DE2743954C2 - Circuit arrangement for measuring the flow of a liquid containing electrical charges - Google Patents

Description

memory 9 with opposite polarity of the electromagnets la, 26 and lead to a signal memory 10 with the electromagnet 2b switched off. The signals stored in the signal memories 8, 9 and 10 are processed in a correction circuit 12 by means of empirical parameters, so that a signal appears at the output 14 of the correction circuit 12 which is essentially caused by disturbances in the flow profile in the pipe section 1, in particular deviations in the flow profile from of rotational symmetry, is free

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Claims (1)

1 2 and the measured values achieved in each case in the sense of a Claim: to combine compensation for the errors contained in them. A corresponding circuit arrangement is Circuit arrangement for measuring the current also known from DE-OS 20 52 175 liquid containing electrical charges, 5 The errors to be compensated are based on The one at least on the inside made of electrically insulating on that the current density of the electrical charges Existing material pipe section (1) containing liquid above the measuring section in the flows, with two magnets (2a, 2b), of which little pipe is not evenly distributed at least one is an electromagnet, for generating an object of the invention is to provide a circuit arrangement nes to indicate the flow essentially diametrically to the pipe ion according to the preamble of the claim, piece (1) penetrating magnetic field and with two the particularly large errors caused by a rotation from charge shifts in the liquid functional asymmetry of the current density in the pipe- influenced electrodes (3a, 3b), whose mean calls are to be compensated in the measured values. Bonding line (X) essentially diametrically equips the current central to the pipe section (1) and essentially right specified at an angle to the middle connecting line (Y) between claim. the magnet (2a, 2b) passes through, in which the spatial distribution of the magnetic field relative to the distribution arrangement according to the invention is based on the following:
spatially fixed flow profile If the current density is to be changed in the vicinity of the excited magnet of the current and from the changes in the process is greater than at a corresponding point in the vicinity of the switched off electromagnet from the electrodes (3a, 3b), so is the measured voltages is to derive a signal corresponding to the tapped from the electrodes measuring voltage greater current to be measured, in which at fixed than in the reverse Fail While shutdown of an arrangement of the magnets (2a, 2b) and the electrodes electromagnet depends therefore of the Electrodes (3a, 3b) relative to the pipe section (1) to obtain 25 tapped measurement voltage also, as in the case of opposing at least two measurement voltages the degree of polarity of the magnets is changed by deviations in the excitation of the electromagnet (2b) . and in the case of the measuring voltages in the at least ren position. Both of these voltages result in two states of excitation of the electromagnet (2b) Correction of the measuring voltage is used, which are stored by the Elekentsprecher.de signals, since - 30 trodes with rectified polarity of the magnets marked by that the scanning is done. one of disturbances mean flow profile in the pipe order without changing the device the number of piece (1) essentially freed output signal measurement voltages that are used for correction A clock generator (11) can be provided from these signals, and the other is also preferred the one hand 35 magnet is designed as an electromagnet in a predetermined cycle sequence and is used for a polarity reversal switch (4) and a switch (5) for obtaining further measurement voltages operated as the electromagnet (2b) switches and on the other hand this is explained for the first-mentioned electromagnet a switch (7) switches the one that was used by the electrodes. (3a, 3b) measured voltages in three The invention is described below on an execution memory (8,9,10) which explains the three switching states 40 approximately example with reference to the drawing of the electromagnet (2b), namely excitation in the die The drawing shows schematically in cross section in one direction, excitation in the other direction, at least on the inside of electrically insulating Makeine excitation, and that the outputs materially existing pipe section 1 and two electromagnets of these memories (8,9,10) to a correction circuit te 2a, 2b for generating a pipe section 1 in far 2) are connected, which diametrically penetrates the stored signals 45. Two Ie electrodes 3a, 3b , processed by means of empirical parameters to the output of charge shifts in the liquid leg signal, are located in such a way that their middle ones Line X connects the stream essentially diametrically tral to the pipe section 1 and essentially at right angles 50 to the middle connecting line Y between the magnets 2a, 2b penetrated. The electromagnet 2a is directly The invention relates to a circuit arrangement for remotely connected to a supply device 13. The measurement of the current of an electrical charge contained. Electromagnet 2b is connected to the supply device 13 with liquid according to the preamble of the approach to the electromagnet 2a via a polarity reversal switch. 55 4 and a switch 5 switched. It is obvious. In a circuit known from DE-OS 20 63 792 that, with a suitable change in the circuit, the electrical arrangement of this type, it is known that the magnet magnet can also be connected in series between a field at right angles to the direction of current and that to change the excitation of the Electrically at right angles to the connecting line between the electromagnets 2a or the electromagnets 2b , one electrode running direction and one direction running in the current direction, which is provided in the auxiliary winding on the electromagnet, can be changed and which can be the one for exciting the main winding in each case from the Electrodes removed measurement causes opposite polarity excitation. The electrodes 3 a, 3 b values to be multiplied to compensate for disturbances are connected to a signal amplifier 6, the ren. Output of which is connected to a signal splitter 7. In a known from US-PS 35 50 446 switch 65 clock generator 11 switches synchronously the polarity reversal switch 4 processing arrangement, it is known, a perpendicular to and the switch 5 to output channels of the signal flow direction and perpendicular to the connecting line soft 7, which to a Signal memory 8 with the same sense electrodes running magnetic field umzupolen ger polarity of the electromagnets 2a, 2b, to a signal