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 (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 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 (E85) pour automobiles dans la plage d’environ (0,3 à 5) µS/cm, à une température de 25 °C (voir Article 4). 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 pour automobiles (E85). 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
ICS
71.080.60 - Alcohols. Ethers
 
75.160.20 - Liquid fuels
Technical Committee
NAD - Petroleum products, lubricants and related products
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
29-Sep-2010
Due Date
04-Dec-2010
Completion Date
07-Oct-2010
Ref Project
EN 15938:2010 - Automotive fuels - Ethanol blending component and ethanol (E85) automotive fuel - Determination of electrical conductivity

Overview

EN 15938:2010 - "Automotive fuels - Ethanol blending component and ethanol (E85) automotive fuel - Determination of electrical conductivity" is a CEN standard that defines a laboratory test method to measure the electrical conductivity of ethanol and E85 automotive fuel. The method targets the conductivity range of approximately 0.3 to 5 µS/cm at a fixed measurement temperature of 25 °C. Electrical conductivity is used as an analytical indicator of anionic and cationic contamination in ethanol-based fuels; some ionic species can cause corrosion in fuel systems.

Key topics and technical requirements

  • Measurement principle: Direct measurement of electrical conductance using a conductometer; electrical conductivity is calculated from conductance and the measuring cell’s cell constant.
  • Measurement temperature: Fixed at 25 ± 0.1 °C. The standard explicitly disallows measuring at another temperature and applying a temperature conversion to 25 °C.
  • Instrument and cell:
    • Conductometer capable of displaying to at least 0.01 µS/cm and working with alternating voltage (50–500 Hz).
    • Measuring cell made of ethanol‑compatible material (e.g., stainless steel) with a cell constant ≈ 0.1 to 1 cm⁻¹ (preferably near 0.1 cm⁻¹).
    • Thermostatable sample vessel, precise temperature sensor (±0.1 °C) and stirring to ensure uniform temperature.
  • Calibration: Single‑point calibration with a KCl calibration solution (σ25 known), determination and storage of the cell constant (recorded to 0.001 cm⁻¹).
  • Cleaning and sampling:
    • Rinse procedures using absolute ethanol and deionized water when prior saline exposure occurred.
    • Samples collected per EN ISO 3170 / EN ISO 3171; use glass bottles cleaned and rinsed with the product; avoid reactive stopper materials.
  • Quality controls: Regular cell‑constant checks and attention to interferences such as oil, suspended matter or grease.

Applications and who uses it

  • Fuel producers and blenders: Control ionic contamination in ethanol blending components and E85 before distribution.
  • Independent test laboratories and QC labs: Routine testing for batch release and compliance.
  • Refineries and storage/terminal operators: Monitoring fuel quality to prevent corrosion of storage tanks and dispensers.
  • Automotive OEMs and fuel system component suppliers: Assessing fuel compatibility and corrosion risk.
  • Regulators and standards bodies: Reference method for specifications and enforcement.

Related standards

  • EN ISO 3170 - Petroleum liquids: Manual sampling
  • EN ISO 3171 - Petroleum liquids: Automatic pipeline sampling
  • EN 15938 is based on DIN 51627‑4 and is part of CEN/TC 19 work on ethanol fuels.

Keywords: EN 15938:2010, electrical conductivity, ethanol, E85, conductometer, cell constant, KCl calibration, 25 °C, µS/cm, ethanol fuel quality.

Frequently Asked Questions

SIST EN 15938:2010 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Automotive fuels - Ethanol blending component and ethanol (E85) fuel - Determination of electrical conductivity". This standard covers: 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 fuel. Some of these components can exhibit corrosive properties.

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 fuel. Some of these components can exhibit corrosive properties.

SIST EN 15938:2010 is classified under the following ICS (International Classification for Standards) categories: 71.080.60 - Alcohols. Ethers; 75.160.20 - Liquid fuels. The ICS classification helps identify the subject area and facilitates finding related standards.

You can purchase SIST EN 15938:2010 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of SIST standards.

Standards Content (Sample)


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
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

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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