Similar International Standards
ISO 4064-1:2017International Organization for Standardization (ISO), International
HighCurrent
Water meters for cold potable water and hot water — Part 1: Metrological and technical requirements
Covers metrological and technical requirements for bulk water meters, but with modern performance classes.
OIML R 49-1:2013International Organization of Legal Metrology (OIML), International
HighCurrent
Water meters intended for the metering of cold potable water and hot water - Part 1: Metrological and technical requirements
Provides the internationally agreed-upon recommendations that form the basis for ISO 4064.
EN 14154-1:2005+A2:2011European Committee for Standardization (CEN), Europe
MediumCurrent
Water meters - Part 1: General requirements
European standard harmonized with older versions of ISO 4064, covering similar meter types.
AWWA C701-20American Water Works Association (AWWA), USA
MediumCurrent
Cold-Water Meters—Turbine Type, for Customer Service
Specifically covers turbine-type bulk meters, one of the main types included in IS 2373.
Key Differences
≠IS 2373 uses outdated metrological Classes (A and B), whereas modern standards like ISO 4064 use a flowrate ratio 'R' (Q3/Q1) which provides a much wider and more specific range of performance levels (e.g., R100 to R800+).
≠The flow rate nomenclature differs. IS 2373 uses 'minimum', 'transitional', and 'maximum' flow, while ISO 4064 uses a more defined system of Q1 (minimum), Q2 (transitional), Q3 (permanent), and Q4 (overload).
≠IS 2373:1981 is designed for purely mechanical meters. It contains no provisions for electronic registers, remote reading outputs, or communication protocols, which are extensively covered in current international standards.
≠ISO 4064 and OIML R 49 include detailed requirements for sensitivity to flow disturbances, specifying required straight pipe lengths upstream (U) and downstream (D) of the meter (e.g., U5/D3), which is not specified in IS 2373.
Key Similarities
≈All standards cover the same fundamental application: metering the volume of cold potable water in large, filled, closed conduits for billing or network management.
≈The basic accuracy requirement structure is consistent: a wider tolerance (±5%) is permitted in the lower flow region, and a tighter tolerance (±2%) is required for the main operational (upper) flow region.
≈Both IS 2373 and its international counterparts specify requirements for materials to be non-toxic and resistant to internal and external corrosion, ensuring durability and water safety.
≈Core constructional requirements such as the need for a clear, legible register, markings for direction of flow, and identification of the manufacturer and nominal size are common across all standards.