Mass flow measurement in gaseous media is made in most cases in form of a calculation of the "standard volume flow". There the state of the medium is set in relation to the regular standard conditions of the respective country. In Central Europe a temperature of 0°C and an absolute pressure of 101.325 kPa are the valid reference values for standardization of state variables of the gas.

This is the core function of µFLOW GS micro computer. Based on the measurement results of the absolute pressure p_A and the temperature T as well as the implemented statement for the standard density r_N of the respective gas the µFLOW calculates the standard volume flow and processes it as desired.

The hereby adjustable calculation procedures are the ideal gas law as well as the relevant international standardized procedure for the computing of natural gases. (AGA-NX19, GERG88)