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 devices
used for calibrating flow meters of liquid media in various industries, including model testing of
hydraulic 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 decreasing
the errors arising therefrom.
It was determined that the largest specific weight in the total error of determining the mass
and volumetric fluid flow rate is the error of the deflecting device, which depends on its dynamic
characteristics. The system for determining the profile of the liquid flow that fills the measuring
tank was improved. A device to control the position of the liquid flow and a method of determining
the time of filling the measuring tank, taking into account the use of modern laser sensors installed
on the measuring tank, is proposed.
It is shown that the use of laser position sensors with intersecting beams makes it possible to
reduce the measurement error of the measuring tank filling time caused by both low sensitivity of
flow position control devices and asymmetry of the flow entering the deflecting device.