With electrochemical portable oxygen detector, ultrasonic oxygen detector, ultrasonic oxygen sensor and other instruments and equipment, ultrasonic oxygen detector used to measure the gas flow and oxygen concentration in the binary gas, with temperature compensation, flow measurement, pressure measurement and other functions, widely used in oxygen detector and oxygen machine, oxygen chamber, ventilator and other oxygen equipment measurement. Electrochemical portable oxygen detector can be used for toxic gas leakage rescue, underground pipeline, mine, metallurgy, power plant, chemical industry, tunnel, tunnel and other places