摘要:
The invention relates to a method and a device for measuring a flow of liquid based on a contact resistance measurement working inside the flow, containing a high degree of precision and robustness and characterised by a low cost price, simple subsequent assembly and easy cleaning. According to the invention, the liquid is vertically scanned e.g. by means of segmented electrodes or optical systems having vertical resolution, only one section of the vertical segments is scanned for effective use of the measuring device. The vertical segments which are to be scanned are derived from the post values of the scanning and from a reference profile which contains, for example the number of phases in the flow of liquid.
摘要:
A measurement assembly for determining an electrical resistance of a fluid in a wellbore is provided. The measurement assembly can include a non-conductive frame, comprising an excitation electrode and a monitoring electrode coupled to the non-conductive frame. The measurement assembly can also include a central electrode in a flow path for the fluid, wherein the flow path is defined by the non-conductive frame. The central electrode can be positioned for conductively coupling the excitation electrode and the monitoring electrode through a conductive path defined by the fluid. Further, the measurement assembly can include a power source for transmitting power to the excitation electrode for determining the electrical resistance of the fluid. The electrical resistance of the fluid can be used to determine whether the fluid includes oil, water, or gas.
摘要:
A conductivity sensor is described in which electrodes are held in a desired position within a housing of the sensor by a number of slots accurately positioned within the housing. In one embodiment the slots are integrally formed within the housing. Once the electrodes have been inserted into the slots a thermoset resin is poured into the housing and cured. A through bore is then drilled through the housing, the electrodes and the cured resin to form a flow conduit through the sensor. A dual frequency excitation technique is also described that allows a measurement to be obtained of a polarisation resistance of the electrodes. In one embodiment this measurement is stored and used to correct subsequent conductivity measurements.
摘要:
A conductivity sensor is described in which electrodes are held in a desired position within a housing of the sensor by a number of slots accurately positioned within the housing. In one embodiment the slots are integrally formed within the housing. Once the electrodes have been inserted into the slots a thermoset resin is poured into the housing and cured. A through bore is then drilled through the housing, the electrodes and the cured resin to form a flow conduit through the sensor. A dual frequency excitation technique is also described that allows a measurement to be obtained of a polarisation resistance of the electrodes. In one embodiment this measurement is stored and used to correct subsequent conductivity measurements.
摘要:
The present invention relates to a method for determining the composition of medical liquids as regards their proportion of electrolytes and non- electrolytes, said method comprising the following steps: determining at least one first physical parameter of the medical liquid for unequivocal determination of the proportion of non-electrolytes in the medical liquid; simultaneously determining at least one second physical parameter of the medical liquid for determination of the proportion of electrolytes in the medical liquid; and determining the proportion of electrolytes and non- electrolytes in the medical liquid on the basis of the first and second physical parameters. The present invention further relates to a device for determining the composition of medical liquids as regards their proportion of electrolytes and non-electrolytes, said device comprising a first measuring device (7) for measuring a first physical parameter of the medical liquid that is in a defined ratio to the non-electrolyte in the medical liquid, a second measuring device (8) for determining at least one second physical parameter of the medical liquid that is in a ratio to the proportion of electrolytes in the medical liquid, and an evaluation device (9) for determining the proportion of electrolytes and non-electrolytes in the medical liquid on the basis of the measured values of the first measuring device (7) and of the second measuring device (8).
摘要:
Characteristics of a fluid are determined, in one embodiment, by flowing the fluid (which may contain charged particles) between a plurality of electrode pairs, applying respective DC voltages across at least two of the electrode pairs, and measuring resulting currents through the fluid at the respective electrode pairs. In one example, respective plates of the electrode pairs are configured so that they do not fully encircle one another.
摘要:
Beschrieben und dargestellt ist ein magnetisch-induktives Durchflussmessgerät, mit mindestens einem Messrohr (1) für den Durchfluss eines elektrisch leitenden Mediums, mit mindestens einer Magnetfelderzeugungseinrichtung zur Erzeugung eines zumindest auch senkrecht zur Längsachse des Messrohrs (1) verlaufenden wechselnden Magnetfeldes, wobei die Magnetfelderzeugungseinrichtung zwei Magnetfeldspulen (2, 3) aufweist, mit mindestens zwei - insbesondere das Medium berührenden - Messelektroden (4,5). Zu diesem magnetisch-induktiven Durchflussmessgerät gehören auch, aber nicht dargestellt, eine an die Messelektroden (4, 5) angeschlossene Signalspannungsquelle oder Signalstromquelle zur Erzeugung von Leitfähigkeitsmesssignaten, eine Steuerschaltung für die Magnetfelderzeugungseinrichtung und für die Signalspannungsquelle oder die Signalstromquelle sowie eine Auswerteschaltung. Das erfindungsgemäße magnetisch-induktive Durchflussmessgerät ist dadurch verbessert, dass die Steuerschaltung oder / und die Auswerteschaltung so ausgeführt ist bzw. sind, dass nur während einer Durchflussmesszeit, die kleiner ist als die halbe Periodendauer der Magnetfelderzeugung, die von den Messelektroden (4, 5) abgegriffene bzw. abgreifbare Messspannung für die Durchflussmessung ausgewertet wird, und dass die Steuerschaltung so ausgeführt ist, dass nur während einer Leitfähigkeitsmesszeit, die außerhalb der Durchflussmesszeit liegt, die Messelektroden (4, 5) mit Leitfähigkeitsmesssignalen beaufschlagt werden.
摘要:
Techniques are provided for measuring one or more parameters in a multi-phase metering system. The multi-phase metering system includes a transport structure configured to transport one or more flow components of a flow process. Electrodes may be disposed concentrically with a cross-section of the transport structure to determine parameters of fluids flowing through the cross-sectional area. The multiphase metering system includes measurement electronics having measurement circuitry including a balance load having an impedance that is substantially equal to a parasitic impedance of the multi-phase metering system. The measurement electronics also includes a processor suitable for determining one or more parameters, such as flow velocity, flow volume, etc., based on a current sensed by the measurement circuitry.