Abstract
The article presents the basic characteristics of measuring installations for liquids other than water, on the example of installations for liquefied propane-butane gas. The purpose of checking the measuring system is to determine its relative error based on a comparison of the amount of liquid that flowed through the meter of the system to the amount of liquid determined using the standard, which is a second-order metal flask. Significant impact of environmental conditions during measurements was also indicated and the impact of uncertainty components on expanded uncertainty was discussed.
