SU903712A1 - Electromagnetic consumption converter graduation method - Google Patents

Description

I

The invention relates to the calibration of electro-magnetic flow meters and may be used in experimental and industrial installations with liquid metals.

. It is known to measure the flow rate of electrically conductive liquids by means of electromagnetic flow transducers, based on the measurement of emf, which is indicated in an electrically conductive fluid, the motion of the latter in a magnetic field.

Electromagnetic transducers of low flow rates of liquid metals are known, containing a magnetic system surrounded by a multi-turn pipeline, between the turns of which there are electrodes electrically connected in series to sum the electromotive voltage, which are electromotive. each turn of the pipeline is an elemental flow converter O.

The disadvantage of imereni fluid flow with the help of electromagnetic pre

consumption makers is the need for their periodic grading

A well-known volumetric method of graduation of electromagnetic flow formers, which consists in the fact that, when pumping an electrically conductive liquid through a filled pipe carrier, the flux generator is filled with a liquid, the measuring capacity of a known volume, with the help of level gauges, the beginning and end are fixed.

to fill the measuring tank, determine the filling time of the measuring tank, and determine the flow rate through the pre. flowmaker. Comparison of the output signal of the converter with the stroke gives a calibration characteristic of the flow converter 2.

Claims (2)

The disadvantage of this method is that it requires, for example, with specially equipped flow meters 20. Therefore, it is not possible to re-calibrate under operating conditions. In order for ipoBGCTH to re-schedule the flow generator, the flow generator is removed under operating conditions and is installed on the flow meter bench. The purpose of the invention is to simplify the calibration, namely the calibration of the flow transducers at the place of their use while maintaining the accuracy that the volumetric method of calibration provides. This goal is achieved by the fact that. the calibration of electromagnetic flow transducers, the output voltage of which is the sum of the output voltages taken from h consecutively connected electrode pairs, consisting in 1 pumping the flow of electrically conductive fluid through the conduit of the transducer of the flow and measuring the output voltage of the flow converter; 1P) is produced before the pipeline has been emptied, and the time interval between the occurrence of the signal from the first and the last along the direction is fixed. The flow of a pair of electrodes and for this time interval of filling a known volume of the pipeline between the first last pair of electrodes determine the flow rate. FIG. 1 shows a flow transducer, the calibration of which can be carried out using the proposed method; in fig. 2 - graduation scheme; in fig. 3 and 4 are the theoretical and experimental functions of varying the output voltage over time. The magnetic system is formed by a direct permanent magnet with a 1st cylindrical magnetohydrophore 2. The magnet is located inside the magnetic core so that air gaps are formed between its poles and the magnetic core 3 | The KOTOpbix has a pipework for the converter 4. The magnet is made of a thermostable UND35T5BA thermometer and is operational for a long time at temperatures up to 870 K. it is unified with the help of patrukov 7. The converter pipe is made in the form of a cylindrical spiral located between the magnet and the magnetic core in such a way that each turn passes through both air gaps of the magnetic system and forms, as it were, two independent elementary converters. The total voltage materated flow rate is q times the elementary transducer, where y is the number of turns of the helix. The graduation is carried out according to the scheme shown in (| dag. 2. According to the calibration method, the measuring capacitance is the working flow tubeter of the flow former from the first pair of electrodes to the last. The volume of the pipe blower 1 of the former is measured using measuring instruments with high accuracy. The metal enters tank 3 of the time delay, the volume of which is chosen in such a way that the transitional process associated with the opening of the gate valve has ended. After the time delay tank is filled, the metal enters the flow mapper 9 and the output aeaer is registered by the help of an H-115 loop oscilloscope with the first, second, and so on. a pair of electrodes preozatel In this case, the output voltage is varied in steps (fkg. 3). According to the consignment diagram, the period of time between the first and the last pair of electrodes is 10). The typing record of the output of the NIN 1paragraph in the calibration process is shown in FIG. 4. It can be seen from the output that the output voltage abruptly changes & changes at the time of the first liquid of each pair of electrodes relative to a separate elementary transducer, and the way it significantly fills the electrically operated (agnatnym flow meters without using expensive expensive cushioning towers and any of the same beads would not have any way to do this. on the fimer, when calibrating low-flow electromagnetic schzifoobrazovateley. The formula of the invention., Cifoco6 calibration of electromagnetic flow transducers, the output non-voltage of which is the sum Output voltages are removed from and in series with the electrode pairs, which consist in pumping the flow rate of the electrically conductive fluid through the flow meter pipeline and measuring the output of the drive flow meter, characterized in that, in order to mitigate the graduation, the fluid is pumped through a pre-emptied pipe pre59037126 flow meter, record inter-sources of iffs maci, shaft of time between the occurrence of sig-1finye in view of the examination Nala with and with the last along. USSR author's certificate the flow of a pair of electrodes and $ 459673, cl, 6 Ot F l / OO, 1975. this is the iy filling interval of the known 5 2. N. N. N. V. Specifics of measuring the volume of the pipe between the first and last parameters of the last pair of electrodes determine ras-temperature power plants liquid motion. L1., Atomizddat, 1970, p. 354 (prototype). 1 Kociff / aaotpatpy U9.Z FIG.