A method for setting a constant magnetic field strength of a magnetic field within a commutation interval using a magnetic-inductive flowmeter having a current controller with which time for setting the constant magnetic field strength of a magnetic field is relatively shorter. Additionally, a first interval having a starting point in time and an ending point in time and a second interval having a starting point in time and an ending point in time are arranged within a commutation interval. A first setpoint current curve for the first interval differs by a difference current curve to effectuate a higher rate of change. A second setpoint current curve is assigned to the constant setpoint current. The current controller is fed the first and second setpoint current curves.

A sensing and controlling module of airflow for an active aerosol suction device has a tube, a sensing membrane, a sensing coil, a controlling membrane, a controlling coil, and a magnetic unit. The sensing membrane is mounted in the tube. The controlling membrane is disposed at an air inlet of the tube. The sensing membrane and the controlling membrane are capable of bending deformation. The sensing coil is adhered to and spread on the surface of the sensing membrane, and the controlling coil is adhered to and spread on the surface of the controlling membrane. The magnetic unit is disposed at a spaced interval from the sensing membrane and the controlling membrane. With the sensing membrane and the controlling membrane, the sensing and controlling module is capable of sensing and controlling airflow rate.

An in-line flowmeter sensor device and an in-line flowmeter are configured to be arranged in-line with a conduit supporting a multi-phase fluid flow including first and second matter groups. The second matter group has a lower density than the first matter group. The sensor device includes: an inlet and an outlet arranged at respective ends of the flowmeter sensor device; and a measurement chamber arranged between the inlet and the outlet. The measurement chamber is configured to split the first and second matter groups into first and second flow regions, respectively, of the measurement chamber. A flow meter sensor element is arranged in or adjacent the first region.

Methods and devices for measuring fluid properties include an electromagnetic sensor. The electromagnetic sensor includes a coaxial probe body having a first integral pressure barrier and a second integral pressure barrier formed from coaxial-feedthrough connector. The first integral pressure barrier and the second integral pressure barrier have a desired characteristic impedance.

A method for setting a constant magnetic field strength of a magnetic field within a commutation interval using a magnetic-inductive flowmeter having a current controller with which time for setting the constant magnetic field strength of a magnetic field is relatively shorter. Additionally, a first interval having a starting point in time and an ending point in time and a second interval having a starting point in time and an ending point in time are arranged within a commutation interval. A first setpoint current curve for the first interval differs by a difference current curve to effectuate a higher rate of change. A second setpoint current curve is assigned to the constant setpoint current. The current controller is fed the first and second setpoint current curves.

A device for determining a flow-rate-dependent variable of a flowable and conductive medium in a guide body for guiding the medium includes a magnetic-field-generating device for generating a first magnetic field that separates mobile charge carriers in the medium and a magnetic-field-sensitive measuring arrangement for determining a second magnetic field that is generated by the mobile charge carriers. The magnetic-field-sensitive measuring arrangement includes a first magnetic-field-sensitive measuring device having a magnetic-field-sensitive and optically excitable material, an optical excitation unit for the optical excitation of the first magnetic-field-sensitive measuring device, and an optical detection unit for detecting a measurement signal that correlates with a change and/or a strength of the second magnetic field. An evaluation circuit is configured to determine the flow-rate-dependent variable, measurement signals of at least two different magnetic field states influencing the determination of the flow-rate-dependent variable.

Systems and components thereof are provided for analyzing multiphase production fluids. The system comprises a fluidic separation chamber, a fluidic separation chamber valve, fluidic piping configured to supply multiphase production fluid to the fluidic separation chamber through the fluidic separation chamber valve, a plurality of composite sensing modules vertically spaced within the fluidic separation chamber, and a fluidic supply and analysis unit. Each of the sensing modules comprising an inductive sensor comprising opposing inductive sensing elements displaced from one another across a vertically extending measurement portion of the fluidic separation chamber, and a capacitive sensor comprising opposing capacitive sensing elements displaced from one another across the vertically extending measurement portion of the fluidic separation chamber. The capacitive sensor of each of the plurality of composite sensing modules to detect a height H.sub.O of an oil phase column in the multiphase production fluid in the fluidic separation chamber.

Systems and methods for measuring EM field-carrying fluid flow use a difference in magnitude or phase of the field as the fluid flows. The difference indicates with fluid speed, and this relationship can be established beforehand, experimentally, or from the magnetic Reynolds number. Systems take advantage of the EM field, such as that created by a stator coil in an EM pump by detecting that field advected in the pumped fluid downstream. Magnitude or phase difference of the field, as reportable by a voltage in a conductive receiver reflects the flow rate, and thus speed, of the fluid between the initial and detected points. A computer or logic can thus readily output fluid rate, such as from a pump, from any electrical signal generated by the advected field. Systems do not require power, field induction, lengthy straight conduits, co-planar generators and sensors, flow interruptions, or large attachment or surrounding structures.