RU2004107730A - METHOD FOR DETERMINING (MEASURING) THE DENSITY OF A LIQUID ENVIRONMENT AND A DEVICE FOR ITS IMPLEMENTATION - Google Patents

Claims (2)

1. A method for determining (measuring) the density of a liquid medium, in which a complete immersion float with a predetermined (structurally) density ρ _n with a permanent magnet embedded in it is placed (create an electromagnet) in the area of the permanent magnet of the float, a magnetic field with a vertical orientation magnetic field lines, with the help of which the force interaction of this field with the field of the permanent magnet of the float is controlled, that is, the buoyancy of the latter is measured in the measured liquid medium and the time t of its nominal Δh displacement, which is a measure of density, characterized in that the magnetic field in the electromagnet is created by stabilized direct current, the value of which is taken to be obviously larger than the value necessary for the float to float-dive in the working range of measuring the density of a liquid medium when changing the polarity of the current in an electromagnet, moreover, simultaneously with a change in the polarity of the electromagnet current, the duration of each of the two time intervals required for the complete cycle of the movement of the float down t ₁ and up t _{2 is} measured, or vice versa, within this predetermined regular (i.e. structurally limited) displacement Δh, and the density ρ _{w of the} liquid medium is determined by the formula:

where (t ₂ -t ₁ ) is the difference in the stroke time of the float up and down; (t ₁ + t ₂ ) - the sum of the time the float moves up and down; K is the density scaling factor. 2. A device for implementing the method for determining (measuring) the density of a liquid medium according to claim 1, comprising a housing with a measuring cavity, a float (in the cavity) with a permanent magnet, an electric sensor for the upper position of the float connected to a timer and a density calculation unit, an electromagnet, an electromagnet power source, characterized in that it comprises an electric sensor for lowering the position of the float, also connected to a timer and a density calculation unit, the float and a permanent magnet are interconnected by a lever agom with the possibility of swinging in the vertical plane, the horizontal axis of swing of the lever is located in the center of the permanent magnet, the electromagnet is made with an open magnetic circuit and winding, part of the body with a permanent magnet of the float is placed in the gap of the magnetic circuit of the electromagnet, while the permanent magnet of the float is symmetrical with respect to the axis of swing, and relative to the lever, the electromagnet power supply is made in the form of a stabilized DC source, and the density calculation unit is made in the form MODULES with the functions of switching the polarity of the electromagnet power supply measuring time intervals float movement up and down t ₁ t ₂ (or vice versa), quality control and power stabilization calculating fluid density.