Simple Mass Flow Detection System:

As the previous equations demonstrate, temperature and pressure values could be used to electronically compensate flow for changes in density. A easy mass flow detection system is described through Figure where measurements of temperature and pressure are made along with generally used instruments.

Figure: Simple Mass Flow Detection System

For the precise measurement of gas flow (steam) at varying pressures and temperatures, it is must to determine the density, that is pressure and temperature dependent, and from this value to calculate the fact flow. The use of a computer is necessary to measure flow along with changing pressure or temperature. Given Figure describes an instance of a computer specifically designed for the measurement of gas flow. The computer is designed to accept input signals from generally used differential pressure detectors, or from density or pressure plus temperature sensors, and to gives an output that is proportional to the original rate of flow.  A computer has accuracy better than +0.1% at flow rates of 10% to 100%.