内浮顶油罐静压式程控计量系统

The System of Program Controlled Measurement for Tanks with Internal Floating Roof

介绍了由直接引压装置、高精度电容型差压变送器、电流型集成温度传感器、关联电路、多通道高分辨率PC总线接口卡和主机IBM—PC386型微机组成,以UCDOS3.1为中文平台,用C语言编程的内浮顶油罐静压式程控计量系统。建立了一种能包括非计量区域在内的内浮顶油罐直接引压程控计量算法,从而实现了通过安装在储罐底部的直接引压装置,采用本质安全型电容式二线制差压变送器1151 DP5 E,测量储罐内油品静压力。根据内浮顶油罐直接引压式程控计量算法,用C语言编程,自动计算出罐内油品的商业质量。再根据键入的油品标准密度及平均温度测量值,计算出油品的计重密度、油面高度、体积等参数。与人工检尺、钢带液位计、雷达液位计等计量方法相比,具有精确度高、稳定性能好、功能齐全和使用维护方便等特点。

Introduced in this paper is the static pressure, program controlled measurement system for tanks with internal floating roof, which is made up of directly drawing pressure unit, capacitive based differential pressure transmitter with high precision, current based integrated temperature sensor, cognate circuits, multipath and high resolution PC bus interfcae card and a master computer of IBM-PC 386. Supported by a UCDOS 3. 1 Chinese platform, the system is developed by using C language. A calculating method on program control metering directly drawing pressure for tanks with internal floating roof including non-metering area is established, and the static pressure of the oil stored can be rnetered with the capacity based differential pressure transmitter(1151 DP 5E intrinsic safety model) by the unit installed at tank bottom. The commercial mass of oil stored can be computed automatically based on the calculating program mentioned above written by the C language, and the parameters of measured density, oil level and volume can also be determined by inputting its standard density and mean temperature measured. This method has such advantages as high accuracy, good stability, multi-functions and ease maintain over that of hand-dipping , servo level gauge and radar level gauge.