流 量 积 算 仪 设 计摘 要近年来，伴随着工业生产、医疗卫生等领域的技术进步，人们对流量计量提出了更高的要求，而在全球自然资源供应日趋紧张的今日，提高流量测量精度更具有举足轻重的现实意义。因此，设计一个测量精度高、具有人机接口技术的流量积算仪具有很高的有用价值。论文以差压式流量计作为流量测量前端，采纳STC89S52单片机作为控制核心，ADC0832为模数转换电路，并设计了由数码管和矩阵式键盘组成的人机对话接口。在测量过程中，系统将流量计节流所获得的差压信号，经差压变送器后变成4～20mA的电流信号，通过I/V转换电路变为电压信号，然后进入ADC0832转变为单片机可接受的数字量，经单片机进行处理、积分运算后送数码管进行累积流量的显示。在对流量计算方法深化讨论的基础上，论文主要完成了流量积算仪总体方案的设计，同时完成了其硬件电路的设计和软件调试，成功完成了流量设定、累积和显示等方面的调试。关键词：流量测量；单片机；积算；ADC0832 The Design Of Flow TotalizerAbstractIn recent years, people have paid much more attention to the accuracy of flow measurement as technology progresses. Therefore, it is of great value in designing a flow totalizer which can measure flow accurately and have the man-machine interface technology. The intelligent flow totalizer system in this design is combined with the differential pressure flowmeter, pressure transducer and the micro controller unit techniques. The differential pressure flowmeter, it is used as the sensor of flow measurement. And aiming for a small and intelligent design, we use the MCU named STC89S52 as the main controller, the LEDs and the keyboard as the user interface. During the period of measurement, the transduction circuits transform the differential pressures received by the sensors into the voltage signals, and then, the voltage signals are transformed into digital signals by the A/D convertor. The MCU processes these digital signals and calculates the cumulation of the flow. Finally the...
