NF EN 29104
Measurement of fluid flow in closed conduits. Methods of evaluating the performance of electromagnetic flow-meters for liquids.
<p>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.</p> <p>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.</p> <p>ISO 20456:2017 does not specify safety requirements in relation to hazardous environmental usage of the flowmeter.</p>
-
1 Domaine d'application1
-
2 Références normatives1
-
3 Définitions2
-
4 Mode opératoire général d'essai2
-
4.1 Conditions générales3
-
4.2 Installation3
-
4.3 Liquide d'essai4
-
4.4 Conditions d'essai relatives à l'environnement4
-
4.5 Conditions nominales d'étalonnage pendant les essais5
-
4.6 Signal de sortie5
-
4.7 Vérification du zéro5
-
4.8 Autres conditions5
-
4.9 Étalonnage du débitmètre - Conditions requises et méthodes5
-
5 Évaluation de l'effet des grandeurs d'influence6
-
5.1 Généralités6
-
5.2 Influences internes7
-
5.3 Influences extérieures11
-
6 Essais pour l'évaluation des effets d'autres grandeurs d'influence17
-
6.1 Influence magnétique17
-
6.2 Impédance de charge de sortie17
-
6.3 Dérive à long terme17
-
6.4 Courants de fuite dans le liquide17
-
6.5 Perturbations radioélectriques17
- Annexe
- A Bibliographie18
COBAZ is the simple and effective solution to meet the normative needs related to your activity, in France and abroad.
Available by subscription, CObaz is THE modular solution to compose according to your needs today and tomorrow. Quickly discover CObaz!
Request your free, no-obligation live demo
I discover COBAZ