一、概述孔口流量计又称流量校准器,根据测量流量的大小分大、中和小流量校准器。它广泛用于环保部门粉尘、TSP、PM10等中、小采样器的流量校准及环境监测中的大气采样器、总悬浮颗粒物采样器大流量的校准,而这些大气采样器等正是监测大气污染源的常用仪器,其监测的指标直接影响到国家日常公布的污染指数,故作为量传的上一级的流量校准仪器校准的准确性和检测方法至关重要,它直接影响到监测指数的准确性和可靠性。二、孔口流量计工作原理及计算公式孔口流量计的工作原理为差压式原理,计算公式 I. Overview Orifice flowmeter, also known as flow calibrator, according to the size of the measured flow points, and small flow calibrator. It is widely used in the environmental protection department dust, TSP, PM10, etc., small sampler flow calibration and environmental monitoring of the atmospheric sampler, total suspended particulate sampler large flow calibration, and these atmospheric sampler is just monitoring air pollution sources Of the commonly used instruments, the monitoring indicators directly affect the daily pollution index published by the country, so as the upper level of flow calibration equipment calibration accuracy and detection methods is crucial, it directly affects the accuracy of the monitoring index And reliability. Second, the orifice flowmeter working principle and calculation formula The orifice flowmeter principle of differential pressure principle, formula