NF EN ISO 20456

NF EN ISO 20456

October 2019
Standard Current

Measurement of fluid flow in closed conduits - Guidance for the use of electromagnetic flowmeters for conductive liquids

ISO 20456:2017 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.ISO 20456:2017 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.ISO 20456:2017 does not specify safety requirements in relation to hazardous environmental usage of the flowmeter.

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Main informations

Collections

National standards and national normative documents

Publication date

October 2019

Number of pages

40 p.

Reference

NF EN ISO 20456

ICS Codes

17.120.10   Flow in closed conduits

Classification index

X10-121

Print number

1

International kinship

ISO 20456:2017

European kinship

EN ISO 20456:2019
Sumary
Measurement of fluid flow in closed conduits - Guidance for the use of electromagnetic flowmeters for conductive liquids

ISO 20456:2017 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.

ISO 20456:2017 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.

ISO 20456:2017 does not specify safety requirements in relation to hazardous environmental usage of the flowmeter.

Replaced standards (2)
NF EN 29104
November 1993
Standard Cancelled
Measurement of fluid flow in closed conduits. Methods of evaluating the performance of electromagnetic flow-meters for liquids.

NF EN ISO 6817
November 1995
Standard Cancelled
Measurement of conductive liquid flow in closed conduits. Method using electromagnetic flow meters.

Table of contents
  • 1 Domaine d'application
  • 2 Références normatives
  • 3 Termes et définitions
  • 4 Symboles
  • 5 Théorie et formules de base
  • 6 Conception et principe de fonctionnement
  • 7 Marquage de l'équipement
  • 8 Conception de l'installation et mise en oeuvre
  • 9 Étalonnage, validation et vérification du débitmètre
  • 10 Évaluation des performances du débitmètre
  • 11 Analyse d'incertitude
  • Annexe A Matériaux de fabrication des capteurs
  • Annexe B Considérations pratiques applicables au système de mesure avec excitation par CA et CC
  • Annexe C Protection cathodique
  • Annexe D Conversion des diamètres nominaux des unités métriques en unités américaines
  • Annexe E Spécifications d'exactitude du fabricant
  • Bibliographie
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