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.
Vêtements 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 vêtements. Les méthodes d'essai s'appliquent à tous les matériaux, y compris les matériaux homogènes et non homogènes formés de fibres à surface conductrice et de fibres à 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
Explanatory notes.19Annex ZA (informative)
Clauses of this European Standard addressing essential requirements orother provisions of EU Directives.20
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.
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.
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
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.
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.
The time resolutionand response time of the recording device shall be 1 ms or less, and it shall be capable of recording the full rangeof output from the fieldmeter.
Examples of suitable devices include paper chart recorders, storage oscilloscopes,and data-loggers/computers with appropriate software.4.2.2.7 Static neutraliserA means of neutralising electrostatic charge on test specimens and HDPE rods prior to measurement, e.g. electricair ionisation.4.2.2.8 Cleaning agentAn appropriate liquid cleaning agent, is either propan-2-ol or ethanol.WARNING: Propan-2-ol and ethanol are highly flammable and harmful to health.
Avoid breathing the vapour andcontact with skin, eyes or clothing.4.2.3 SpecimensCut twelve specimens each measuring (50 ± 2) mm ´ (300 ± 2) mm from the sample fabric or garment, six cut withthe long dimension in the warp or machine direction and six in the weft or width direction. In case the machinedirection can not be identified six specimen shall be cut from each of two orthogonal directions. Three specimens inwarp and three specimens in weft to be used with HDPE rods and three specimens in warp and three specimensin weft to be used with aluminium rods.
Specimen shall not contain seams. Handle the specimens only at theedges to avoid contamination.4.2.4 ProcedureClean the cylindrical rods by wiping with a paper tissue moistened with the cleaning agent (4.2.2.7).
Allow thecylindrical rods to dry.Secure one end of the first specimen to the fixed clamp and with the slider in its highest position, pass the free endof the specimen between the two rods.
The specimen should contact the first rod on its bottom surface and thesecond rod on its top surface (see Figure 2).
Attach the tensioning device to the free end of the specimen.Remove any significant residual electrostatic charge from the specimen and rods using the static neutraliser.Ensure that the fieldmeter is showing a zero or near-zero reading.Start the recording device and release the slider, allowing it to fall, or be driven down so that the specimen rubsover the cylindrical rods.Stop the recording device 60 s after release of the slider.From the recording, note the maximum field strength readin
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