1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 20843:2011Petroleum and related products Determination of pH of fire-resistant fluids within categories HFAE, HFAS and HFCBS EN ISO 20843:2011 BRITISH STANDARDNational
2、forewordThis British Standard is the UK implementation of EN ISO20843:2011. It supersedes BS EN ISO 20843:2003 which is withdrawn. The UK participation in its preparation was entrusted to TechnicalCommittee MCE/18/-/16, Hydraulic fluids.A list of organizations represented on this committee can beobt
3、ained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. BSI 2011 ISBN 978 0 580 71333 0 ICS 75.120 Compliance with a British Standard cannot confer immunity fromlegal obligations.This
4、British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 January 2011. Amendments issued since publicationDate T e x t a f f e c t e dEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 20843 January 2011 ICS 75.120 Supersedes EN ISO 20843:2003Engli
5、sh Version Petroleum and related products - Determination of pH of fire-resistant fluids within categories HFAE, HFAS and HFC (ISO 20843:2011) Ptrole et produits connexes - Dtermination du pH des fluides difficilement inflammables de catgories HFAE, HFAS ou HFC (ISO 20843:2011) Minerallerzeugnisse u
6、nd verwandte Produkte - Bestimmung des pH-Wertes schwerentflammbarer Flssigkeiten 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
7、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 th
8、ree 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 b
9、odies 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
10、Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2011 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 20843:2011:
11、 EBS EN ISO 20843:2011EN ISO 20843:2011 (E) 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,
12、 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 l
13、atest 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/C
14、ENELEC 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, Lithu
15、ania, 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. BS EN ISO 20843:2011 ISO 20843:2011(
16、E) ISO 2011 All rights reserved iiiForeword 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 in
17、terested 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 Electrotechni
18、cal Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the
19、 technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights.
20、 ISO shall not be held responsible for identifying any or all such patent rights. ISO 20843 was prepared by Technical Committee ISO/TC 28, Petroleum products and lubricants. This second edition cancels and replaces the first edition (ISO 20843:2003), of which it constitutes a minor revision. BS EN I
21、SO 20843:2011 ISO 20843:2011(E) iv ISO 2011 All rights reservedIntroduction HFAE, HFAS and HFC fluids are used in hydraulic systems where the running conditions require fire-resistant fluids. The determination of the pH of aqueous hydraulic fluids is useful to monitor the product in service. Any imp
22、ortant variation can be the sign of bacterial proliferation and can have an impact on the corrosion-protection properties. BS EN ISO 20843:2011INTERNATIONAL STANDARD ISO 20843:2011(E) ISO 2011 All rights reserved 1Petroleum and related products Determination of pH of fire-resistant fluids within cat
23、egories HFAE, HFAS and HFC WARNING The use of this International Standard may involve hazardous materials, operations and equipment. This International Standard does not purport to address all of the safety problems associated with its use. It is the responsibility of the user of this International
24、Standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. 1 Scope This International Standard specifies a test method to determine the pH value of fire-resistant fluids within categories HFAE, HFAS and HFC, as classified in
25、ISO 6743-4. 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. ISO 3170:2004,
26、 Petroleum liquids Manual sampling ISO 3696:1987, Water for analytical laboratory use Specification and test methods 3 Principle The pH value is established using a pH meter, which measures the potential difference between two electrodes immersed in the fluid being tested. One of the electrodes shou
27、ld be of glass and the other should be of calomel. NOTE A grouped electrode device can also be used. The pH measurement is carried out at 20 C. The measurement should be carried out as soon as possible after sampling, less than 48 h if possible, to avoid errors due to possible oil release and/or pH
28、changing. 4 Reagents and materials 4.1 Water, conforming to Grade 2 of ISO 3696. 4.2 Standard solutions to calibrate the pH meter. 4.2.1 Buffer solution, pH 7,00 at 20 C. BS EN ISO 20843:2011 ISO 20843:2011(E) 2 ISO 2011 All rights reservedDissolve 3,800 g of potassium dihydrogen orthophosphate (KH2
29、PO4) and 3,415 g of disodium hydrogen phosphate (Na2HPO4) in water (4.1) and dilute to 1 000 ml at 20 C. Before use, the potassium dihydrogen orthophosphate shall be dried for 2 h at a temperature between 110 C and 120 C. 4.2.2 Buffer solution, pH 9,22 at 20 C. Dissolve 3,80 g of disodium tetraborat
30、e decahydrate (Na2B4O710H2O) in water (4.1) and dilute to 1 000 ml at 20 C. 4.2.3 Buffer solution, pH 11,72 at 20 C. Dissolve 1,42 g of disodium hydrogen phosphate (Na2HPO4) in a 100 ml solution of carbonate-free sodium hydroxide (NaOH) (0,1 mol/l) and dilute to 1 000 ml at 20 C with water (4.1). NO
31、TE Ready mixed buffer solutions available on the market can be used in place of the buffer solutions listed in 4.2.1 to 4.2.3. It is intended that the buffer solutions be used within the period indicated on the bottle (in the case of a ready mixed buffer) or within a period of three months after pre
32、paration. 4.3 Cleaning reagents 4.3.1 Toluene (C7H8), of analytical quality. 4.3.2 Propan-2-ol (C3H8O), of analytical quality. 5 Apparatus 5.1 pH meter. 5.2 Glass electrode and reference electrode or a grouped electrode device. 5.3 Thermometer, with a range from 0 C to 100 C graduated in 1 C. 5.4 An
33、alytical balance, capable of weighing to the nearest 0,1 mg. 6 Sampling Unless otherwise specified, samples shall be obtained by the procedures described in ISO 3170. 7 Procedure 7.1 Calibration of pH meter Calibrate the pH meter (5.1) at 20 C in accordance with the manufacturers instructions, prefe
34、rably using the buffer solutions specified in 4.2. The pH value of these solutions should lie on either side of the expected pH value of the fluid being tested. 7.2 Measurement of pH The pH measurement should be carried out as soon as possible after sampling (see Clause 6), less than 48 h if possibl
35、e, to avoid errors due to possible oil release and/or pH changing. BS EN ISO 20843:2011 ISO 20843:2011(E) ISO 2011 All rights reserved 3Pour the fluid being tested into a glass beaker and adjust to a temperature of 20 C 1 C. Carefully clean the electrodes in water (4.1), immerse them in the fluid un
36、der test, and read off the pH value from the meter (5.1) after a stabilization time of approximately 1 min. If there is an oil separation on the surface of the fluid, avoid any oil deposit on the measuring part of the glass electrode which could modify the contact potential and give rise to measurem
37、ent errors. After the test, clean the electrodes with toluene (4.3.1) followed by propan-2-ol (4.3.2). 8 Expression of results Report the pH value to the nearest 0,1 unit of pH. 9 Precision 9.1 General The precision of this test method has been estimated. 9.2 Repeatability, r The difference between
38、two test results obtained by the same operator with the same apparatus under constant operating conditions on identical test material would, in the long run, in the normal and correct operation of the test method, exceed the following value in only one case in twenty. HFAE, HFAS and HFC fluids, r =
39、0,2 9.3 Reproducibility, R The difference between two single and independent test results obtained by different operators working in different laboratories on identical test material would, in the long run, in the normal and correct operation of the test method, exceed the following value in only on
40、e case in twenty. HFAE and HFAS fluids: R = 0,6 HFC fluids: R = 0,3 10 Test report The test report shall contain at least the following information: a) a reference to this International Standard, i.e. ISO 20843:2011; b) the type and complete identification of the product tested, including, for HFAE
41、and HFAS fluids, the water type and percentage of concentrate used to make up the fluid; c) the result of the test (see Clause 8); d) any deviation, by agreement or otherwise, from the procedures specified; e) the date of the test. BS EN ISO 20843:2011 ISO 20843:2011(E) 4 ISO 2011 All rights reserve
42、dBibliography 1 ISO 6743-4, Lubricants, industrial oils and related products (class L) Classification Part 4: Family H (Hydraulic systems) BS EN ISO 20843:2011This page deliberately left blankThis page deliberately left blankBSI is the independent national body responsible for preparing British Stan
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