SIST EN 1149-3:2004
(Main)Protective clothing - Electrostatic properties - Part 3: Test methods for measurement of charge decay
Protective clothing - Electrostatic properties - Part 3: Test methods for measurement of charge decay
This European Standard specifies electrostatic charge decay requirements and the appropriate test method for electrostatic dissipative protective clothing to avoid incendiary discharges for materials not covered by EN 1149-1, e.g. textile materials with core conducting fibres.
Schutzkleidung - Elektrostatische Eigenschaften - Teil 3: Prüfverfahren für die Messung des Ladungsabbaus
Diese Europäische Norm legt Verfahren für die Messung des Abbaus elektrostatischer Ladung von der Oberfläche von Kleidungsmaterialien fest. Die Prüfverfahren sind für alle Materialien anwendbar, einschließlich homogener Materialien sowie inhomogener Materialien, die Fasern mit leitfähiger Oberfläche und Fasern mit leitfähiger Seele enthalten.
Vetements de protection - Propriétés électrostatiques - Partie 3: Méthodes d'essai pour la mesure de l'atténuation de la charge
La présente norme européenne définit les méthodes de mesure de la dissipation de la charge électrostatique de la surface des matériaux pour vetements. Les méthodes d'essai s'appliquent a tous les matériaux, y compris les matériaux homogenes et non homogenes formés de fibres a surface conductrice et de fibres a c?ur conducteur.
Varovalna obleka - Elektrostatične lastnosti – 3. del: Preskusne metode za merjenje razelektritve
General Information
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Protective clothing - Electrostatic properties - Part 3: Test methods for measurement of charge decayVetements de protection - Propriétés électrostatiques - Partie 3: Méthodes d'essai pour la mesure de l'atténuation de la chargeSchutzkleidung - Elektrostatische Eigenschaften - Teil 3: Prüfverfahren für die Messung des Ladungsabbaus13.340.10Varovalna oblekaProtective clothingICS:SIST EN 1149-3:2004enTa slovenski standard je istoveten z:EN 1149-3:200401-julij-2004SIST EN 1149-3:2004SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 1149-3April 2004ICS 13.340.10English versionProtective clothing - Electrostatic properties - Part 3: Testmethods for measurement of charge decayVêtements de protection - Propriétés électrostatiques -Partie 3: Méthodes d'essai pour la mesure de l'atténuationde la chargeSchutzkleidung - Elektrostatische Eigenschaften - Teil 3:Prüfverfahren für die Messung des LadungsabbausThis European Standard was approved by CEN on 2 February 2004.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2004 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 1149-3:2004: E
EN 1149-3:2004 (E)2ContentpageForeword.31Scope.52Normative references.53Terms and definitions.54Test methods.65Reporting.12Annex A (informative)
Explanatory notes.19Annex ZA (informative)
Clauses of this European Standard addressing essential requirements orother provisions of EU Directives.20
EN 1149-3:2004 (E)3ForewordThis document (EN 1149-3:2004) has been prepared by Technical Committee CEN/TC 162 “Protective clothingincluding hand and arm protection and life jackets”, the secretariat of which is held by DIN.This European Standard shall be given the status of a national standard, either by publication of an identical text orby endorsement, at the latest by October 2004, and conflicting national standards shall be withdrawn at the latestby October 2004.This document has been prepared under a mandate given to CEN by the European Commission and the EuropeanFree Trade Association, and supports essential requirements of EU Directive(s).For relationship with EU Directive(s), see informative annex ZA, which is an integral part of this document.Annex A is informative.EN 1149 consists of the following parts, under the general title "Protective clothing – Electrostatic properties":¾ Part 1: Surface resistivity (Test methods and requirements)¾ Part 2: Test method for measurement of the electrical
resistance through a material
(vertical resistance)¾ Part 3: Test methods for measurement of charge decay¾ Part 41): Garment tests¾ Part 51): Performance requirementsAccording to the CEN/CENELEC Internal Regulations, the national standards organizations of the followingcountries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark,Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
1) In course of preparation.
EN 1149-3:2004 (E)4IntroductionThis European Standard is part of a series of test methods and requirements for electrostatic properties ofprotective clothing. Different parts are necessary, because of the various fields of application and diverse nature ofgarment materials.Two test methods are described for measuring the rate of dissipation of electrostatic charge of garment materials,i.e. the charge decay.
In both cases, charge is monitored by observation of the electrostatic field it generates andthis is done using non-contacting field measuring instruments.
The principal difference between the methods is thetechnique used to generate the electrostatic charge.
Triboelectric charging relies on the charge generated as twomaterials come into contact, rub together and subsequently separate. Induction charging involves an electrodeplaced beneath the test surface and is raised to a defined potential.
Induced charge on the test material influencesthe net field that is observed by a field-measuring probe positioned above the test surface.
EN 1149-3:2004 (E)51 ScopeThis European Standard specifies methods for measuring the dissipation of electrostatic charge from the surface ofmaterials for garments. The test methods are applicable to all materials, including homogeneous materials andinhomogeneous materials with surface conducting fibres and core conducting fibres.2 Normative referencesThis European Standard incorporates by dated or undated reference, provisions from other publications. Thesenormative references are cited at the appropriate places in the text, and the publications are listed hereafter. Fordated references, subsequent amendments to or revisions of any of these publications apply to this EuropeanStandard only when incorporated in it by amendment or revision. For undated references the latest edition of thepublication referred to applies (including amendments).EN 340:2003, Protective clothing — General requirements.EN 1149-1:1995, Protective clothing — Electrostatic properties — Part 1: Surface resistivity (test methods andrequirements).3 Terms and definitionsFor the purposes of this European Standard, the terms and definitions of EN 340:2003 and EN 1149-1:1995together with the following apply.3.1surface conducting fibrefibre in which the conducting component is exposed at the surface.
Depending on the cross-section of the fibre, allor only part of its surface may be conducting3.2core conducting fibrefibre in which the conducting component is completely encapsulated in non-conducting material3.3charge decaymigration of charge across or through a material leading to a reduction of charge density or surface potential at thepoint where the charge was deposited3.4Electric field strength3.4.1test method 1E0 - maximum electric field strength after triboelectric charging (kV/m);E30 - electric field strength 30 s after E0 (kV/m)3.4.2test method 2Emax - electric field strength indicated on the recording device with no test specimen present (kV/m);ER - maximum electric field strength indicated on the recording device with the test specimen in the measuringposition
EN 1149-3:2004 (E)63.5half decay time t50the time taken for the indicated field strength to decay to Emax/2 (s)3.6shielding factor Srelationship between Emax and ER calculated as:max1EESR-=4 Test methods4.1 Sample preparation and conditioning applicable for both test methods4.1.1 Pre-treatmentThe test sample shall be pre-treated according to the specific clothing standard or otherwise shall undergo fivecycles of cleaning according to EN 340.NOTEPre-treatment is not required for garments not intended to be cleaned in use (e.g. for single use garments).4.1.2 Atmosphere for conditioning and testingUnless otherwise specified, the test specimens shall be conditioned for at least 24 hours in an atmosphere of(23 ± 1) °C and (25 ± 5) % relative humidity.
Testing shall be performed in the same atmosphere.4.2 Triboelectric charging (test method 1)4.2.1 PrincipleTest materials are charged by rubbing against cylindrical rods mounted on a vertically running slider.
The electricalfield strength from the charge generated on the test material is observed and recorded using an electrostaticfieldmeter connected to a graphical recording device.
EN 1149-3:2004 (E)74.2.2 Equipment4.2.2.1 GeneralThe test apparatus is shown in Figure 1.4.2.2.2 Cylindrical rodsTwo rods of length (100 ± 5) mm with a circular cross-section of diameter (15,0 ± 0,5) mm are used.
The rods areattached to a metal slider in a parallel fashion without freedom of rotation such that the bottom of the first rod ishorizontally in line with the top of the second rod and with a distance of (15 ± 1) mm between their nearest edges(see Figure 1).Two pairs of rods are required, one pair made from high density polyethylene (HDPE) and one pair made fromaluminium.
The fixture used to attach the rods to the slider shall allow rods to be interchanged.The HDPE rods shall have a specific gravity of (999 ± 10) kg/m³ and shore hardness
D of 63; surface resistance of£ 106 W and volume resistivity of £ 106 W cm.The material for aluminium rods shall be:AlMgSi(3.3207;6060)NOTEProducer of the HDPE-material (PE-EL): SIMONA AG, D-55606 Kirn. This information is given for the convenienceof users of this standard and does not constitute an endorsement by CEN/TC 162 of the product named. Equivalent productsmay be used if they can shown to lead to the same results.4.2.2.3 Slider and support structureThe slider to which the cylindrical rods are attached runs on one or more vertical guide rail(s).
The start position ofthe slider is the highest point on the guide rail(s).
The slider is either allowed to fall freely under its own weight, oris driven down the guide rail(s) by a suitable motor.
In the former case, a suitable clamp is required to lock theslider in the start position prior to each measurement.
The slider, guide rail(s) and support framework shall be ofany design that satisfies the requirement of allowing the cylindrical rods to move down at a velocity of(0,20 ± 0,02) m/s in a vertical direction without significant twisting or rotation.
All metalwork shall be connected toearth.4.2.2.4 Specimen clamp and tensioning deviceThe upper edge of the specimen is clamped to a rigid structure and is tensioned by attaching a free-hanging clampto the bottom edge. The free-hanging clamp shall be such that the load evenly applied to the full width of thespecimen. The fixed clamp shall be metal and shall be connected to earth.
The load applied to the test specimenby the bottom clamp shall be (1,30 ± 0,05) N. In case elongation of the test specimen is larger than 5 % then a loadof (0,2 ± 0,05) N shall be used.4.2.2.5 FieldmeterAn electrostatic fieldmeter meeting at least the following specification is positioned with its sensing aperture(50 ± 5) mm from the plane of the test specimen (see Figure 2) when the slider has decended:range: at least 1 kV/m to
200 kV/m;resolution: £ 1 kV/m;response time: £ 10 ms;zero drift: ± 0,5 kV/m (long term) or better.
EN 1149-3:2004 (E)8The fieldmeter shall have an output function that allows connection to a recording device.NOTECare should be taken to avoid presence of charged objects that can influence the reading of the fieldmeter.4.2.2.6 Recording deviceA means of recording time related data fr
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