SU501279A1 - Electromagnetic Flow Sensor - Google Patents

Description

one

This invention relates to the field of measuring the consumption of electrical conductive fluids,

Electromagnetic flow meter sensors, a rectangular channel foldout, a device for creating a two component magnetic field, and two electrodes in the form of side conductive walls of the channel are known. The disadvantage of lime sensors is the need for phase-sensitive signal separation.

In the described sensor, in order to increase accuracy and simplify the construction of one of the side walls of the channel along its entire height, an additional electrode is separated vertically, separated from the main electrode of this wall with a non-conducting hydrophobic material.

The described sensor is represented in the drawing. It contains a rectangular tray 1, vb (filled with the first non-conductive material, electrodes 2, 3 and 4 in the form of plates of corrosion-resistant electrically conductive material and a strip of hydrophobic material 5. The magnetic system located outside the tray creates a magnetic field in the sensor volume, and induction of the magnetic field B in the plane of the cross section of the tray at a certain angle so that it is decomposed into two components. The component BI is directed perpendicular to the bottom

cayala, and component of induction B across the channel, perpendicular to the side walls. The main electrodes 2 and 4 provide a speed measurement, and the electrodes 2 and 3 measure the level of a liquid. The band of hydrophobic material 5 between electrodes 2 and 3 is necessary in order to tear off the liquid film wetting the channel wall and avoid the conductive zone between electrodes 2 and 3 above the liquid level in the channel. Electrode 2 is common in both electrode systems and is grounded. When fluid 6 flows through the tray, it crosses the magnetic field lines of the induction Si and between electrodes 2 and 4 appears e. d. s., is proportional to speed. The intersection of the fluid component Vz does not create e. d. on these electrodes.

The electrodes 2, 3 and the liquid between them form a VitOK to the level of the surface, in which, due to the presence of the component field So, a transformer is induced. D. s., is proportional to the level of the liquid. When the electrode 2 is grounded, a signal proportional only in magnitude to speed is removed from electrode 4, and only level to electrode 3.

The magnetic system is performed, for example, in the form of a pair of identical coils located one above, the other under the channel with the axis of symmetry coinciding with the longitudinal