Water meters for cold potable water and hot water - Part 4: Non-metrological requirements not covered in ISO 4064-1 (ISO 4064-4:2024)

This document establishes supplementary non-metrological requirements for metering devices used to measure cold water, hot water, and potable water, extending beyond the metrological specifications defined in the foundational international guidelines. It addresses specific technical and operational criteria necessary for the reliable performance of such instruments when they fall outside the primary metrological scope. The text outlines essential provisions regarding installation, environmental adaptability, and long-term durability to ensure consistent water usage monitoring. These guidelines focus on the practical aspects of deployment, including mechanical robustness under varying thermal and pressure conditions. The content serves to harmonize national practices with international norms by defining clear parameters for meter reliability and maintenance. It covers design features, material compatibility, and safety considerations to support accurate measurement in diverse utility scenarios. The framework ensures that devices meet rigorous standards for field application, facilitating fair billing and efficient resource management. By aligning with established international principles, this publication provides a comprehensive reference for manufacturers, regulators, and utility operators dealing with water metering infrastructure and compliance verification.