techniques for a digital flowmeter are described. For example, during a startup operation of the flowmeter, the mode of operation might include a random sequence mode, in which filtered, random frequencies are applied as a drive signal to a flowtube associated with the digital flowmeter. Once the flowtube reaches a resonant mode of vibration, the digital flowmeter may transition to a positive feedback mode, in which a sensor signal representing a motion of the flowtube is fed back to the flowtube as a drive signal. In a digital synthesis mode of operation, the analyzed sensor signals are used to synthesize the drive signal. The digital flowmeter may revert to a previous mode to regain stable and desired oscillation of the flowtube, such as might be required during a recovery operation associated with a disturbance to an operation of the digital flowmeter.

Abstract: Drive techniques for a digital flowmeter are described. The drive techniques account for delays caused during digital signal processing of sensor signals that correspond to a motion of a flowtube, as well as drive signals that impart motion to the flowtube. Such delays may be caused by a variety of factors, including delays associated with analog/digital conversion of the signals and/or filtering of the signals. The techniques include open-loop techniques and closed-loop techniques, which can be used separately or together during the start-up and operation of the digital flowmeter.