CHANGAI Electronic Science & Technology Co., Ltd is a high-tech corporation that is specialized in studying, developing, producing and selling high quality gas sensors, analyzers & systems in China. Headquartered in Shanghai, CHANGHAI has another fully-funded subsidiary in Chengdu, Sichuan Province. So far, CHANGHAI has extended its business scope from simple gas analyzers to gas analyzing systems so as to provide particular product, technical consultations and solutions for global users in gas and gas equipment field. In China, CHANGAI has three marketing branches and over 30 service outlets covering more than 30 provinces and municipalities. Globally, its marketing service reaches Southeast Asia, Middle East, Europe, South America and south Africa and its products have been exported to more than 20 countries and widely applied to air separation plant, petroleum, chemical engineering, coal mine, metallurgy, electronic power industry, medical treatment, food, aviation, etc. Our main products include: online or portable oxygen analyzers, oxygen transmitters, dew point analyzers, hydrogen analyzers, thermal conductivity analyzers, high temperature humidity analyzers and all kinds continuous analyzing systems.