An oscillating analog signal includes a succession of dampened oscillations. That oscillating analog signal is conditioned to generate an output signal including only oscillations of the oscillating analog signal which have an amplitude smaller than a first threshold. The output signal is then processed by a processing unit, where the first threshold is compatible with a maximum level of voltage tolerable by the processing unit.

A magneto-inductive flow measuring device (1) comprising a measuring tube (2) on which a magnet system and two or more measuring electrodes (3) are arranged and/or secured, wherein the measuring tube (2) has in- and outlet regions (11, 12) with a first cross section and wherein the measuring tube (2) has between the in- and outlet regions (11, 12) a middle segment (10), which has a second cross section, wherein the measuring electrodes (3) are arranged in the middle segment (10) of the measuring tube (2), wherein the middle segment (10) at least in the region of the measuring electrodes (3) is surrounded by a tube holder (15), which guards against cross-sectional deformation of the second cross section.

A magneto-inductive flow measuring device (1) comprising a measuring tube (2) on which a magnet system and two or more measuring electrodes (3) are arranged and/or secured, wherein the measuring tube (2) has in- and outlet regions (11, 12) with a first cross section and wherein the measuring tube (2) has between the in- and outlet regions (11, 12) a middle segment (10), which has a second cross section, wherein the measuring electrodes (3) are arranged in the middle segment (10) of the measuring tube (2), wherein the middle segment (10) at least in the region of the measuring electrodes (3) is surrounded by a tube holder (15), which guards against cross-sectional deformation of the second cross section.

An electromagnetic flow meter includes a flowtube including a coil disposed in the vicinity of a measurement tube, and electrodes disposed on the measurement tube, a converter including an excitation unit configured to generate an excitation signal and output the excitation signal to the coil through an excitation cable, and a detection signal receiving unit configured to receive a detection signal from the electrodes through a signal cable, and generate a flow rate signal, and a miswiring detection unit configured to perform miswiring diagnosis on the excitation cable or the signal cable on the basis of a difference between a change amount of the flow rate signal when the excitation signal is being output and a change amount of the flow rate signal when the excitation signal is not being output.

An electromagnetic flow meter includes a flowtube including a coil disposed in the vicinity of a measurement tube, and electrodes disposed on the measurement tube, a converter including an excitation unit configured to generate an excitation signal and output the excitation signal to the coil through an excitation cable, and a detection signal receiving unit configured to receive a detection signal from the electrodes through a signal cable, and generate a flow rate signal, and a miswiring detection unit configured to perform miswiring diagnosis on the excitation cable or the signal cable on the basis of a difference between a change amount of the flow rate signal when the excitation signal is being output and a change amount of the flow rate signal when the excitation signal is not being output.

A method for defect detection for a signal line between an electrode and a measuring- and/or evaluation unit of a magneto-inductive flow measuring device having at least one measuring- and/or evaluation unit, as well as a measuring tube with at least two measuring electrodes and a third electrode, comprising steps as follows: A) ascertaining a ratio of at least two measured electrical impedances between the measuring electrodes and/or between at least one of the two measuring electrodes and the third electrode; B) comparing the impedance ratio with a desired value range and C) outputting a defect report, when the impedance ratio exceeds or subceeds the desired value range, and a magneto-inductive flow measuring device.

A method for defect detection for a signal line between an electrode and a measuring- and/or evaluation unit of a magneto-inductive flow measuring device having at least one measuring- and/or evaluation unit, as well as a measuring tube with at least two measuring electrodes and a third electrode, comprising steps as follows: A) ascertaining a ratio of at least two measured electrical impedances between the measuring electrodes and/or between at least one of the two measuring electrodes and the third electrode; B) comparing the impedance ratio with a desired value range and C) outputting a defect report, when the impedance ratio exceeds or subceeds the desired value range, and a magneto-inductive flow measuring device.

An electromagnetic flowmeter has a flowtube configured to carry a conductive fluid. The flowtube has wall made of a conductive material. The wall has an inner surface surrounding a fluid flow path for the fluid. A non-conductive liner is positioned to electrically insulate the flowtube wall from the fluid. The flowtube and non-conductive liner define an electrode mounting hole. An electrode extends through the electrode mounting hole. The electrode and the non-conductive liner form a fluidic seal between the electrode mounting hole and the fluid flow path. At least a portion of the electrode is arranged in fluid communication with the flowtube within the electrode mounting hole. A short circuit detector can detect failure of the seal when conductive fluid that has leaked past the seal creates a short circuit as a result of the fluid communication between the flowtube and the electrode mounting hole.

An electromagnetic flowmeter has a flowtube configured to carry a conductive fluid. The flowtube has wall made of a conductive material. The wall has an inner surface surrounding a fluid flow path for the fluid. A non-conductive liner is positioned to electrically insulate the flowtube wall from the fluid. The flowtube and non-conductive liner define an electrode mounting hole. An electrode extends through the electrode mounting hole. The electrode and the non-conductive liner form a fluidic seal between the electrode mounting hole and the fluid flow path. At least a portion of the electrode is arranged in fluid communication with the flowtube within the electrode mounting hole. A short circuit detector can detect failure of the seal when conductive fluid that has leaked past the seal creates a short circuit as a result of the fluid communication between the flowtube and the electrode mounting hole.

Methods, apparatuses, and embodiments related to estimating void fractions in real-time or substantially real-time without disrupting a production flow of, e.g., a geothermal power plant. Some embodiments describe methods and systems of determining void fraction of a two-phase mixture extracted from a geothermal well by measuring the attenuations of one or more radiofrequency signals in a fixed span of a transportation unit (e.g., a pipe). Depending on void fraction of the two-phase mixture in the transportation, the RF signals would attenuate differently across the fixed span. For example, a monitor system can utilize one or more transmitter antennas in the transportation unit to transmit one or more RF signals and utilize one or more receiver antennas to measure attenuations of these RF signals over the fixed span. In some embodiments, an antenna can be configured to serve as both a transmitter antenna and a receiver antenna.