NF EN ISO 21178
Light conveyor belts - Determination of the electrical resistances
ISO 21178:2013 specifies test methods for determining the electrical resistances of light conveyor belts according to ISO 21183-1. The resistances are surface resistance, volume resistance perpendicular to the belt plane, and longitudinal and transverse volume resistance parallel to the belt plane. ISO 21178:2013 also specifies two test methods for determining the surface resistivity and the volume resistivity.
ISO 21178:2013 specifies test methods for determining the electrical resistances of light conveyor belts according to ISO 21183-1. The resistances are surface resistance, volume resistance perpendicular to the belt plane, and longitudinal and transverse volume resistance parallel to the belt plane. ISO 21178:2013 also specifies two test methods for determining the surface resistivity and the volume resistivity.
<p>ISO 21178:2005 specifies test methods for determining the electrical resistances of light conveyor belts according to ISO 21183-1. The resistances are surface resistance, volume resistance perpendicular to the belt plane, and longitudinal and transverse volume resistance parallel to the belt plane. ISO 21178:2005 also specifies two test methods for determining the surface resistivity and the volume resistivity.</p>
<p>This document specifies test methods for determining the electrical resistances of light conveyor belts according to ISO 21183‑1. The resistances are surface resistance, volume resistance perpendicular to the belt plane, and longitudinal and transverse volume resistance parallel to the belt plane. This document also specifies two test methods for determining the surface resistivity and the volume resistivity.</p>
- Avant-proposiv
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1 Domaine d'application1
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2 Références normatives1
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3 Symboles1
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4 Résistances électriques surfaciques2
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4.1 Méthode A: mesurage de la résistance surfacique ROA dans toutes les directions2
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4.2 Méthode B: mesurage de la résistance surfacique ROB dans les sens transversal et longitudinal5
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5 Résistivité électrique surfacique7
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5.1 Généralités7
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5.2 Principe7
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5.3 Appareillage7
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5.4 Préparation et conservation des éprouvettes avant l'essai9
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5.5 Mode opératoire9
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5.6 Expression des résultats9
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5.7 Rapport d'essai10
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6 Résistances électriques volumiques10
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6.1 Résistance volumique, RD, perpendiculaire au plan de la courroie10
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6.2 Résistance volumique, RDi, dans les sens longitudinal et transversal parallèlement au plan de la courroie15
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7 Résistivité électrique volumique18
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7.1 Détermination18
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7.2 Expression des résultats18
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7.3 Rapport d'essai18
- Annexe A (informative) Valeurs comparatives pour résistances électriques19
- BIbliographie20
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