Improvement of metrological characteristics of calibrating units of flow measuring devices

Abstract

The paper presents an analysis of the operation of mass and volumetric calibration devicesused for calibrating flow meters of liquid media in various industries, including model testing ofhydraulic machines in specialized hydraulic turbine laboratories. The aim of the work is shown,which is to analyze the characteristics of deflecting devices and to determine the ways of decreasingthe errors arising therefrom.It was determined that the largest specific weight in the total error of determining the massand volumetric fluid flow rate is the error of the deflecting device, which depends on its dynamiccharacteristics. The system for determining the profile of the liquid flow that fills the measuringtank was improved. A device to control the position of the liquid flow and a method of determiningthe time of filling the measuring tank, taking into account the use of modern laser sensors installedon the measuring tank, is proposed.It is shown that the use of laser position sensors with intersecting beams makes it possible toreduce the measurement error of the measuring tank filling time caused by both low sensitivity offlow position control devices and asymmetry of the flow entering the deflecting device.