Preface General CEC Series Capacitance Type Differential Pressure and Gage Pressure Transmitters are designed by Shanghai Guanghua Instrument Factory (State-owned No. 264 Factory) Referring to the advanced international technique, and were first produced in 1981. After production, sales, and further improvement and development, for more than ten years GUANGHUA CEC Series Pressure Transmitters become more and more perfect in performances, reliability, and have occupied the first place among the domestic capacitance type transmitters. Cec (H) Series Nuclear Safety Class Pressure Transmitters Served as the only domestic capacitance type DP / GP transmitters which may be used in nuclear power plants, had been applied in Qinshan nuclear power station in 1989 and in CHASHMA nuclear power plant of Pakistan in 1996. Cec_s Series smart pressure transmitters are assembled using imported smart circuit board and CEC series capacitance type transmitters. The zero and span may be adjusted in the field, or by Model 268 or 275 Smart Handheld Communicator (Imported, HART communication protocol) . The square root output or linear output can be selected by the smart transmitter has self-diagnosis function. Cec Series Pressure Transmitters are famous for their excellent design, complete variety, convenient installation, explosion-proof structure and so on, especially for their high accuracy, small volume, good outline, reliable stability and low price have won a high reputation in the market, and are widely used in the petroleum, chemical, metallurgy, power, food, paper-making, pharmaceutical, textile industries to measure and detect the differential pressure, gage pressure, absolute pressure, flow, liquid level, density etc. of the fluid. Now more than ten thousands CEC Series Pressure Transmitters are produced and sold per year.