1923 KB41 KB199920252014Bajsič, IvanKutin, JožeRupnik, Klemenletnik:60številka:9str. 607-616, SI 108ISSN:0039-2480COBISSID:13659931URN:URN:NBN:SI:doc-ZBG9ZJLYenZveza strojnih inženirjev in tehnikov Slovenije et al.Strojniški vestnikeksperimentalna utemeljitev veljavnostikonstrukcijski parametrimerilne značilnicemetoda za identifikacijo vrste plinapotopni termični merilniki masnega tokatermična zaznavala pretokaA method for gas identification in thermal dispersion mass flow meters|A novel measurement method for the identification of the type of gas in a thermal dispersion mass flow meter is presented. The physical background of the gas-identification method is discussed by employing a simple one-dimensional mathematical model of a thermal flow sensor. For a practical realization of the gas-identification method, the thermal dispersion mass flow meter has to contain two thermal flow sensors with different constructional or operational parameters. A thermal dispersion mass flow meter containing two thermal flow sensors with circular and square cross-sections was developed and calibrated for five different gases in order to experimentally validate the gas-identification method. If the measurement characteristics for an improper gas are employed, the mass flow readings of the thermal flow sensors will generally differ. The absolute value of the relative difference in the mass flow readings can be used as the objective function for the identification of the type of gas from the defined set of gases with known compositions. Besides, the normalized error is proposed as the objective function to consider the dispersion that could be reasonably attributed to the difference in the mass flow readingsTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaUniverza v Ljubljani, Fakulteta za strojništvo