差压式流量计在过程检测和计量中得到了广泛的应用。但若被测介质的最小流量小于标尺上限的30%,就会引入很大的相对误差。为了解决这个问题,上海溶剂厂试制成双量程差压式流量测量系统,並成功地投入了应用。这种测量系统分指示型和指示积算型。指示型系统主要用于过程检测,由节流 Differential pressure flowmeter in the process of detection and measurement has been widely used. However, if the minimum flow rate of the measured medium is less than 30% of the upper limit of the scale, a large relative error will be introduced. In order to solve this problem, Shanghai Solvent Factory made a double-range differential pressure flow measurement system and successfully applied it. This measurement system sub-indicator and indicating the type of integration. Indication system is mainly used for process testing, by the throttle