DIN EN ISO 5167-1:2023 通过插入完全运行的圆形横截面管道中的压差装置测量流体流量 第1部分：一般原则和要求 (ISO 5167-1:2022)
Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full - Part 1: General principles and requirements (ISO 5167-1:2022)