DIN EN ISO 5167-1:2004 用园截面管道中插入的压差装置测量流体流量.第1部分:总体规则和要求
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 5167-1:2003); German version EN ISO 5167-1:2003