差压式流量计干气体流量检测示值修正关系图

节流装置前后产生的差压决定于流过节流装置的气体工作状态参数。在推导示值修正公式时应注意三种工作状态流量：设计状态流量，即人为设定的工作状态流量；流过节流装置的工作状态流量，即管道中的实物流量；检测出的工作状态流量，即检测出未修正的差压代表流量，该流量是三者中最为关键的。应用图解法分析了差压式流量计干气体流量检测与示值修正公式。该公式也可用于喷嘴、文丘利管、阿牛巴、威力巴、弯头等差压式流量计示值的修正。

Relationship of the Indication Correction for Dry Gas Flow Measurement of Differential Pressure Flowmeter

The differential pressure between two ends of the throttle element depends on the parameters of operating status of the gas flowing through the throttle element. Three flow rates of operating status shall be noted when the correction formulas of indication are derived. These include flow rate of designed status, i. e. flow of artificial setup ; flow rate of actually flowing through the throttle device, i.e. flow of real material in pipeline; and flow rate measured, i.e. uncorrected flow from differential pressure. The last one is the most critical. The indication correction formulas of dry gas flow measurement for differential pressure flowmeter are analyzed by adopting graphic method. The formulas are also suitable to use for other differential pressure flowmeters, such as nozzle, Venturi, Annubar, Verabar and elbow flowmeters.