Abstract: Startup and operational techniques for a digital flowmeter are described. The techniques select an optimal mode of operation for the digital flowmeter, depending on a current environment of the flowmeter. 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, as part of a feedback loop. Once an oscillation of the flowtube is achieved and analyzed, a digital synthesis mode of operation may be implemented, in which the analyzed sensor signals are used to synthesize the drive signal.

Abstract: A magnetic induction flowmeter has a plastic measuring tube (1), which can be inserted into a pipeline system, having at least two mutually opposite measuring electrodes (3) introduced into the wall of the measuring tube (1) in order to register a measuring voltage, a magnetic unit (2), likewise arranged on the outside of the measuring tube (1), generating a magnetic field aligned substantially at right angles to the flow direction of the conductive flow medium to be measured. The plastic measuring tube (1) is equipped with means for diverting axial and thrust forces which act from the outside on the measuring tube (1) inserted into the pipeline system, in order to keep destructive mechanical loadings away from the measuring tube (1).

Abstract: An electromagnetic flowmeter includes a measuring tube (1) through which a fluid to be measured flows, electrodes (2a, 2b) which are placed in this measuring tube and detect an electromotive force generated by a magnetic field applied to the fluid and the flow of the fluid, an exciting coil (3) and power supply unit (4) which apply a time-changing magnetic field to the fluid, a signal conversion unit (5) which extracts a ?A/?t component from the resultant electromotive force of the electromotive force based on the ?A/?t component irrelevant to the flow velocity of the fluid and the electromotive force based on a v×B component originating from the flow velocity of the fluid, which are detected by the electrodes (2a, 2b), and a flow rate output unit (6) which extracts only the v×B component by removing the extracted ?A/?t component from the resultant electromotive force, and calculates the flow rate of the fluid based on the v×B component.

Abstract: A measuring device, embodied, for example, as an in-line measuring device and/or flow measuring device, serves for registering at least one measured variable of a medium, for example a medium flowing in a pipeline, and is made, at least in part, of a solid, biologically degradable, synthetic material (BDM).

Abstract: An exciting unit, applies, to a fluid, a time-changing magnetic field asymmetrical to a plane (PLN). An electrode is placed on the plane in a measuring tube, and detects a resultant electromotive force of an electromotive force based on ?A/?t component (A: vector potential, t: time) irrelevant to a flow velocity of the fluid and an electromotive force based on a v×B component originating from the flow velocity of the fluid. A state quantifying unit extracts the ?A/?t component and a variation factor dependent on a parameter to be detected, and quantifies the parameter on the basis of the variation factor. The characteristic and state of the fluid and the state in the measuring tube can be detected regardless of the flow rate of the fluid by using the same hardware arrangement as that of an electromagnetic induction type flowmeter.

Abstract: A static fluid meter includes a flow rate sensor having a set of stationary measuring parts, and a measurement tube having one opening that serves as a fluid inlet and another opening as a fluid outlet, the tube containing internally a first set of said measuring parts and supporting externally a second set of said measuring parts. An outer case into which said measurement tube is inserted and fastened in leaktight manner, contains at least parts for processing data from said sensor. The case is made from a box provided with two through orifices in its sides for passing the measurement tube assembly and for leaktight fastening to corresponding flanges arranged on said measurement tube.

Abstract: A magnetic transducer (109) for measuring the flow of a fluid (108) has electrodes (102) and an alternating magnetic field (107), an electrode (102) having lower noise energy at frequencies below 5 Hz than an electrode comprising carbon or corrosion-resistant metal alloy. The noise characteristic of the electrode (102) at magnetic field frequencies around 1 Hz is lower than that of an electrode comprising carbon or corrosion-resistant metal alloy.

Abstract: A method is provided for measuring the flow rate of a medium in a volume subjected to a magnetic field. The electrical resistance of a semiconductor arranged adjacent to the volume is measured, and the flow rate of the medium is computed from this electrical resistance.

Abstract: A magnetic induction flowmeter having a metal measuring tube (1), which can be inserted into a pipeline system via flanged sections (2a, 2b) at the ends, having at least two mutually opposite measuring electrodes (5a, 5b) introduced into the wall of the measuring tube (1) in an electrically insulated manner in order to register a measuring voltage, a magnetic unit (4), likewise arranged on the outside of the measuring tube (1), generating a magnetic field aligned substantially at right angles to the flow direction of the conductive flow medium to be measured, and the measuring tube (1) being provided with an electrically insulating layer (6) on the inside; in the region of the flanged sections (2a, 2b) at the end of the measuring tube (1), an expanded lattice (7) being fixed to the measuring tube (1), to which lattice the insulating layer (6) is applied in such a way that the expanded lattice (7) located within the insulating layer (6) ensures a firm connection between insulating layer (6) and measuring tube

Abstract: There is described a tubular insert for a magnetically inductive flowmeter, a production method for said type of tubular insert and a flowmeter. The tubular insert is made of, essentially, an electrically-insulating material, in particular, rubber, which is reinforced by a tubular moulding part made of a dimensionally stable plastic which is based on polymers, at least in a measuring section. The tubular moulding part is embedded in the electrically-insulating rubber material by a press or casting method such that the electrically-insulating, rubber material essentially covers the inner surfaces of the tubular moulding part. An economical to produce, robust, tubular insert is thus achieved.

Abstract: Problems of instability and non-linearity in probe-type magnetic flow meters are ameliorated by either or both of a conductor coating connecting a tip portion of the probe with a supporting probe stem and flat end plates parallel to the flow direction that are arranged adjacent to the sensing electrodes and that act to straighten and confine fluid flowing past the electrodes.

Abstract: An electromagnetic flowmeter includes a measuring tube through which a fluid flows, electrodes which detect an electromotive force generated by a magnetic field applied to the fluid. An exciting coil applies, to the fluid, a magnetic field asymmetrical to a plane (PLN) which includes the electrodes and is perpendicular to the axial direction of the measuring tube. A signal conversion unit extracts a ?A/?t component from the resultant electromotive force of the electromotive force. A flow rate output unit removes a variation factor for a span as a coefficient applied to the magnitude of the flow velocity on the basis of the ?A/?t component, and calculates the flow rate of the fluid from the result obtained by removing the variation factor. The exciting coil applies the magnetic fields including the plurality of frequency components to the fluid.

Abstract: An electromagnetic flowmeter includes a measuring tube through which a fluid to be measured flows, electrodes which detect an electromotive force generated by a magnetic field applied to the fluid. An exciting coil applies, to the fluid, a time-changing magnetic field asymmetrical to a plane (PLN) which includes the electrodes and is perpendicular to the axial direction of the measuring tube. A signal conversion unit extracts a ?A/?t component from the resultant electromotive force of the electromotive force. A flow rate output unit removes a variation factor for a span as a coefficient applied to the magnitude of the flow velocity on the basis of the ?A/?t component, and calculates the flow rate of the fluid from the result obtained by removing the variation factor.

Abstract: An apparatus for sensing liquid flow rate comprises a conduit for conducting a flow of liquid through it and a flow sensor. The flow sensor includes a fixed portion attached to a sidewall of the conduit. The fixed portion has a pair of stationary electrodes positioned in spaced apart relation and adapted to contact the liquid conducted through the conduit. The flow sensor further includes a cartridge portion adapted for removable engagement with the fixed portion. The cartridge portion has sensor terminals adapted to electrically engage the stationary electrodes. In addition, the flow sensor includes an electromagnetic coil operative to generate a magnetic field within the fluid flow.

Abstract: An open circuit gravity-assisted uroflowmeter has a urine collector having a generally open inlet in fluid communication with a sensing passage located at a lower elevation than the inlet, the sensing passage intersecting a magnetic field and having electrodes for detecting a flow-dependent voltage induced by the passage of urine through the magnetic field. Preferred embodiments of the uroflowmeter may have low pressure drop, rapid response and simple construction.

Abstract: There is described a tubular insert for a magnetic inductive flowmeter, a production method for such a tubular insert and a flowmeter. The tubular insert essentially comprises an electrically-insulating material, in particular, rubber, reinforced with a metal mesh, at least in a measuring section. The tubular metal mesh comprises one or more mesh sections, pre-prepared from sheet mesh by stamping, bending and welding butt edges running essentially parallel to the tube axis such as to form an essentially tubular metal mesh. The tubular metal grid is embedded in the electrically-insulating material passing therethrough and the electrically-insulating material essentially covers the inner and out surfaces of the tubular material. A robust, tubular insert is thus achieved, with a corresponding cheap production cost.

Abstract: A magnetic-inductive flow meter with a measuring tube (1) made of metal, which is flowed through by a medium (4) which has a minimum electrical conductivity and is permeated by a magnetic field generated by means of an arrangement of magnets (5), in the region of which field at least two measuring electrodes (6) arranged diametrically on the measuring tube (1) are provided for sensing the inductively generated measuring voltage, the metal measuring tube (1) being provided with an electrically insulating inner layer (7) and an electrically conductive grounding disk (8) being arranged at the end face for grounding the medium flowing through the measuring tube (1), which disk is connected to ground via the measuring tube, the grounding disk (8?) consisting of an electrically conductive plastic which comes to lie in sealing contact directly against the end face (2) of the measuring tube (1) in order to be connected to ground by the direct contact.

Abstract: A magnetoinductive flowmeter having a measurement tube (1), through which a flowable medium (3) flows, with a magnet unit (4a, 4b) which is arranged on the outside of the measurement tube (1) and produces a magnetic field which is oriented substantially perpendicular to the direction of flow of the flowable medium (3), with at least two measurement electrodes (5a, 5b) which are inserted opposite one another in the wall of the measurement tube (1) such that they are electrically insulated being provided for detecting the measurement voltage which is induced through the flowable medium (3) in the magnetic field and each coming into contact with the flowable medium (3) by means of at least one end face (9), so that the measurement electrodes (5a, 5b) operate in the manner of galvanic electrodes, wherein each measurement electrode (5) is designed in a divided manner and comprises a head section (8) which is composed of a noble, low-corrosion material and also a shaft section (7) which is composed of a base, elect

Abstract: The process measuring device comprises a flow sensor having a measuring tube, a sensor arrangement for producing a measurement signal, and an evaluation and operating circuit. The method serves to compensate for the effects of interfering potentials which are caused especially by foreign particles or air bubbles in the liquid to be measured. For this purpose, an anomaly in the waveform of the measurement signal caused at least in part by an electrical, especially pulse-shaped, interfering potential is detected by determining within a stored first data set a data group which digitally represents the anomaly. To generate an interference-free data set, the data belonging to the data group are removed from the stored first data set.

Abstract: A magnetoinductive flowmeter includes a measuring tube containing an electrode that is provided with an electroconductive diamond coating, as a result of which the galvanic contact between the electrode and the medium that flows through the measuring tube is indirect, i.e. via the electroconductive diamond coating. This produces an electrode that offers mechanical strength and is conducive to interference-free measuring signals. A method for producing the flowmeter is also disclosed.

Abstract: An electromagnetic flowmeter calibration verification device for a flow tube comprises a first electrode, attachable to the flow tube, for transmitting, in use, a test current into the flow tube, and a second electrode, attachable to the flow tube, for receiving, in use, the test current transmitted through the flow tube. The device is arranged such that, in use, the test current, when passing from one electrode to another, passes through liquid in the flow tube. The device further comprises a third electrode, attachable to the flow tube, such that, in use, a voltage generated due to current distribution within the flow tube when the test current is passing within the tube is determined, and means for generating an output signal to a user if the voltage generated is outside a predetermined range. A method of verifying the calibration of an electromagnetic flowmeter for a flow tube is also provided.

Abstract: The invention relates to a device for integrating electrodes (12) characterizing the flow of a multiphase fluid in a tubing (10). The device includes a tube section (14) made out of an electrically insulating material and bearing the electrodes on its external surface. A metal compensation sheath (16) encircles the section (14), being separated from the latter by an insulating and incompressible fluid. An annular chamber (18) outside the sheath communicates with the inside of the tubing (10). The sheath (16) is fixed on seal rings (29) inserted at the ends of the section (14), by reinforcement for example.

Abstract: An apparatus for measuring flow of a medium through a measuring tube directed along a longitudinal axis of the measuring tube.

Abstract: An electromagnetic flowmeter includes a measuring tube, an electrode, an exciting unit, a signal conversion unit, and a flow rate calculating unit. The signal conversion unit extracts a ?A/?t component irrelevant to a flow velocity of the fluid and a v×B component originating from the flow velocity of the fluid from a resultant electromotive force of an electromotive force ?A/?t, with A, t, v, and B respectively representing a vector potential, a time, a flow velocity, and a magnetic flux density. The flow rate calculating unit extracts a variation component dependent on a parameter from the ?A/?t component, corrects a span which is a coefficient applied to a magnitude V of the flow velocity of the v×B component, and calculates the flow rate of the fluid from the v×B component whose span is corrected.

Abstract: A magnetic flow metering device and method is disclosed for the measurement of corrosive flow streams. The device utilizes a unibody construction wherein the flow conduit is constructed entirely from an insulative, non-conducting material without resorting to a metallic outer housing. The portions of the electrodes in contact with the flow stream are made of a suitable conductive polymer material, resistant to the corrosive media. The electrodes also feature shields that are molded into the electrode assembly to reduce background electrical noise. The invention also utilizes an electrical configuration that actively drives the electrode shield circuit (electrodes as well as cabling) to provide a more accurate measurement of the electromotive force.

Abstract: The invention relates to a magneto-inductive method for determining the flow rate of a medium flowing through a measuring tube in the direction of the measuring tube axis. In order to be able to detect a coating formation on a measuring electrode early and with a high degree of certainty, a test pulse (Up) of defined pulse length (tp) is issued to the measuring electrode; at least one signal in response to the test pulse (Up) is determined at at least two measuring points in time (t1, t2), wherein the measuring points in time (t1, t2) lie in a time window (tend-tbegin), which is so selected that no predictable disturbance signals occur on the measuring electrode in this time window (tend-tbegin).

Abstract: A flow sensor includes: A measuring tube for the conveying of an electrically conductive fluid; a magnetic circuit arrangement arranged on the measuring tube for producing and guiding a magnetic field, which induces an electric field in the flowing fluid; and measuring electrodes for the tapping of a voltage of the electric field. The measuring tube includes a carrier tube and liner, especially a tubular liner, of insulating material, accommodated in a lumen of the carrier tube. A support skeleton may serve for stabilization is embedded in the liner.

Abstract: Methods and apparatuses for detecting radial flows of conductive fluid are provided. In an embodiment of the present invention, shields are used to prevent or reduce circulating electrical currents from causing a voltage difference that would adversely affect the measured voltage difference between two adjacent electrodes. The shields may be a conduit through which conductive fluid may flow. Groups of sensors, e.g., two or more, may be placed within the shield. The shields may have any cross-section shape. Generally, once the circulating electrical current flow between the electrode pairs is substantially reduced or eliminated, only the voltage difference from the localized induced electric field remains. This way, a true induced voltage may be measured, and thus an accurate value for the fluid velocity may be determined.

Abstract: The invention relates to a method and a device for operating a flow meter, in particular magnetically inductive flow meters but also capacitive meters, as well as those which comprise electrodes which can be used in order to feed a signal into the fluid to be measured, according to the preamble of patent claim 1. In order to record a diagnosis both of the meter per se, but also of the changes in the constitution or consistency of the flowing medium at any time during measurement operation, according to the invention a signal E1i in the form of a current or a voltage is applied to at least one electrode and, at another electrode E2i which does not receive the signal or is not currently activated, impedances are determined and/or voltage(s) and/or current(s) are measured, wherein these values are set in comparison/ratio with previous values and the status/a perturbation of the device and/or of the measurement medium is deduced first qualitatively and then quantitatively therefrom.

Abstract: A magnetoinductive flowmeter for measuring the flow rate of a moving medium includes a measuring tube conducting the medium, and an insert provided in the measuring tube. The insert consists of at least one first part and one second part which first part is introduced into the measuring tube from one end of the measuring tube while the second part, introduced into the measuring tube from the other end of the measuring tube, is joined with the first part in leak-proof fashion. The result is an easy-to-install insert that ensures secure and maintainable retention.

Abstract: An electromagnetic flowmeter has a measuring tube through which a fluid to be measured flows, a magnetic field applying section which applies a magnetic field to the fluid to be measured, and a couple of electrodes which pick up an electromotive force generated according to a flow rate of the fluid to be measured, wherein each of the electrodes has an interface processed by electropolishing.

Abstract: In order to attain a desired magnetic flux density, a parallel configuration of N divided magnetic circuits is formed, and accommodated on one pair of plate cores as N groups of exciting coils. According to the configuration, the burden of the magnetic coercive force which is driven by one of the magnetic circuits is reduced to 1/N. As a result, the consumption of the excitation power in each of the magnetic circuits can be reduced to (1/N)2. The total of magnetic fluxes which are obtained as a result of parallel driving of the N magnetic circuits are collected onto the single plate core.

Abstract: An inductive flow meter for conductive liquids includes a flow channel, diametrically opposite measuring electrodes, and a magnetic field generating system generating a magnetic field in a direction substantially perpendicular to a connecting line between the measuring electrodes and perpendicular to the axis of the flow channel. Active surface structures are used to provide a desired shape to the magnetic field such that the magnetic field lines pass to a limited extent via the inner wall of the flow channel to improve measurement accuracy.

Abstract: An ultrasonic flow rate measuring device, especially a clamp-on ultrasonic flow rate measuring device, with at least one ultrasonic transducer (8) for measuring the flow rate through a line through which a medium flows. The ultrasonic transducer (8) is located within an electromagnetic shielding arrangement (6). Thus, an ultrasonic flow rate measuring device which delivers a good signal-to-noise ratio is achieved.

Abstract: An ultrasonic flow rate measuring device for measuring the flow rate through a line through which a medium flows has at least one ultrasonic transducer that has a piezo element and a connecting element designed for attaching the ultrasonic transducer to the line with the piezo element attached to the connecting element. An intermediate layer including a plate is disposed between the piezo element and the connecting element that is electrically conductive and attachable to an electromagnetic shield. Thus, an ultrasonic flow rate measuring device that delivers a greater signal-to-noise ratio is achieved.

Abstract: A magnetic-inductive flow meter with a measuring tube, which can be fitted into a pipeline system by using flange portions at the ends, with at least two measuring electrodes that are fitted into the wall of the measuring tube opposite each other in an electrically isolated manner and are intended for sensing a measuring voltage, a magnet unit, which is likewise arranged on the outside of the measuring tube, generating a magnetic field that is aligned substantially perpendicularly in relation to the direction of flow of the conductive flow medium to be measured, and the measuring tube being provided on the inside with means for the electric isolation of the measuring electrodes from the measuring tube, the means for the electric isolation taking the form of a thin inner coating of the measuring tube, the layer thickness of which lies in the range of 0.1-500 ?m.

Abstract: A magnetoinductive flowmeter for a medium (2), which is flowing through a measuring tube (1) and has a minimum electrical conductivity, having at least two electric coils (3a, 3b), which are arranged opposite one another on the measuring tube (1), for the purpose of inducing a magnetic field running essentially perpendicularly with respect to the longitudinal axis of the measuring tube (1), and having an electrode arrangement (4), which is likewise aligned essentially perpendicularly with respect to the longitudinal axis of the measuring tube (1) and essentially perpendicularly with respect to the magnetic-field axis, for the purpose of measuring a measurement voltage induced as a result of the flow of medium (2), the electric coils (3a, 3b) being accommodated such that they are sealed on the outside in each case one associated housing part (4a and 4b, respectively), which housing parts are in the form of hollow-cylinder segments and are mounted detachably on the measuring tube (1) by being joined together so

Abstract: An electromagnetic flowmeter designed to use a smaller excitation device and applicable to measurement on tubular channels of various sectional shapes. The electromagnetic flowmeter includes an excitation device for forming a magnetic field perpendicular to an outer wall of a tubular channel, and a pair of electrodes for measuring an electromotive force generated by the movement of the electroconductive fluid across the magnetic field. The electrodes and two magnetic poles of the excitation device are collectively placed on the outer wall at one side of the tubular channel.

Abstract: A method and device for obtaining an interference free measurement from a flowmeter. The flowmeter includes a measuring tube through which a flowable medium flows through a magnetic field generated by a magnetic arrangement and at least two measuring electrodes for detecting the measurement voltage induced by the flowable medium. The medium gives rise to interference voltages. The electrodes are connected to an interference-voltage eliminating unit by which common-mode interference is first eliminated by differentiation and unequal interference voltages are subsequently eliminated.

Abstract: A magnetoinductive flowmeter includes a measuring tube, a magnetic field device serving to generate and guide a magnetic field at least part of which permeates the measuring tube, and two electrodes for collecting a voltage induced in a medium as it flows through the measuring tube. The electrodes are so positioned, without connection to the magnetic field device, that their longitudinal axes extend at an angle diverging from zero relative to the direction of the voltage induction. In this uncomplicated fashion, a large effective electrode surface is made available for collecting the voltage induced in the medium. A method for producing the flowmeter is also described.

Abstract: A magnetic induction flowmeter has a plastic measuring tube (1), which can be inserted into a pipeline system, having at least two mutually opposite measuring electrodes (3) introduced into the wall of the measuring tube (1) in order to register a measuring voltage, a magnetic unit (2), likewise arranged on the outside of the measuring tube (1), generating a magnetic field aligned substantially at right angles to the flow direction of the conductive flow medium to be measured. The plastic measuring tube (1) is equipped with means for diverting axial and thrust forces which act from the outside on the measuring tube (1) inserted into the pipeline system, in order to keep destructive mechanical loadings away from the measuring tube (1).

Abstract: A magnetic induction flowmeter having a metal measuring tube (1), which can be inserted into a pipeline system via flanged sections (2a, 2b) at the ends, having at least two mutually opposite measuring electrodes (5a, 5b) introduced into the wall of the measuring tube (1) in an electrically insulated manner in order to register a measuring voltage, a magnetic unit (4), likewise arranged on the outside of the measuring tube (1), generating a magnetic field aligned substantially at right angles to the flow direction of the conductive flow medium to be measured, and the measuring tube (1) being provided with an electrically insulating layer (6) on the inside; in the region of the flanged sections (2a, 2b) at the end of the measuring tube (1), an expanded lattice (7) being fixed to the measuring tube (1), to which lattice the insulating layer (6) is applied in such a way that the expanded lattice (7) located within the insulating layer (6) ensures a firm connection between insulating layer (6) and measuring tube

Abstract: A flow meter filter system (200) according to an embodiment of the invention includes a noise pass filter (203) configured to receive a first version of a flow meter signal and filter out the flow meter data from the flow meter signal to leave a noise signal, a noise quantifier (204) configured to receive the noise signal from the noise pass filter (203) and measure noise characteristics of the noise signal, a damping adjuster (205) configured to receive the noise characteristics from the noise quantifier (204) and generate a damping value based on the noise characteristics, and a filter element (206) configured to receive a second version of the flow meter signal and receive the damping value from the damping adjuster (205), with the filter element (206) being further configured to damp the second version of the flow meter signal based on the damping value in order to produce a filtered flow meter signal.

Abstract: An insert for an electromagnetic flow meter is disclosed. The insert is arranged to be positioned within a flow conduit having a flow conduit cross-section to define a flow path for fluid, wherein the insert comprises an inlet, a measuring section with a measuring cross-section different from the flow conduit cross-section and having at least two substantially parallel sides over at least part of its length, and an outlet.

Abstract: A device for measuring fluid flow rates over a wide range of flow rates (<1 nL/min to >10 ?L/min) and at pressures at least as great as 2,000 psi. The invention is particularly adapted for use in microfluidic systems. The device operates by producing compositional variations in the fluid, or pulses, that are subsequently detected downstream from the point of creation to derive a flow rate. Each pulse, comprising a small fluid volume, whose composition is different from the mean composition of the fluid, can be created by electrochemical means, such as by electrolysis of a solvent, electrolysis of a dissolved species, or electrodialysis of a dissolved ionic species. Measurements of the conductivity of the fluid can be used to detect the arrival time of the pulses, from which the fluid flow rate can be determined. A pair of spaced apart electrodes can be used to produce the electrochemical pulse.

Abstract: A method for calculating the temperature of a medium traveling through a measuring tube, while with the aid of at least one field coil a magnetic field is generated which permeates the measuring tube. The electrical resistance of the field coil is measured and the temperature of the field coil, constituting a first temperature, is calculated based on the measured resistance of the field coil. A temperature measurement, constituting the second temperature, is taken at a location other than that of the field coil and the temperature of the flowing medium is calculated on the basis of the first and second temperatures. This provides the user of the flow measuring method an added benefit in that it gives the possibility, in simple fashion, to determine the temperature of the flowing medium. A flowmeter for measuring the medium temperature according to the method is also disclosed.

Abstract: An electromagnetic flow meter is configured as an insert for insertion into an in-situ housing connected in a flow line. This can enable a body previously installed for use with an insert of a mechanical flow meter to be adapted for use with an insert of an electromagnetic flow meter without having to disconnect the body from a mains supply.

Abstract: A magnetoinductive flowmeter and a method for operating same utilizing a measuring tube through which flows an electrically conductive medium, as well as two measuring electrodes and a magnet with two field coils positioned parallel to each other on mutually opposite sides of the measuring tube. The measuring electrodes are so positioned that their connecting line extends along an essentially perpendicular vector relative to the direction of flow and to the magnetic field as well as through the cross-sectional center of the measuring tube. For normal flow-measuring operation, the two field coils are so energized that an essentially homogeneous magnetic field is generated, permeating the medium flowing through the measuring tube, while for determining the flow rate the voltage present between the two measuring electrodes is collected at one or both measuring electrodes and measured against a reference potential.

Abstract: A magnetic flow metering device and method is disclosed for the measurement of corrosive flow streams. The device utilizes a unibody construction wherein the flow conduit is constructed entirely from an insulative, non-conducting material without resorting to a metallic outer housing. The portions of the electrodes in contact with the flow stream are made of a suitable conductive polymer material, resistant to the corrosive media. The electrodes also feature shields that are molded into the electrode assembly to reduce background electrical noise. The invention also utilizes an electrical configuration that actively drives the electrode shield circuit (electrodes as well as cabling) to provide a more accurate measurement of the electromotive force.

Abstract: Startup and operational techniques for a digital flowmeter are described. The techniques select an optimal mode of operation for the digital flowmeter, depending on a current environment of the flowmeter. 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, as part of a feedback loop. Once an oscillation of the flowtube is achieved and analyzed, a digital synthesis mode of operation may be implemented, in which the analyzed sensor signals are used to synthesize the drive signal.