EN ISO 20843:2011

Petroleum and related products - Determination of pH of fire-resistant fluids within categories HFAE, HFAS and HFC (ISO 20843:2011)

ISO 20843:2011 specifies a test method to determine the pH value of fire-resistant fluids within categories HFAE, HFAS and HFC, as classified in ISO 6743‑4.

Mineralölerzeugnisse und verwandte Produkte - Bestimmung des pH-Wertes schwerentflammbarer Flüssigkeiten der Kategorien HFAE, HFAS und HFC (ISO 20843:2011)

Diese Internationale Norm legt ein Prüfverfahren zur Bestimmung des pH-Wertes von schwer entflammbaren
Flüssigkeiten der Kategorien HFAE, HFAS und HFC fest, die in ISO 6743-4 klassifiziert sind.

Pétrole et produits connexes - Détermination du pH des fluides difficilement inflammables de catégories HFAE, HFAS ou HFC (ISO 20843:2011)

L'ISO 20843:2011 spécifie une méthode d'essai permettant de déterminer la valeur du pH des fluides difficilement inflammables des catégories HFAE, HFAS et HFC, tels que classés selon l'ISO 6743-4.

Naftni in sorodni proizvodi - Določevanje pH vrednosti tekočin, odpornih proti ognju, iz skupin HFAE, HFAS in HFC (ISO 20843:2011)

Ta mednarodni standard določa preskusno metodo za določevanje pH vrednosti tekočin, odpornih proti ognju, v skupinah HFAE, HFAS in HFC, kot je klasificirano v ISO 6743-4.

General Information

• Status: Published
• Publication Date: 14-Jan-2011
• Withdrawal Date: 30-Jul-2011
• ICS: 75.120 - Hydraulic fluids
• Technical Committee: CEN/TC 19 - Petroleum products, lubricants and related products
• Drafting Committee: CEN/TC 19 - Petroleum products, lubricants and related products
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 15-Jan-2011
• Completion Date: 15-Jan-2011
• Directive: 92/104/EC - Council Directive 92/104/EEC of 3 December 1992 on the minimum requirements for improving the safety and health protection of workers in surface and underground mineral-extracting industries (twelfth individual Directive within the meaning of Article 16 (1) of Directive 89/391/EEC)
• Mandate: M/238 - Mandate to CEN for standardization in the field of fire-resistant hydraulic fluids used for power transmission and control (hydrostatic and hydrokinetic)
• Ref Project: SIST EN ISO 20843:2011 - Petroleum and related products - Determination of pH of fireresistant fluids within categories HFAE, HFAS and HFC (ISO 20843:2011)

Relations

• Replaces: EN ISO 20843:2003 - Petroleum and related products - Determination of pH of fire-resistant fluids within categories HFAE, HFAS and HFC (ISO 20843:2003)
• Effective Date: 22-Jan-2011

Overview

EN ISO 20843:2011 is an international standard developed by CEN and ISO for the determination of the pH value of fire-resistant fluids within categories HFAE, HFAS, and HFC, as classified under ISO 6743-4. This standard specifies a precise test method to measure pH using calibrated pH meters with glass and calomel electrodes, ensuring accurate monitoring of fire-resistant hydraulic fluids. The ability to determine pH is crucial for assessing the fluid’s condition, particularly to detect changes that may indicate bacterial proliferation or corrosion risks in hydraulic systems requiring fire-resistant properties.

Key Topics

• Scope and Purpose
  Specifies the test method for pH determination of fire-resistant fluids used in hydraulic applications, ensuring fluid integrity and system safety.

• Relevant Fluid Categories
  Focuses on fluids classified as HFAE (water-in-oil emulsions), HFAS (synthetic aqueous solutions), and HFC (water-glycol solutions).

• Sampling and Sample Handling
  Samples must be collected according to ISO 3170 standards, and measurements performed within 48 hours of sampling to avoid pH alterations caused by oil separation or microbial activity.

• Test Procedure

  • Calibration of the pH meter at 20 °C using buffer solutions (pH 7.00, 9.22, 11.72)
  • Measurement of fluid pH at 20 °C ± 1 °C after electrode cleaning
  • Avoid oil deposits on electrodes to prevent measurement errors
  • Use reagents including Grade 2 water, toluene, and propan-2-ol for cleaning

• Equipment Requirements
  Utilizes a pH meter equipped with glass and calomel or grouped electrodes, a thermometer, and an accurate analytical balance.

• Precision and Reporting

  • Repeatability: 0.2 pH units
  • Reproducibility: 0.3 to 0.6 pH units depending on fluid category
  • Test reports should reference EN ISO 20843:2011, specify product details, test results, any deviations, and testing dates.

Applications

• Hydraulic System Maintenance
  Monitoring the pH of fire-resistant fluids helps identify early signs of degradation or contamination, such as acidification or alkalinity changes due to bacterial growth or chemical breakdown.

• Quality Control in Petroleum Products
  Manufacturers and users of fire-resistant hydraulic fluids can employ this standard to ensure fluid quality meets safety and performance criteria for industrial applications.

• Corrosion Protection Evaluation
  pH measurement supports corrosion management by signaling conditions that might compromise protective properties of hydraulic fluids.

• Regulatory Compliance
  Use of this standardized test method assists organizations in meeting industry and safety regulations involving hydraulic fluids in fire-risk environments.

Related Standards

• ISO 6743-4
  Classification of hydraulic fluid types including categories HFAE, HFAS, and HFC relevant to this pH test method.

• ISO 3170:2004
  Guidelines for manual sampling of petroleum liquids, critical for obtaining representative fluid samples.

• ISO 3696:1987
  Specifies the quality requirements for water used in analytical laboratory testing, such as in the preparation of reagents.

• ISO 20843:2003
  Previous edition of the standard, superseded by the 2011 revision to improve test method accuracy and applicability.

---

By adhering to EN ISO 20843:2011, professionals in petroleum products and hydraulic system industries can ensure precise pH determination of fire-resistant fluids, contributing to system reliability, safety, and longevity in demanding operational environments.

Standards Content (Sample)

SLOVENSKI STANDARD
01-marec-2011
1DGRPHãþD
SIST EN ISO 20843:2004
1DIWQLLQVRURGQLSURL]YRGL'RORþHYDQMHS+YUHGQRVWLWHNRþLQRGSRUQLKSURWL
RJQMXL]VNXSLQ+)$(+)$6LQ+)&,62
Petroleum and related products - Determination of pH of fireresistant fluids within
categories HFAE, HFAS and HFC (ISO 20843:2011)
Mineralölerzeugnisse und verwandte Produkte - Bestimmung des pH-Wertes
schwerentflammbarer Flüssigkeiten der Kategorien HFAE, HFAS und HFC (ISO
20843:2011)
Pétrole et produits connexes - Détermination du pH des fluides difficilement
inflammables de catégories HFAE, HFAS ou HFC (ISO 20843:2011)
Ta slovenski standard je istoveten z: EN ISO 20843:2011
ICS:
75.080 Naftni proizvodi na splošno Petroleum products in
general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 20843
NORME EUROPÉENNE
EUROPÄISCHE NORM
January 2011
ICS 75.120 Supersedes EN ISO 20843:2003
English Version
Petroleum and related products - Determination of pH of fire-
resistant fluids within categories HFAE, HFAS and HFC (ISO
20843:2011)
Pétrole et produits connexes - Détermination du pH des Mineralölerzeugnisse und verwandte Produkte -
fluides difficilement inflammables de catégories HFAE, Bestimmung des pH-Wertes schwerentflammbarer
HFAS ou HFC (ISO 20843:2011) Flüssigkeiten der Kategorien HFAE, HFAS und HFC (ISO
20843:2011)
This European Standard was approved by CEN on 3 January 2011.

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-CENELEC 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-CENELEC 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
© 2011 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 20843:2011: E
worldwide for CEN national Members.

Contents Page
Foreword .3

Foreword
This document (EN ISO 20843:2011) has been prepared by Technical Committee ISO/TC 28 "Petroleum
products and lubricants" in collaboration with 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 July 2011, and conflicting national standards shall be withdrawn at the
latest by July 2011.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 20843:2003.
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.
Endorsement notice
The text of ISO 20843:2011 has been approved by CEN as a EN ISO 20843:2011 without any modification.

INTERNATIONAL ISO
STANDARD 20843
Second edition
2011-01-15
Petroleum and related products —
Determination of pH of fire-resistant
fluids within categories HFAE, HFAS and
HFC
Pétrole et produits connexes — Détermination du pH des fluides
difficilement inflammables de catégories HFAE, HFAS ou HFC

Reference number
ISO 20843:2011(E)
©
ISO 2011
ISO 20843:2011(E)
PDF disclaimer
This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but
shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In
downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat
accepts no liability in this area.
Adobe is a trademark of Adobe Systems Incorporated.
Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation
parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In
the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.

©  ISO 2011
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or
ISO's member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail [e-mail]
Web www.iso.org
Published in Switzerland
ii © ISO 2011 – All rights reserved

ISO 20843:2011(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted i
...