ТРЕХТАКТНЫЙ ТРАНСФОРМАТОРНЫЙ КОНДУКТОМЕТР, ИНВАРИАНТНЫЙ К ВОЗМУЩАЮЩИМ ВОЗДЕЙСТВИЯМ

Abstract

Peculiarities of use of conductivity meters in the oil and gas industry. For the ecological monitoring of conductometry allows us to constantly monitor the maximum allowable concentrations of harmful substances in industrial waste waters, as well as to prevent instantaneous discharges into water bodies and rivers. The advantage of contactless conductivity meters with liquid communication circuit. The deficiencies of these devices associated with the influence on the measurement result of factors such as the instability of the source of harmonic oscillations, instability frequency, ambient temperature. Fundamentals of the theory of invariance of measurement and its main principle is the principle of multi-channel. The proposed scheme three-stage transformer conductivity meter, invariant to disturbing influences. The invariance principle is implemented in a three-stage transformer conductivity meter by introducing an exemplary conduction through the additional coil and the change gear ratio in one of the bars. Studies of such a device. The analysis shows that three-stage conductivity meter allows to eliminate the influence of the errors associated with the instability of the voltage and frequency of power supply, the inductance liquid loop, and also to eliminate stationary crosstalk that occurs in the core of transformer due to the flow of scattering of the exciting transformer. The dependence of the relative error of the instrument from the exemplary values of conductivity and resolution analog-to-digital Converter. Given the graph of this dependence. It is established that the main factor affecting the measurement error, is the resolution of the ADC. Construction of invariant measurement devices using the multichannel principle allows to obtain a high measurement accuracy, reduce the stability requirements of the units of these devices and to eliminate the influence on the accuracy indicators disturbing influences, including those in which single-channel measuring device virtually incapacitated.