Using single chip microcomputer as main control device to control the quality of the gas flow and shows that the shell of the machine adopts the material of 316 l stainless steel temperature sensor consisting of thermal type gas mass flowmeter and automatic control of the transmitter, flow through acquisition, A/D conversion and control of the CPU, and through digital tube display and so on A series of hardware and software functions of the auxiliary implementation, complete control of the flow measurement.