Automotive fuels - Ethanol blending component and ethanol (E85) fuel - Determination of electrical conductivity

This European Standard specifies a test method for the determination of the electrical conductivity in ethanol and ethanol (E85) automotive fuel in the range from approximately (0,3 to 5) μS/cm at a temperature of 25 °C. The electrical conductivity is determined from the measured electrical conductance. The electrical conductivity is an important analytical criterion for the ascertainment and control of anionic and cationic components in ethanol and ethanol (E85) automotive fuel. Some of these components can exhibit corrosive properties.

Kraftstoffe für Kraftfahrzeuge - Ethanol Mischungskomponent und Ethanolkraftstoff (E85) - Bestimmung der elektrischen Leitfähigkeit

Diese Europäische Norm legt ein Prüfverfahren zur Bestimmung der elektrischen Leitfähigkeit in Ethanol und Etha¬nolkraftstoff (E85) bei einer Temperatur von 25 °C im Bereich von etwa 0,3 µS/cm bis etwa 5 µS/cm fest (siehe Abschnitt 4). Die elektrische Leitfähigkeit wird aus dem gemessenen elektrischen Leitwert ermittelt.
Die elektrische Leitfähigkeit ist ein wichtiges analytisches Kriterium zur Erfassung und Kontrolle von anio-nischen und kationischen Bestandteilen in Ethanol und Ethanolkraftstoff. Einige dieser Bestandteile können korrosive Eigenschaften aufweisen.

Carburants pour automobiles - Ethanol comme base de mélange à l'essence et carburant éthanol (E85) - Détermination de la conductivité électrique

Le présent document prescrit une méthode d’essai permettant de déterminer la conductivité électrique de l’éthanol et du carburant éthanol dans la plage d’environ (0,3 à 5) µS/cm, à une température de 25 °C. La conductivité électrique est déterminée à partir de la conductance électrique mesurée.
La conductivité électrique est un critère d’analyse important pour la détermination et le contrôle des composants anioniques et cationiques dans l’éthanol et le carburant éthanol. Certains de ces composants peuvent avoir des propriétés corrosives.

Goriva za motorna vozila - Etanolna komponenta za dodajanje in gorivo etanol (E85) - Določevanje električne prevodnosti

Ta evropski standard določa preskusno metodo za določevanje električne prevodnosti v etanolu in gorivu etanol (E85) v razponu od približno 0,3 do 5 μS/cm pri temperaturi 25 °C. Električna prevodnost se določi iz izmerjene električne prevodnosti. Električna prevodnost je pomembno analitično merilo za preverjanje in nadzor anionskih in kationskih komponent v etanolu in gorivu etanol (E85) za motorna vozil. Nekatere izmed teh komponent lahko kažejo korozivne lastnosti.

General Information

Status
Published
Public Enquiry End Date
24-Aug-2009
Publication Date
06-Oct-2010
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
29-Sep-2010
Due Date
04-Dec-2010
Completion Date
07-Oct-2010

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Kraftstoffe für Kraftfahrzeuge - Ethanol Mischungskomponent und Ethanolkraftstoff (E85) - Bestimmung der elektrischen LeitfähigkeitCarburants pour automobiles - Ethanol comme base de mélange à l'essence et carburant éthanol (E85) - Détermination de la conductivité électriqueAutomotive fuels - Ethanol blending component and ethanol (E85) fuel - Determination of electrical conductivity75.160.20Liquid fuels71.080.60Alkoholi. EtriAlcohols. EthersICS:Ta slovenski standard je istoveten z:EN 15938:2010SIST EN 15938:2010en,de01-november-2010SIST EN 15938:2010SLOVENSKI

STANDARD
SIST EN 15938:2010
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 15938
September 2010 ICS 75.160.20 English Version

Automotive fuels - Ethanol blending component and ethanol (E85) automotive fuel - Determination of electrical conductivity

Carburants pour automobiles - Éthanol comme base de mélange à l'essence et carburant éthanol (E85) pour automobiles - Détermination de la conductivité électrique

Kraftstoffe für Kraftfahrzeuge - Ethanol als Blendkomponente und Ethanolkraftstoff (E85) - Bestimmung der elektrischen Leitfähigkeit This European Standard was approved by CEN on 7 August 2010.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN Management Centre or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,

B-1000 Brussels © 2010 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 15938:2010: ESIST EN 15938:2010

EN 15938:2010 (E) 2 Contents Page Foreword ..............................................................................................................................................................31Scope ......................................................................................................................................................42Normative references ............................................................................................................................43Terms and definitions ...........................................................................................................................44Principle ..................................................................................................................................................55Reagents .................................................................................................................................................66Apparatus ...............................................................................................................................................67Sampling .................................................................................................................................................68Procedure ...............................................................................................................................................78.1Preparation of the measuring device...................................................................................................78.1.1General ....................................................................................................................................................78.1.2Cleaning of the sample vessel .............................................................................................................78.1.3Cleaning of the measuring cell .............................................................................................................78.1.4Filling the sample into the sample vessel ...........................................................................................78.2Calibration ..............................................................................................................................................78.2.1Interferences ..........................................................................................................................................78.2.2Checking the cell constant ...................................................................................................................88.3Measurement procedure .......................................................................................................................89Expression of results ............................................................................................................................810Precision .................................................................................................................................................810.1General ....................................................................................................................................................810.2Repeatability, r .......................................................................................................................................810.3Reproducibility, R...................................................................................................................................911Test report ..............................................................................................................................................9Bibliography ..................................................................................................................................................... 10 SIST EN 15938:2010

EN 15938:2010 (E) 3 Foreword This document (EN 15983:2010) has been prepared by Technical Committee CEN/TC 19 “Gaseous and liquid fuels, lubricants and related products of petroleum, synthetic and biological origin”, the secretariat of which is held by NEN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by March 2011, and conflicting national standards shall be withdrawn at the latest by March 2011. This document was prepared by CEN/TC 19  Ethanol Task Force under responsibility of its Working Group 21 and is based on DIN 51627-4 [1]. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. SIST EN 15938:2010

EN 15938:2010 (E) 4 1 Scope This European Standard specifies a test method for the determination of the electrical conductivity in ethanol and ethanol (E85) automotive fuel in the range from approximately (0,3 to 5) µS/cm at a temperature of 25 °C (see Clause 4). The electrical conductivity is determined from the measured electrical conductance. The electrical conductivity is an important analytical criterion for the ascertainment and control of anionic and cationic components in ethanol and ethanol (E85) automotive fuel. Some of these components can exhibit corrosive properties. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN ISO 3170, Petroleum liquids — Manual sampling (ISO 3170:2004) EN ISO 3171, Petroleum liquids — Automatic pipeline sampling (ISO 3171:1988) 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 electrical conductance G reciprocal value of the electrical resistance NOTE The electrical conductance is expressed in siemens (S) or Ω–1. 3.2 electrical resistance R measurement value of a sample, directly determined by means of the conductivity meter, which increases with the sample length l and decreases with the sample cross-section A NOTE The electrical resistance of a sample is expressed in ohms (Ω). The relation between R and the electrical conductance (3.1) is shown in Equation (1). RG1= (1) 3.3 electrical conductivity σT material-dependent measure of the electrical current conducted in an electrical field by the ions present in the solution NOTE 1 The material-dependent electrical conductivity of a solution is related to the electrical current which is achieved by moving ions of the solution in an electrical field. It is therefore applicable as a method to limit ionic contamination in alcohols and alcohol based fuels. The electrical conductivity σT is determined in accordance with Equation (2) from the determined electrical conductance G (3.1) and the geometrical dimensions of the measuring cell (length and effective cross-section) which are added to form the cell constant K (3.4): SIST EN 15938:2010

EN 15938:2010 (E) 5 KGAlG⋅=⋅=Tσ (2) where: σT is the electrical conductivity of the sample, in µS cm-1 (1 S m-1 = 104 µS cm-1), at the measurement temperature T, in °C; l is the length of the measured section (geometrical electrode gap), in m or, following the respective unit conversion, in cm, with 1 m = 100 cm;

A is the effective cross-section of the measuring cell, in m2 or, following the respective unit conversion, in cm2, with 1 m2 = 104 cm2; K is the cell constant of the measuring cell in m–1 or, following the respective unit conversion, in cm–1, with

1 m–1 = 0,01 cm–1. NOTE 2 The electrical conductivity of a solution depends on the temperature; therefore the temperature is given together with the measurement value. Hence, the electrical conductivity, which is mostly determined at 25 °C, is designated as σ25. NOTE 3 The electrical conductivity depends on ion concentration, ion type, temperature and viscosity of the solution. Therefore its measurement range can be large. "Ultrapure" (deionized and demineralised) water for example, due to its self-dissociation at 25 °C, has an electrical conductivity of 0,054 83 µS cm-1 (5,483 µS m-1). 3.4 cell constant K geometrical dimension of the measuring cell used to form one value NOTE The electrical conductivity σ (3.3) cannot be calculated simply from the electrical resistance R (3.2) a

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