Calibrating and Graduating of Multi-Sensor Gas Analyzer

Abstract

Introduction. The article is devoted to the calibration and graduation of the multi-sensor gas analyzer developed at the V.M. Glushkov Institute of Cybernetics of National Academy of Sciences of Ukraine. The modern trend in the development of medical equipment, in particular, containing built-in measuring devices, consists in its miniaturization, intellectualization, the use of information technologies, and the introduction of wireless and network means of data transmission. The purpose of the article is to design, create electronics and software for recording the concentration of three gases (oxygen, carbon dioxide and carbon monoxide), test and calibrate the device. Results. Three prototypes of sensor modules for oxygen, carbon dioxide and carbon monoxide have been created. The structure, scheme of connection of sensor modules, and the principle of operation of the gas analyzer was described. Testing and optimization of these prototypes were performed. Auxiliary pneumatic equipment for checking the performance of devices, their calibration and graduation was manufactured. Measurement technique was developed and test measurements of the specified gases were performed. The calibration technique was developed and the device was calibrated using two test gas samples such as ethanol vapor and air-gas mixture of carbon dioxide. In addition, a special software has been developed, which allow observe a registered input signal from sensor modules and store it to the file. Conclusions. As a result of the work, prototype of the device was created, its testing, calibration and graduation were carried out at the State Enterprise "Ukrmetrteststandart", 4 certificates of metrological attestation were obtained. The gas analyzer can be used for screening of healthy persons based on study of exhalation to predict the risk of diseases. Keywords: multi-sensor gas analyzer, oxygen, carbon dioxide, carbon monoxide, calibration, graduation.

Construction and method of assessment and research of the parameters of a load-lifting winch with a sectional disc drum

“…In the design calculation from ( 7) is determined i -the number of working winding layers, after which the total number of layers is set i spare , taking into account spare layers i spare = 1…2 and fasteners i fs = 1…1.5, in the construc tion of a sectional drum with a multilayer winding. After installation i ∑ = i+i fs +i spare , from (7) the final length of flexible elements is determined L, m.…”

“…The profile of the groove in the section perpendicular to its axis of symmetry corresponds to the shape and dimen sions of the profiles of standard elements (parts) for fastening steel cables and ropes. Disks are made of highstrength and heatresistant synthetic dielectric material [7], for example, fiberglass, which will ensure the necessary level of interac tion of the insulation of the winch design elements and the power supply. The central holes in the discs, when they are connected in a sectionaldisc drum, form a cylindrical cavity in the central part of the drum, through which the ends of the power cables are brought out to the movable contacts of the ring current collector, fixed on the outer disc of the drum (on the left).…”