Projekt sustava za umjeravanje pretvornika apsolutnog tlaka do 2 bar

master's thesis

• Title (english): Project of a system for calibration of absolute pressure gauges up to 2 bar
• Author: Tin Peternel
• Mentor: Lovorka Grgec-Bermanec (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2025-02-10, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering; Process Energy Engineering

Abstract

Tema ovoga rada uspostava je lanca sljedivosti mjerila apsolutnoga tlaka do 2 bar. U uvodnom dijelu rada opisani su principi i metode po kojima se mjeri apsolutni tlak. Također, pojašnjene su bitne fizikalne veličine koje se koriste pri mjerenju apsolutnoga tlaka. Naglašena je potreba i način na koji se uspostavlja lanac sljedivosti uređaja koji mjere tlak. Za uspostavu lanca sljedivosti najbitnije je poznavati etalonsku opremu i njenu mjeru nesigurnosti zbog toga je u eksperimentalnom dijelu rada glavni zadatak izračunati mjernu nesigurnost etalonskih uređaja koji se koriste pri umjeravanju barometara. Umjeravanja su provedena po smjernicama EURAMET koja su opisana u dokumentima EURAMET CG-3 i EURAMET CG-17, a mjerna nesigurnost izračunata po postupku opisanom u dokumentu DKD-R6-1. Za umjeravanje etalonskog barometra Ruska korištena je plinska tlačna vaga DHI čiji je lanac sljedivosti poznat i iz kojega se lako došlo do njene mjerne nesigurnosti. Detaljno je opisan postupak umjeravanja etalonskog barometra Ruska na plinskoj tlačnoj vagi te je izračunata njegova mjerna nesigurnost u devet točaka u području od 100 do 2600 mbar apsolutnog tlaka. Nadalje, pristupilo se umjeravanju električnih digitalnih barometara BOSCH i TESTO u vakuumsko-tlačnoj komori etalonskim barometrom Ruska nakon čega je dobivena njihova mjerna nesigurnost za područje od 650 do 1100 mbar. Time je završen eksperimentalni dio rada i pristupilo se analizi koja je pokazala da svaka sljedeća karika u lancu sljedivosti ima tendenciju za većom mjernom nesigurnosti od prethodne.

Abstract (english)

The topic of this paper is the establishment of the traceability chain for absolute pressure measurement standards up to 2 bar. The introduction outlines the principles and methods used for measuring absolute pressure. Additionally, it explains the key physical quantities involved in absolute pressure measurement. The need for and the approach to establishing a traceability chain for pressure measurement devices are emphasized. For the establishment of the traceability chain, it is crucial to understand the measurement uncertainty of each device within the chain. Therefore, the main task of the experimental part of the work is to calculate the measurement uncertainty of the devices used in calibration. The calibrations were carried out according to EURAMET guidelines described in the EURAMET CG-3 and EURAMET CG-17 documents, and the measurement uncertainty was calculated following the procedure outlined in the DKD-R6-1 document. For the calibration of the Ruska reference barometer, a gas pressure gauage DHI was used, with a well-established traceability chain, making it straightforward to determine its measurement uncertainty. The procedure for calibrating the Ruska reference barometer on the gas pressure gauage is described in detail, and its measurement uncertainty was calculated at nine points in the range from 100 to 2600 mbar. Furthermore, the calibration of the Bosch and Testo digital barometers was carried out in a barochamber using the Ruska reference barometer, resulting in the determination of their measurement uncertainty in the range from 650 to 1100 mbar. This concluded the experimental section of the paper, followed by an analysis showing that each subsequent link in the traceability chain tends to have a higher measurement uncertainty than the previous one.

• Keywords: apsolutni tlak; barometar; lanac sljedivosti; mjerna nesigurnost; plinska tlačna vaga; vakuumsko-tlačna komora
• Keywords (english): absolute pressure; barometer; chain of traceability; measurement uncertainty; gas pressure gauage; barochamber
• Language: croatian
• URN:NBN: urn:nbn:hr:235:956747
• Study programme: Title: Mechanical Engineering; specializations in: Design, Process and Energy Engineering, Production Engineering, Engineering Modelling and Computer Simulation, Marine Engineering, Industrial Engineering and Management, Materials Engineering, Mechanics and Robotics, Autonomous Systems, Mechatronics and Robotics; Course: Process and Energy Engineering; Study programme type: university; Study level: graduate; Academic / professional title: sveučilišni/a magistar/magistra inženjer/inženjerka strojarstva (sveučilišni/a magistar/magistra inženjer/inženjerka strojarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2025-01-30 13:09:52