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Due to the traditional boiler drum water level measurement using differential pressure type water level gauge, gauge mica method, the measurement process exists soda interface is not obvious, need temperature and pressure compensation. In order to solve the above problems, put forward a based on capacitance to digital conversion technology special Pcap01 intelligent multi segment type liquid level measuring system, and the application of HART communication unit access to sensor measuring process parameters, equipment configuration, calibration and other information. The overall scheme, sensor design, capacitance measurement circuit and HART communication circuit are described in detail, and the HART communication software and liquid level measurement and acquisition software are designed. Through the test of the design of the multiple – segment condenser boiler liquid level measuring system, the liquid level meter has high precision and convenient operation, which can solve the defects of traditional liquid level measurement, and can meet the actual requirements of the field.