DSN series gas mass flow controller, said that the Mass Flow Controller (abbreviated as MFC), not only has the function of the mass flowmeter, more importantly, it can automatic control of gas flow, that is, the user may need to set the flow, MFC Will automatically flow at a constant value, even if there is pressure on the system or fluctuations in ambient temperature changes and will not deviate from its set value. In short, mass flow controller is a steady flow device, a manual can be set or a computer connection automation and the steady flow of gas installations.