NA 152

DIN Standards Committee Technical Fundamentals


Measurement of fluid flow in closed conduits - Guidance for the use of electromagnetic flowmeters for conductive liquids (ISO 20456:2017); German version EN ISO 20456:2019


This document applies to industrial electromagnetic flowmeters used for the measurement of flowrate of a conductive liquid in a closed conduit running full. It covers flowmeter types utilizing both alternating current (AC) and pulsed direct current (DC) circuits to drive the field coils and meters running from a mains power supply and those operating from batteries or other sources of power. This document is not applicable to insertion-type flowmeters or electromagnetic flowmeters designed to work in open channels or pipes running partially full, nor does it apply to the measurement of magnetically permeable slurries or liquid metal applications. This document does not specify safety requirements in relation to hazardous environmental usage of the flowmeter.





Planned document number

DIN EN ISO 20456

Project number


Responsible national committee

NA 152-04-02 AA - Flow and volume 

Responsible international committee

ISO/TC 30/SC 5 - Velocity and mass methods 

draft standard

Measurement of fluid flow in closed conduits - Guidance for the use of electromagnetic flowmeters for conductive liquids (ISO 20456:2017); German and English version prEN ISO 20456:2019
Order from Beuth Verlag

previous edition(s)

Measurement of conductive liquid flow in closed conduits - Methods using electromagnetic flow-meters (ISO 6817:1992); German version EN ISO 6817:1995

Order from Beuth Verlag

Measurement of fluid flow in closed conduits; methods of evaluating the performance of electromagnetic flow-meters for liquids (ISO 9104:1991); German version EN 29104:1993

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Tobias Hübner

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