SU1265569A1 - Method for measuring moisture content of liquid media - Google Patents

Abstract

This invention relates to a technique I for measuring the quality indicators of liquid media and can be used at metering stations of main oil pipelines. The purpose of the invention is to improve the accuracy of measuring the humidity of liquid media. The method of measurement consists in simultaneously measuring the dielectric constant, density and compressibility of the medium under investigation. The signals from the dielectric permittivity and compressibility meters are fed to the output of the functional amplifier, where they are compared with the signals taken during the i calibration of the device and found (L 1s in the memory of the functional amplification .. Based on the results of the comparison, the corrected signal is entered. Corrected signal enters the registrar. 1. tc Od cl SP Od with

Description

The invention relates to a technique for measuring the quality indicators of liquid media, such as oil, and can be used at metering stations of main oil pipelines.

The aim of the invention is to improve the accuracy of measuring the humidity of liquid media.

The drawing shows a block diagram of the device for implementing the method. ; The block diagram includes a pipeline 1 with the test liquid 2, mounted; tubing in the pipeline sensors of electrical permittivity 3, density A, compressibility 5, dielectric permittivity meter 6, density meter 7, compressibility meter 8, functional amplifier 9 and recorder 10.: Signals from dielectric permittivity meters 6, density 7,: compressibility 8 are received To the input of the functional amplifier 9. In the functional amplifier 9, the signals from dielectric permittivity meters 6, the compressibility density 7f 8 are compared with the signals captured during calibration. devices and devices in the memory of functional satellite. According to the results of the comparison, the necessary corrective actions are entered into the fundamental amplifier 9. Corrected output signal pos; blunt to the recorder 10.

Example, DP tests collect a laboratory layout of a device for measuring the moisture of liquid media. AT . As a test medium, transformer oil with a density of 0.895 g / cm is used, which is diluted with kerosene with a density of 05.825 g / cm. Samples with a given humidity and are distributed in accordance with the methodological guidelines for preparing artificial samples (emulsions) to check and calibrate moisture meters. for oil.

The dielectric constant is measured using a dielectric sensor and an AC bridge. Density is measured using a density meter. Compressibility measurement dp is a device of type USG-100. The compressibility of oil is determined as the ratio of the change in the volume of oil to the change in pressure in a synthetic vessel obtained by displacing the piston in the oil.

The proposed method is carried out in the following sequence: the vessel is filled with the liquid under test, the moisture – dielectric dependence of the fluid is removed, the humidity, density and compressibility of the fluid are measured simultaneously, and the desired humidity is determined (i.e. a correction is entered into

the result of measuring the dielectric constant functionally related to humidity) by the density and compressibility of the medium under study by the formula

W a + b 4-cf -f d,

where a, b, O J ci are the coefficients obtained when calibrating the device with minimum values of humidity, density and compressibility of the test liquid;

, W, S, p, f - moisture, dielectric constant, density and compressibility of the test liquid. Improving the accuracy of moisture measurement using the proposed method contributes to increasing the reliability of measuring the amount of oil in the - report on the nodes of main pipelines

The proposed method of measuring humidity can also be used in various areas of the national economy, where there are changes in the chemical composition of the studied liquid media.

Claims (1)

Invention Formula The method of measuring the moisture of liquid media, consisting in the simultaneous measurement of dielectric constant and density, characterized by the fact that with the chain of increasing the accuracy of measurement, the compressibility of the test medium is simultaneously measured and the desired parameter is determined taking into account the measured value. Xx .