Meritve v realnem času za učinkovito upravljanje sistemov oskrbe s pitno vodo

Đuvelek, Edo (author), Steinman, Franc (mentor), Kozelj, Daniel (comentor)

V magistrski nalogi smo želeli preveriti vpliv merilnega jaška s pripadajočimi armaturami na merilno negotovost treh preizkušenih merilnikov pretoka. Predstavljeno je teoretično ozadje meritev pretoka, njihov namen, uporaba, različne tehnologije merjenja, telemetrija, ter merilna negotovost in njeno določanje. Naloga temelji na izvedbi in analizi meritev pretoka, ki sem jih opravil v laboratoriju Katedre za mehaniko tekočin na Fakulteti za gradbeništvi in geodezijo, Univerze v Ljubljani. Preizkušeni merilniki pretoka so bili turbinski merilnik pretoka (Flostar M), ultrazvočni merilnik (FlowIQ 3100) in elektro magnetna merilna palica Signet 2552 Magmeter . Kot referenčni merilnik sem uporabil Thomsonov preliv s standardizirano prelivno ploščo z V zarezo (kot 53°8'). V prvem naboru meritev sem želel določiti vpliv merilnega jaška s pripadajočimi armaturami (dva FF spojnika, lovilec nesnag, montažno demontažni kos in zaporna armatura) na merilno negotovost preizkušenih merilnikov. Poleg tega sem izvedel še dodatni nabor, v katerem sem zadostil vsem namestitvenim pogojem proizvajalca ter preveril kako to vpliva na pripadajočo merilno negotovost. Pri analizi rezultatov smo se ravnali skladno z zahtevami mednarodnega standarda ISO 5168 »Meritve pretoka tekočin – Postopki ocenjevanja negotovosti« iz leta 2005 in za vsak merilnik v odvisnosti od pretoka določili merilno negotovost tipa A. Rezultate izmerjenih pretokov in pripadajoče razširjene merilne negotovosti sem prikazal v obliki grafikonov.

• Language: Slovenian
• Keywords: Meritve pretoka, merilnik pretoka, merilni jašek, merilna negotovost, standard ISO 5168:2005
• Work type: Master's thesis/paper
• Organization: FGG - Faculty of Civil and Geodetic Engineering
• Year: 2017
• PID: 20.500.12556/RUL-99014
• Publication date in RUL: 21.12.2017

Secondary language

• Language: English
• Title: Measurements in real time to effectively manage water supply systems

Abstract

In the presented work, we wanted to check the effect of the measuring shaft with the associated fixtures on the measurement uncertainty of the three tested flow meters. The reader is presented with theoretical background of flow measurements, their purpose, application, various measurement technologies, telemetry, and measurement uncertainty and its determination. The master’s thesis was based on the implementation and analysis of the flow measurements I performed in the laboratory of the Department of Mechanics of Liquids at the Faculty of Civil Engineering and Geodesy, University of Ljubljana. The tested flow meters were turbine gauge (Flostar M), ultrasonic meter (FlowIQ 3100) and electromagnetic measuring rod (Signet 2552 Magmeter). As a reference gauge, I used Thomson weir with a standardized top plate which has a V-notch (angle 53 ° 8 '). In the first set of measurements, I wanted to determine the influence of the measuring shaft with the associated fixtures (two FF connectors, a dirt catcher, a disassembling piece and locking fixtures) on the measurement uncertainty of the tested meters. In addition, I carried out an additional set in which I met all the installation conditions of the manufacturer and checked how that influences the associated measurement uncertainty. In analyzing the results, we complied with the requirements of International Standard ISO 5168: "Measurement of Liquid Flow - Uncertainty Assessment Procedures" of 2005. For each meter we determined the measurement uncertainty of type A as a function of flow. I showed the results of the measured flows and the associated extended measurement uncertainty in the form of graphs, standard ISO 5168.

• Keywords: Flow measurement, flow meter, measuring shaft, measurement uncertainty, ISO 5168:2005