Agricultural irrigation equipment - Meters - Requirements (Part 1).

This document outlines the structure of the Iranian National Standard for agricultural irrigation equipment—specifically water meters (Part 1: Requirements). It begins with a foreword and covers the scope and application, mandatory references, and definitions. It then details metrological requirements including values like Q1–Q4 and MPE (Maximum Permissible Error), followed by specifications for meters and accessories such as materials, structure, installation, adjustment, and technical features. Performance tests are outlined, including those for static pressure, reverse flow, pressure loss, and magnetic field resistance. The document also addresses markings, sealing, security, and the impact of influencing quantities. Two appendices provide guidance on pulse input solutions and mandatory disturbance generators.