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.
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