CECC capacitive differential pressure transmitter is a unit of DDZ－Ⅲ electric unit combine instrument. It includes capacitive differential pressure transmitter and the capacitive differential pressure transmitter with flange and widely used in chemical, petrochemical, oil refining, metallurgy, electric power, textile, food industry. It is used to measure flow, level, sub-interface, differential pressure, gauge pressure and convert the parameter into 4～20Ma DC signal output.