Avtomatizacija postopka umerjanja merilnikov pretoka plinov

Natančnost merjenja merilnih instrumentov je zelo pomembna pri spremljanju dobavljenih količin, kajti le z zagotavljanjem ustrezne natančnosti lahko zagotovimo željeno kakovost v procesnih sistemih ali pri distribuciji. V diplomskem delu predstavljam avtomatizacijo postopka umerjanja merilnih instrumentov za merjenje pretoka plinov, prvenstveno komprimiranega zraka. Na obstoječi sistem cevi (pogonskega sistema s puhalom in motorjem, ki ga poganja pogon s frekvenčno regulacijo) smo dodali prograbilni logični krmilnik za krmiljenje pogona in pretvorbo analognih signalov v digitalne in obratno. Nadzor nad stanjem delovanja in samodejno računalniško obdelavo parametrov smo izvedli s pomočjo po meri napisanega programa v sistemu SCADA. Rezultati kažejo, da avtomatizacija postopka zagotavlja sistematičnost, hitrejše in enostavnejše izvajanje, boljšo natančnost storitve. The accuracy of measuring instruments is of vital importance when monitoring the supplied quantities, as solely by assuring the required accuracy, required quality of service in the process systems and distribution can be achieved. The following thesis represents the automation of the process of calibration of gas flow meters, which in our case are mostly compressed air flow meters. By upgrading the existing pipe system and blower (driven by a motor with variable frequency drive) with a programmable logic controller that is also used as an analog to digital converter and vice versa, and by using the program in SCADA system to monitor operations and automation of data processing, we managed to obtain a higher accuracy of calibration. The results also show that the automation of this process makes the process more accurate, faster and simpler for the operator to perform.