Fischer & Porter Company

Fischer & Porter Gmbh

Hans W Schwiderski

Peter Nissen

Dieter Keese

Jorg Herwig

Karl H Rackebrandt

An apparatus for measuring the flow of fluid through a substantially horizontal measuring tube includes coils for producing two states of a magnetic field in which the magnetic fields extend through the measuring tube in a horizontal plane. The magnetic field in a first state extends through a first horizontal plane which intersects the measuring tube in substantially the same direction on both sides of the horizontal plane and in a second state extends in substantially opposite directions on both sides of the first horizontal plane. A pair of electrodes arranged at the measuring tube senses displacement of changes in the fluid and an electrical circuit corrects the voltage Ur between the electrodes in the first state of the magnetic field by using the voltage Ug between the electrodes in the second state of the magnetic field to obtain an output signal substantially proportional to the flow of the fluid. The electrodes are located in a second horizontal plane which is offset relative to the first horizontal plane so that an unambiguous relation exists between the voltages Ug and Ur on the one hand and the flow of the fluid on the other hand. Furthermore, the relation is dependent on the flow of the fluid but independent of the flow profile of the fluid.

Apparatus for measuring the flow of a fluid flowing through a measuring

A circuit for detecting faults in a magmeter system in which an electrically conductive fluid flows which is maintained at a reference potential. The circuit includes at least two electrodes in contact with the fluid. The electrode signals are conducted to the corresponding inputs of a measuring circuit. An alarm circuit is connected ahead of the measuring circuit. A difference in the magnitude of the values (+U.sub.S and -U.sub.S) of the electrode signals and/or non-symmetries in the noise content of the electrode signals and/or a disturbance in the high frequency signal (U.sub.G) in a loop which contains the electrodes and a high frequency producing generator causes an alarm to be activated.

Magnetic flowmeter with fault detection

A liquid flow measuring system which, by means of a suitable timing sequence, is able to detect unbalanced voltage generation which occurs when the tube element through which the liquid is flowing is not completely full and, by means of a correction process, supplies an output signal which is proportional to the rate of flow. When the tube element is full, the system operates in the same way as a normal magnetically inductive flowmeter. If the level in the tube element falls, electrodes which are installed in the lower half of the tube element and other electrodes, if necessary, can be used exclusively or additionally to record the measured values. Moreover, with a view to improving the recording of measured values when the level falls below a specific limit, an arrangement of electromagnets, specially optimized for partially filled tube elements, can be activated instead of the normal arrangement of electromagnets.

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Norten-Hardenberg, Germany

Hans W Schwiderski