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Cilj ovog rada je ispitivanje karatkeristika termostatske kupke s alkoholom (Isotech 465) u temperaturnom području -60 °C do 20 °C, koju Laboratorij za procesna mjerenja na Fakultetu strojarstva i brodogradnje (FSB-LPM) koristi u svrhu umjeravanja mjerila temperature. Ispitivanje je izvršeno korištenjem četiriju etalonskih platinskih otporničkih termometra prema internoj metodi laboratorija. Detaljno su opisani provedeni postupci i metode ispitivanja. Na osnovi rezultata ispitivanja izračunat je doprinos kupke u ukupnoj mjernoj nesigurnosti kada se ona upotrebljava za umjeravanje termometara. Rezultati ispitivanja dani su na kraju rada u tabličnom i grafičkom prikazu. Ispitivanje je obuhvatilo određivanje karakteristika kupki što uključuje radijalne i aksijalne temperaturne gradijente, vremensku stalnost temperature te dinamiku zagrijavanja, odnosno hlađenja. The aim of this work is an examination of characteristics of the thermostated bath filled with ethanol (Isotech 465), which is used for calibration of thermometers in Laboratory for Process Measurement at Faculty of Mechanical Engineering and Naval Architecture (FSB-LPM). The bath characteristics were examined using four calibrated standard platinum resistance thermometers, in accordance to internal laboratory procedure. The temperature range covered by this examination was from -60 °C to 20 °C. In this work, the procedures and methods used for bath examination are described in detail. Based on the examination results, the bath contribution to combined measurement uncertainties of subsequent thermometer calibrations are calculated , and the results are given in tabular and graphic form at the end of this paper. The examined characteristics of the bath includes radial and axial temperature gradients, temperature stability and dynamics of heating and cooling. |
