多段电容式锅炉液位测量系统设计

Multiple-Segment Capacitance Liquid Level Meter

摘要:

由于传统的锅炉汽包水位测量多采用差压式水位计、云母水位计等方法,测量过程中存在汽水分界面不明显,需要温度、压力补偿及投入麻烦等缺陷,为解决上述问题,提出了一种基于电容数字转换技术专用芯片Pcap01的智能多段式液位测量系统,并且应用HART通讯单元访问传感器的测量过程参数、设备组态、校准等信息；对多段电容式液位测量系统的总体方案、传感器设计、电容测量电路、HART通讯电路的设计进行了详细论述,同时设计了HART通讯软件和液位测量采集软件；对所设计的多段电容式锅炉液位测量系统经过试验表明,该液位计精度高、操作简单方便,解决了传统液位测量的缺陷,可以满足实际现场要求。

Abstract:

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.