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A mass flow meter directly measures the mass flow rate of the medium passing through it; it can also measure the density of the medium and indirectly determine its temperature. Since the transmitter is an intelligent instrument based on a microcontroller, more than a dozen parameters can be derived from these three basic quantities for use by users. The mass flow meter features flexible configuration, powerful functions, and a high performance-to-price ratio, making it a next-generation flow meter. A flow measuring instrument for measuring the mass flow rate in a pipeline. When the fluid under test experiences significant changes in parameters such as pressure and temperature, measuring only the volumetric flow rate can result in large measurement errors due to changes in the fluid density. In positive-displacement and differential-pressure flowmeters, the density of the fluid being measured can vary by 30%, which can result in a flow measurement error of 30–40%. With the increase in automation levels, many production processes have placed new demands on flow measurement. The chemical reaction process is controlled by the quality of the reactants (rather than their volume). The heating and cooling effects of steam and air currents are also proportional to the mass flow rate. Strict control over product quality, accurate cost accounting, and fuel quantity management for aircraft and missiles all require precision as well. Therefore, a mass flow meter is an important flow measurement instrument.