SU1154540A2 - Level gauge - Google Patents

Abstract

Level V on auth. St. No. 1059439, characterized in that, in order to increase accuracy with increasing measurement range, it is provided with an elastic dielectric tube disposed alongside. axially inside the diamagnetic guide tube and encompassing high yarns with a dielectric ferromagnetic fluid and a moving mercury contact.

Description

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(L The invention relates to instrumentation and can be used to measure the level in the oil, gas, gas processing, petrochemical and other branches of the national household. According to the main bus number 1059439 known gauge containing a float with a magnet mounted on a diamagnetic guide a tube filled with a dielectric ferromagnetic fluid with high-resistance wires in it and a moving contact made of mercury 1). However, the known device does not have sufficient accuracy with an increase in the measurement range (up to 10–15 m), because, because of the finite resistivity of the ferromagnetic fluid, the insulation resistance, shunting its high-resistance conductor decreases, and the associated measurement temperature increases. . This increases the error of this error on the quality of cleaning ferromagnetic fluid, from. changes in its electrical conductivity in the operating temperature range. The aim of the invention is to increase the accuracy with increasing the measurement range. The goal is achieved by the fact that a level gauge containing a float with a magnet mounted on a diamagnetic guide tube filled with a dielectric ferromagnetic fluid with high magnetic conductors and a movable contact made of mercury is provided with elastic dielectric tube located coaxially inside the diamagnetic guide tube and covering high-resistance conductors with a dielectric ferr with a magnetic fluid and a moving mercury contact. FIG. 1 shows the level gauge, general view; in fig. 2 is a section A-A in FIG. 1 (a framework with high resistance conductors, a mercury contact and a ferromagnetic liquid compacted under it); in fig. 3 section bb in fig. 1 magnetic system with pole pieces); in fig. 4 is a section on BB in FIG. 1 (part selected by lug tips). The level gauge contains a guide tube 1, an elastic dielectric tube 2, in which high resistance conductors 3 are located, on the frame 4 over the entire height of the guide tube. The high-resistance conductors 3 are immersed in a dielectric ferromagnetic fluid 5. On the outer side of the guide tube 1 there is a float 6 made of diamagnetic material with a permanent magnet 7 fixed inside it. The magnet is located between the rib 8 and the pole pieces 9, which surround the guide tube 1. Mercury contact 10 is held by a ferromagnetic liquid 5, compacted by a magnetic field. The pole tips 9 with the chosen part in the form of a truncated cone are oriented to the guide tube 1. High-impedance conductors 3 are turned on S in the measuring circuit, consisting of a power source 11, a measuring device 12 and a mercury contact 10. The float 6 synchronously with the level gauge operates as follows. Floats 6 synchronously with. the liquid level moves along the guide tube 1. Together with the float the magnetic system moves consisting of magnet 7, rome 8 and pole pieces 9. The magnetic field in the gap between pole pieces 9 condenses ferromagnetic fluid 5, with which it is supported and moved synchronously with the level of liquid mercury contact 10. The shape of the pole tips 9 creates an uneven magnetic field in the tube 2 with ferromagnetic fluid 5, which is maximally lateral, which allows the displacement of the float 6 pressing put the mercury contact Yu to the tube axis, as a result of which the reliability of the contact increases. At a height corresponding to the liquid level, the contact 10 closes the high-resistance conductors 3. When the length of the segments closed by the mercury contact 10 of the conductors 3 changes, their ohmic resistance changes. By changing the ohmic resistance (current in the circuit), the liquid level is determined by means of device 12. By placing high-resistance conductors with ferromagnetic fluid and a moving mercury contact in a dielectric tube, the accuracy of the level gauge increases, as the error is avoided due to the high-impedance conductor shunting. In addition, the use of a dielectric tube with an elastic property improves the manufacturability of the level gauge during manufacture and repair, especially with an increase in its linear dimensions, since the bending tube with the frame inside easily repeats when assembling the bending of the guide tube.

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Claims (1)

LEVEL> - by author St. N * 1059439, characterized in that, in order to increase accuracy with increasing measurement range, it is equipped with an elastic dielectric tube located to. axially inside a diamagnetic guide tube and enclosing high-resistance conductors with dielectric ferromagnetic fluid and a movable mercury contact. F "*. 7