ISO 4064-1:2024

Overview

ISO 4064-1:2024 - Water meters for cold potable water and hot water: Part 1: Metrological and technical requirements specifies the metrological and technical requirements for water meters used in fully charged, closed conduits. It covers meters that indicate accumulated volume and includes mechanical, electrical/electronic, and hybrid designs, as well as electronic ancillary devices. This fifth edition aligns with OIML R 49-1 and updates the previous (2014) edition.

Key topics and requirements

ISO 4064-1:2024 addresses the following core technical and metrological topics:

• Scope and definitions - terms for water meters, constituents, metrological characteristics, operating and test conditions.
• Metrological requirements - defined flow points (Q1, Q2, Q3, Q4), accuracy classes (including class 1 and class 2), maximum permissible errors, reverse flow, absence of flow, and static pressure considerations.
• Electronic meter requirements - specific provisions for meters with electronic components, power supply options (external, replaceable and non-replaceable batteries), and ancillary electronic devices.
• Technical requirements - materials and construction, adjustment and correction devices, rated operating conditions, pressure loss limits, installation conditions, and marking/inscription requirements.
• Indicating and protection devices - types of indicators, verification devices and scale intervals, and electronic sealing/protection measures.
• Metrological controls and conformity - type evaluation and approval, initial verification, repeatability, durability and documentation requirements; type-specific testing protocols.
• Normative and informative annexes - Annex A (performance tests for electronic meters), Annex B (checking facilities), Annex C (permissible errors in service), Annex D (requirements for software-controlled meters).

Practical applications and users

ISO 4064-1:2024 is essential for:

• Water meter manufacturers designing and certifying mechanical, electronic or hybrid meters for potable cold and hot water.
• Test laboratories and national metrology institutes conducting type evaluation, performance testing and initial verification.
• Utilities, water suppliers and installers ensuring selection, installation and maintenance meet metrological and safety criteria.
• Regulators and conformity assessment bodies harmonizing legal metrology, approval and market surveillance processes.
• Software and electronic component developers integrating metrological-compliant calculators, indicators and ancillary devices.

This standard helps ensure accurate volumetric measurement, interoperability with national regulations, and reliable billing and water resource management.

Related standards

• ISO 4064 series (other parts)
• OIML R 49-1 (identical edition issued concurrently)

Keywords: ISO 4064-1:2024, water meters, cold potable water, hot water, metrological requirements, accuracy class, electronic water meters, ancillary devices, type approval.