Measurement of fluid flow in closed conduits -- Velocity-area methods of flow measurement in swirling or asymmetric flow conditions in circular ducts by means of current-meters or Pitot static tubes— 34 стр.
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— 41 стр.
Direct acting indicating analogue electrical measuring instruments and their accessories; part 8: special requirements for accessories (IEC 60051-8:1984, edition 4); german version EN 60051-8:1989— 6 стр.