SU1603237A1 - Device for determining density of liquid media - Google Patents

Abstract

The invention relates to the field of instrumentation technology, in particular, to devices for determining the density of liquid media. The purpose of the invention is to improve the determination accuracy and enhance the functionality by measuring the level. The device contains two hermetic chambers, the upper walls of which are made in the form of elastic membranes with rigid centers and rods. A float is attached to the hard center of one of the membranes. Rods abut pressure sensors. The controlled medium is located in the tank and exerts pressure on the membranes of the chambers in proportion to the density and level of the liquid, and the effect on the float is proportional to the density of the liquid. To compensate for the overpressure, the vapor phase is fed under the membranes of the chambers. 1 il.

Description

H is the distance from the free surface of the liquid to membranes 4 and 5;

D is the diameter of the membranes;

d is the diameter of rigid centers;

V is the volume of the float;

M is the weight of the float;

m is the total weight of the membranes 4 or 5, the hard center 6 and the stem 7;

The pressure impulse is removed from the vapor phase | containers 15 through tap 14 and through impulse lines 18 through openings 16 are fed into the cavity of chambers 2 and 3. Thus, a compensating force acts on the membranes 4 and 5 from below.

 - (D + Dd + d).

As a result, the rod 7 of the chamber 3 acts on the pressure sensor with the resultant force

Fi Fi-F / DgH- (tf + Dd + d + m, (1)

and the camera stem 4 is with the resultant force Pr F2 FI rdN (D2 + Dd + d) + m. (2)

By jointly solving equations (1) and (2), one can determine the distance from the free surface of the liquid to membranes 4 and 5 (F2 – L t) V

H

g (D + Dd + d2) (M-FUF) and fluid density

) V

(3)

(four)

Since h is the set depth (fixed constant of the instrument) and is constant for each case, the level of liquid in the tank

15 equals

(five)

The signals from the pressure sensors 8 are transmitted by wires 9 to a counting device (not shown, for example, to an Electronics MK64 machine), where according to equations (3). (4) and (5) the density p and the level of the fluid in the tank 15 are calculated. The cross-shaped support 12 serves as a support for the float 10 with a dry container 15, s protective cap 13

protects the float from possible sudden impacts of the environment.

Formula of Invention

A device for determining the density of liquid media, containing a sealed chamber, the upper wall of which is made in the form of an elastic membrane with a rigid center, a sensor detecting the force acting on the membrane and a registering device, which, in order to improve the accuracy of determining and expanding the functionality by measuring the level, it additionally contains a float, a second sealed chamber identical to the first and a second sensor detecting the force acting on the membrane, while the float is connected to ECTS center of the membrane.

/ g 16

789 978

16 3

Claims (1)

Claim A device for determining the density of liquid media, containing a sealed chamber, the upper wall of which is made in the form of an elastic membrane with a rigid center, a registration sensor for the force acting on the membrane and a recording device, characterized in that, in order to increase the accuracy of determination and enhance the functionality beyond the level measurement account, it additionally contains a float, a second sealed chamber identical to the first, and a second sensor for recording the force acting on the membrane, while the float is connected to the same IMT center of the membrane.