SU1247720A1 - Method of determining density of substances - Google Patents

Abstract

The invention relates to the field of measurement technology and can be applied in oil refining and petrochemistry, chemical, food and other industrial fields. The purpose of the invention is to expand the functionality and improve the reliability of measurements. The controlled substance is placed in one of the chambers, and the other chamber is filled with change of mass under the weight of a sample of volume bm, the vibrations of the elastic membrane separating both chambers are excited, and the pressure values in both chambers are measured. , weight .. 1 Il. i (lu 4d to

Description

The invention relates to a measuring technique and can be used in oil refining, petrochemistry, chemical, food and other industrial sectors.

The purpose of the invention is to enhance the functionality and increase the reliability of measurements by combining the operation of determining the mass and volume of the sample.

In the drawing, a diagram of the device: for the implementation of the method for measuring the specific weight of the substance A.

The device from chamber 1 of volume V, elastic membrane 2 with drive 3, pressure sensors 4 and 5, device 6 compared with setpoint Uy, device 7 compared with setpoint Uyj) chamber 8 of volume Vj, substance 9, dividing device 10, spring- 11, acoustic filters 12 and 13 pistons 14, generator 15 periodic-kHx oscillations.

The method is carried out as follows.

A substance 9 is placed in chamber 1, and the volume of chamber 8 changes by an amount determined by the expression;

5-St-e,

where S is the cross section of the chamber 8;

C is the flexibility factor of the prujens

t is the mass of the substance;

g is the acceleration of free fall and the change in the gas volume of chamber 1 to the value of V V, where V is the volume of the substance. The elastic membrane 2 sets in the chambers 1 and 8 equal and out-of-phase perturbations in volume, which cause gas pressure pulsations, which are identical to the pressure sensors 4 and 5 converted into signals U,

and and. These signals are fed to the inputs of the comparison devices 6 and 7, respectively, to the second inputs of which the signals Uy and Uyj, E are selected (chosen from zero output signals of the comparison devices 6 and 7 in the absence of a monitored substance. The output signals of the comparison devices proportional to the weight (mass) t and the volume V, of the controlled substance, are fed to a separating device 10, at the exit of which

The X signal is generated. Proportional to the specific wave (density)

controlled substance. Acoustic filters 12 and 13 serve to connect chambers 1 and 8 with a surrounding gas medium and ensure that the static gas pressures in these chambers are equal, and the generator 15 with a drive 3 to set the oscillations of the membrane 2.

Claims (1)

Invention Formula A method for measuring the specific gravity of substances, which involves simultaneously determining the weight of the substance and its volume, characterized in that, in order to expand the functionality and increase the reliability of measurements, the sample is placed in one of two chambers filled with gas and separated by an elastic membrane, using another the chamber, the volume of which varies with the weight of the sample, excites periodic oscillations of the membrane, records the change in pressure in the chamber with the sample, corresponding to the volume of the sample, and pressure in a chamber without a sample, corresponding to its weight, and the specific weight is determined by the ratio of the registered pressure difference.