1616results about "Volume/mass flow by electromagnetic flowmeters" patented technology

An apparatus and a method is provided based on the Magnetic Resonance techniques to analyze and measure a uni- and/or a bi-directional flow regime of multiphase fluids in a transport and production conduct, in real time and flow-rates, based on a magnetic resonance analytical module, two magnetic prepolarization modules of variable effective length and a control computer of data acquisition and transfer, all associated to each other.

An electromagnetic flowmeter assembly is described in which an excitation field is set up across a flow conduit and electrodes are used to sense the electromagnetic field generated across the flow conduit as a result of interaction between the excitation field and fluid flowing along the flow conduit. The signals obtained from the electrodes are processed, together with stored calibration data, by processing circuitry to determine flow measurements and means is provided for dynamically updating the calibration data.

The present invention is a water use and/or a water energy use monitoring apparatus that is affixed to the hot and cold water supply piping for continuously (or on demand) monitoring displaying the water and water energy (hot vs. ambient) use within a residential or commercial building. A first wire or wireless means is incorporated to communicate with a remote display for viewing by the owner of a commercial building or occupier/resident of a home. A second optional wire or wireless means can be incorporated that can be monitored by civil, commercial, governmental or municipal operators or agencies, using a remote display and/or recorder means or by a secure wire or wireless communication network (e.g. cell phone, smart phone or other similar technology communication means). A third wireless means communicates water parameter data utilizing typical cell tower technology and/or mesh network technology. The water use monitor apparatus includes a power generation, a microprocessor, temperature and water flow sensors, optional water quality sensors, timing circuits, wireless circuitry, and a display means. A wired or wireless means is designed to electronically communicate water use, water energy use and/or water quality information to a remotely located display apparatus or typical cell phone, smart phones, or similar apparatus for convenient observation by a commercial, operator or occupier, resident, municipal or government agency.

A gas sample and conditioning device for sampling gas in a storage or transport device and conditioning the gas to avoid dew point dropout of the gas. A chamber for regulating the temperature and the pressure of the gas is provided with external A.C. or D.C. power using the leads of existing heat tracing cables to avoid the need for additional power sources to power the temperature and pressure regulating devices within the chamber.

The present invention determines the resonant frequency of a sensor by adjusting the phase and frequency of an energizing signal until the frequency of the energizing signal matches the resonant frequency of the sensor. The system energizes the sensor with a low duty cycle, gated burst of RF energy having a predetermined frequency or set of frequencies and a predetermined amplitude. The energizing signal is coupled to the sensor via magnetic coupling and induces a current in the sensor which oscillates at the resonant frequency of the sensor. The system receives the ring down response of the sensor via magnetic coupling and determines the resonant frequency of the sensor, which is used to calculate the measured physical parameter. The system uses a pair of phase locked loops to adjust the phase and the frequency of the energizing signal.

A process for curing a natural or synthetic rubber includes the measuring of curing conditions by dielectric or impedance means to produce a process curve (impedance property data versus time) followed by analyzing the process curve with a software algorithm which defines and statistically quantifies the correlation between the process curve and the desired part properties. The correlation relationship is applied in real time to end the curing process at the optimum time and to produce rubber parts of uniform quality and with reduced process cycle time.

The invention discloses a DSP-based electromagnetic flowmeter signal processing system, which comprises a hardware system and a software system. The hardware system consists of an excitation driving module, a signal modulation and acquisition module, a signal processing control module, a man-machine interface module, a communication module and a power supply management module. The signal control module uses DSP as a core. In the system, a high frequency square wave excitation control scheme is adopted, and the DSP generates an excitation time sequence to control the excitation driving module to perform high frequency square wave excitation of a magnet exciting coil; the signal modulation and acquisition module amplifies and filters an output signal of an electromagnetic flowmeter, performs the analog-to-digital conversion of the output signal and outputs the output signal to the DSP; the software system processes an acquired signal to obtain a flowmeter measurement result and send the result to a liquid crystal display; and the parameters of the flowmeter are set by keyboard operation or by the interaction between a master computer and the flowmeter by the communication module. The system can realize the high-accuracy and high-speed measurement of fluid flow, particularly the measurement of flow of liquid-solid two-phase fluid such as pulp.

An improvement over conventional electromagnetic flowmeters which signal a measure of flow rate by controlling the current in a current signalling loop (also known as a sensing loop) and in which power for the flowmeter is derived from the current in the signalling/sensing loop. Conventional electromagnetic flowmeters use a standard current range (typically 4-20 mA), in which zero flow is indicated by controlling the current in the loop to a minimum predeterimened value and maximum flow is indicated by controlling the current to a maximum predetermined value. In the improved flowmeter of the invention, minimum flow is signalled by maximum current in the signalling/sensing loop and maximum flow is signalled by minimum current. This has been found to enable improved accuracy to be obtained at low flow rates without requiring complex flowmeter circuitry.

An magnetic flow meter is provided which includes a reference electrode configured to electrically couple process fluid flowing within a flowtube of the flow meter. The reference electrode is adapted to measure potential of the process fluid. A current limiter is configured to limit current flow through the reference electrode and thereby reduce corrosion of the reference electrode.

Methods and systems are described for determining a flow rate of a gas-liquid fluid mixture in a conduit. In the described systems and methods, the fluid mixture is conditioned so that the liquid in the mixture is separated from the gas in the mixture. Properties of the conditioned flow may then be measured to determine the flow rate. In an embodiment of the invention, the hold up of the separated liquid is measured; the velocity of the separated liquid is measured; the velocity of the separated gas is measured; and the flow rate of the gas-liquid fluid mixture is determined from the hold up and the velocities.

The invention relates to an electromagnetic flow meter excitation control system based on high and low voltage power switching, comprising a high voltage power and a low voltage power, a power switching circuit, a constant-current control circuit, a filed coil driving circuit, a current detecting circuit and an excitation timing sequence generation circuit. An excitation working power is provided by switching the high voltage power and the low voltage power via the power switching circuit according to excitation current response situation in a time sharing manner so as to quicken the response speed of square wave excitation current and improve power utilization ratio; the constant-current control circuit supplies power to the filed coil driving circuit so as to cause the steady-state value of the excitation current to be constant; the filed coil driving circuit is composed of an H bridge and a control circuit thereof to realize square wave excitation; the current detecting circuit is bridged between the lower end of the H bridge and reference ground; and the excitation timing sequence generation circuit is mainly composed of an processing core MCU for processing the signals of the electromagnetic flow meter, and the like. The excitation control system can obviously enhance the range of excitation frequency, lower circuit energy consumption and improve power utilization efficiency in the condition of ensuring the stable zero point of the electromagnetic flow meter, so as to be applicable to accuracy measurement of size fluid.

The invention relates to a mono-dual frequency electromagnetic flowmeter excitation control system based on linear power supply, comprising a constant current source circuit, a current bypass circuit,an exciting coil driving circuit, an excitation time sequence generating circuit and a galvo circuit. A high voltage power supply is adopted for supplying power, the constant current source is constructed by linear power supply to supplying electricity for the exciting coil driving circuit, the current bypass circuit is jointed in parallel with the input/output end of the linear power supply to solve the problem of energy dissipation, the exciting coil driving circuit is composed of an H bridge and a control circuit thereof, the galvo circuit is bridge-jointed between the lower end of the H bridge and a reference ground, and a digital signal processor (DSP) is used for controlling multiple switches and an electrical level matching device to generate time sequence and control the action ofthe exciting coil driving circuit. The excitation control system can obviously improve excitation frequency range and excitation frequency preciseness, is suitable for single frequency high frequencysquare wave excitation or dual frequency square wave excitation, and can simultaneously provide more exact current detection to correct the flow signal processing result.

A flow rate measuring apparatus can reduce flow rate detection errors resulting from a temperature difference between an inside and an outside of piping. A base has a base main body which is formed at its base end with a connector protruding to the outside of the piping, and a flange which is formed on the base main body and is fitted into an insertion hole in the piping. A plate made of PBT resin is arranged on the base, and a flow rate detection element is formed on the plate so as to be exposed therefrom. A circuit board is arranged at a side of the plate opposite to the connector. A housing has a fluid passage groove that cooperates with the plate to form a measuring passage in which the flow rate detection element is disposed, and an enclosure portion enclosing the circuit board. A cover closes the enclosure portion.

A passive flowmeter having an inlet, sensing passage and outlet in fluid communication with one another, the sensing passage having a noncircular cross-section having a minor axis generally aligned with a permanent magnetic field and a major axis generally aligned with at least a pair of generally opposed electrodes for detecting a flow-dependent voltage induced by the passage of conductive liquid through the magnetic field. By using both permanent magnets and a noncircular cross-section sensing passage together in the same device, much greater latitude in magnet selection may be obtained. This may facilitate for example the use of lower cost permanent magnets and the construction of a lower cost device for disposable flowmeter applications.

The invention discloses a multi-electrode electromagnetic flow meter and relates to the technology field of measurement. The flow meter comprises six electrodes arranged on the circular cross-section of a sensor conduit, the sensor conduit is perpendicular to the central axis of the conduit, wherein, four electrodes are measuring electrodes that are symmetrical about the X-axis and the Y-axis of the circular cross-section, and two electrodes are liquid collecting electrodes. Two measuring electrodes are in a group, the two liquid collecting electrodes are arranged between the two groups of measuring electrodes. The two measuring electrodes in a group are reliably connected. The two groups of measuring electrodes are respectively connected with a converter and an amplifier. The two liquid collecting electrodes are reliably connected and then connected to the metal of a measuring conduit, and serve as the basis ground of flow signals for connecting the ground terminal of the converter and the amplifier. The multi-electrode electromagnetic flow meter is characterized by small additive measuring error, convenient assembly and reliable liquid collecting reference, and can provide the reliable ground reference electrical potential.

A magnetic flowmeter transmitter includes a differential amplifier that senses an additive combination of actual flowmeter electrode outputs and simulated electrode outputs. The differential amplifier provides an additive amplifier output. A simulator provides the simulated electrode outputs. The simulator senses the additive amplifier output and provides an error indication when the additive amplifier output is outside a normal range.

An electromagnetic flowmeter for measuring a flow rate of a fluid in a pipe is described. A pipe carries a fluid. A magnetic coil is disposed adjacent to the pipe for inducing a magnetic flux in the fluid. A plurality of electrodes are disposed within the pipe, and the plurality of electrodes are electrically isolated from one another. Measurement circuitry is coupled to at least one of the plurality of electrodes and is configured to measure flow rate as a function of a potential across the plurality of electrodes. An empty pipe detector is coupled to at least one of the plurality of electrodes and is adapted to detect an empty pipe condition based upon an adjustable test criteria. In one embodiment, a local operator interface is coupled to the empty pipe detector for adjusting the adjustable test criteria.