ISO 4064-1-2024 PDF

Full title and description

ISO 4064-1:2024 — Water meters for cold potable water and hot water — Part 1: Metrological and technical requirements. This part specifies the metrological and technical requirements for water meters that measure the volume of cold potable water and hot water flowing through a fully charged, closed conduit; it covers mechanical, electrical/electronic and hybrid meters and includes requirements for ancillary electronic devices and indicating/calculator units.

Abstract

This document defines the metrological characteristics (flow-rate values Q1, Q2, Q3, Q4 and designation), accuracy classes and maximum permissible errors, temperature and pressure classes, marking and labelling, requirements for indicating devices and calculators, requirements for ancillary/electronic devices and related metrological provisions for water meters used on cold potable and hot water systems. It is aligned with the corresponding OIML provisions and is intended for use in type-evaluation, verification and manufacturing of water meters.

General information

• Status: Published.
• Publication date: 19 December 2024 (ISO publication: December 2024; catalog listings show 19 Dec 2024).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 91.140.60 (Water supply systems / water meters).
• Edition / version: Edition 5 (2024).
• Number of pages: 46 pages (ISO bibliographic entry).

Scope

Specifies metrological and technical requirements for water meters for cold potable water and hot water in fully charged closed conduits, including meters based on mechanical, electrical or electronic principles and mechanical meters incorporating electronic elements. The part also covers electronic ancillary devices (optional except where national/regional regulations require them) and applies to indicating devices, calculators and separable measurement transducers used with the meters. The standard is intended for type evaluation, verification and conformity assessment in conjunction with the companion parts of the ISO 4064 series.

Key topics and requirements

• Definition and designation of flow-rate parameters Q1, Q2, Q3 and Q4 and rules for expressing meter nominal flow and Q3/Q1 ratio.
• Accuracy classes (class 1 and class 2) and maximum permissible errors (MPE) for upper and lower flow zones (examples: class 2 MPEs typically ±2% in the upper zone at ≤30 °C, ±3% above 30 °C, and ±5% in the lower zone).
• Temperature classes for meters (T30, T50, T70, etc.) and associated test/operating temperature ranges.
• Requirements for indicating devices, verification scale intervals, resolution and marking (unit of measure, accuracy class, Q and Q3/Q1 ratio, flow direction markings, verification mark provisions).
• Requirements for calculators, separable measurement transducers, connections between electronic parts, adjustment/correction devices and security (prevention of tampering/reset).
• Environmental, mechanical and electromagnetic immunity/robustness requirements relevant to normal installation and operation.
• Reference to specific test methods and type evaluation procedures given in ISO 4064-2 and test-report format in ISO 4064-3 (to be used together for conformity assessment).

Typical use and users

Designers and manufacturers of residential, commercial and industrial water meters; testing and calibration laboratories; legal metrology authorities; utilities and water distribution operators; procurement and compliance teams specifying metrological performance and conformity requirements for water meters and ancillary measurement devices. The standard supports type evaluation, initial verification and production conformity activities.

Related standards

Main related documents include ISO 4064-2:2024 (Part 2 — Test methods) and ISO 4064-3:2024 (Part 3 — Test report format). The ISO 4064 series is developed in cooperation with OIML (OIML R 49 family) and is adopted/implemented as EN ISO/ national adoptions in many regions. Users should also consult the corresponding OIML and regional (EN) versions where applicable for legal/metrological harmonization.

Keywords

water meter, potable water, hot water, metrological requirements, accuracy class, Q1 Q2 Q3 Q4, maximum permissible error, test methods, indicating device, calculator, ancillary device, OIML R 49.

FAQ

Q: What is this standard?

A: ISO 4064-1:2024 is the first part of the ISO 4064 series that sets metrological and technical requirements for water meters used to measure cold potable and hot water; it is the fifth edition and was published in December 2024.

Q: What does it cover?

A: It covers definitions of flow parameters (Q1–Q4), designation rules, accuracy classes and maximum permissible errors, temperature and pressure classes, marking and verification provisions, requirements for indicating devices, calculators and ancillary electronic devices, and references to the test and reporting procedures given in the companion parts.

Q: Who typically uses it?

A: Meter manufacturers, calibration/test laboratories, legal metrology and conformity assessment bodies, utilities, and procurement/specification teams for water distribution and billing systems.

Q: Is it current or superseded?

A: Current — ISO 4064-1:2024 supersedes and replaces ISO 4064-1:2014; the 2024 edition is the active (published) edition.

Q: Is it part of a series?

A: Yes — it is Part 1 of the ISO 4064 series. Companion parts published in the same 2024 revision include ISO 4064-2:2024 (Test methods) and ISO 4064-3:2024 (Test report format); the series is aligned with OIML R 49.

Q: What are the key keywords?

A: Water meter, Q1 Q2 Q3 Q4, accuracy class 1/2, maximum permissible error (MPE), temperature class, indicating device, calculator, ancillary device, test methods.