BS-EN-ISO-7726-2001.pdf
BRITISH STANDARD BS EN ISO 7726:2001 Incorporating Corrigendum No. 1 Ergonomics of the thermal environment Instruments for measuring physical quantities The European Standard EN ISO 7726:2001 has the status of a British Standard ICS 13.180 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 01:55:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 7726:2001 This British Standard, having been prepared under the direction of the Health and Environments Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 06 November 2001 © BSI 20 February 2002 ISBN 0 580 38651 1 National foreword This British Standard is the official English language version of EN ISO 7726:2001. It is identical with ISO 7726:1998 and supersedes BS EN 27726:1994 (ISO 7726:1985), which is withdrawn. The UK participation in its preparation was entrusted by Technical Committee PH/9, Applied Ergonomics, to Subcommittee PH/9/1, Thermal Environments, which has the responsibility to: A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN ISO title page, the EN ISO foreword page, the ISO title page, pages ii to iv, pages 1 to 51, the annex ZA page, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments 13697 Corrigendum No. 1 20 February 2002 Addition of supersession details Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 01:55:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM EN ISO 7726 July 2001 ICS 13.180Supersedes EN 27726:1993 English version Ergonomics of the thermal environment - Instruments for measuring physical quantities (ISO 7726:1998) Ergonomie des ambiances thermiques - Appareils de mesure des grandeurs physiques (ISO 7726:1998) Umgebungsklima - Instrumente zur Messung physikalischer Größen (ISO 7726:1998) This European Standard was approved by CEN on 10 May 2001. 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 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 Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels © 2001 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 7726:2001 E Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 01:55:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI I NESO 77:6202( 10E) 2 Foreword The text of the International Standard from Technical Committee ISO/TC 159 “Ergonomics“ of the International Organization for Standardization (ISO) has been taken over as an European Standard by Technical Committee CEN/TC 122 “Ergonomics“, the secretariat of which is held by DIN. This European Standard replaces EN 27726:1993. 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 January 2002, and conflicting national standards shall be withdrawn at the latest by January 2002. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of the International Standard ISO 7726:1998 has been approved by CEN as a European Standard without any modification. NOTE: Normative references to International Standards are listed in annex ZA (normative). EN ISO 7726:2001 Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 01:55:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI A Reference number ISO 7726:1998(E) INTERNATIONAL STANDARD ISO 7726 Second edition 1998-11-01 Ergonomics of the thermal environment Instruments for measuring physical quantities Ergonomie des ambiances thermiques Appareils de mesure des grandeurs physiques EN ISO 7726:2001 Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 01:55:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii Contents Page 1Scope.1 2Normative reference1 3General1 4Measuring instruments 2 5Specifications relating to measuring methods.5 Annex A Measurement of air temperature.12 Annex B Measurement of the mean radiant temperature14 Annex C Measurement of plane radiant temperature28 Annex D Measurement of the absolute humidity of the air 35 Annex E Measurement of air velocity.45 Annex F Measurement of surface temperature .48 Annex G Measurement of operative temperature49 Annex H Bibliography.51 EN ISO 7726:2001 Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 01:55:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iii 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. Draft International Standards adopted by the 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. International Standard ISO 7726 was prepared by Technical Committee ISO/TC 159, Ergonomics, Subcommittee SC 5, Ergonomics of the physical environment. This second edition cancels and replaces the first edition (ISO 7726:1985), of which it constitutes a technical revision. Annexes A to H of this International Standard are for information only. EN ISO 7726:2001 Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 01:55:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv Introduction This document is one of a series of International Standards intended for use in the study of thermal environments. This series of International Standards deals in particular with the finalization of definitions for the terms to be used in the methods of measurement, testing or interpretation, taking into account standards already in existence or in the process of being drafted; the laying down of specifications relating to the methods for measuring the physical quantities which characterize thermal environments; the selection of one or more methods for interpreting the parameters; the specification of recommended values or limits of exposure for the thermal environments coming within the comfort range and for extreme environments (both hot and cold); the specification of methods for measuring the efficiency of devices or processes for personal or collective protection from heat or cold. Any measuring instrument which achieves the accuracy indicated in this International Standard, or even better improves on, may be used. The description or listing of certain instruments in the annexes can only signify that they are “recommended“, since characteristics of these instruments may vary according to the measuring principle, their construction and the way in which they are used. It is up to users to compare the quality of the instruments available on the market at any given moment and to check that they conform to the specifications contained in this International Standard. EN ISO 7726:2001 Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 01:55:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI LANOITANRETNI DRADNATS © OSI)E(8991:6277 OSI 1 Ergonomics of the thermal environment Instruments for measuring physical quantities 1 Scope This International Standard specifies the minimum characteristics of instruments for measuring physical quantities characterizing an environment as well as the methods for measuring the physical quantities of this environment. It does not aim to define an overall index of comfort or thermal stress but simply to standardize the process of recording information leading to the determination of such indices. Other International Standards give details of the methods making use of the information obtained in accordance with this standard. This International Standard is used as a reference when establishing a) specifications for manufacturers and users of instruments for measuring the physical quantities of the environment; b) a written contract between two parties for the measurement of these quantities. It applies to the influence of hot, moderate, comfortable or cold environments on people. 2 Normative reference The following standard contains provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the edition indicated was valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent edition of the standard indicated below. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 7730:1994, Moderate thermal environments Determination of the PMV and PPD indices and specification of the conditions for thermal comfort. 3 General 3.1 Comfort standard and stress standard The specifications and methods contained in this International Standard have been divided into two classes according to the extent of the thermal annoyance to be assessed. The type C specifications and methods relate to measurements carried out in moderate environments approaching comfort conditions (comfort standard). The type S specifications and methods relate to measurements carried out in environments subject to a greater thermal stress or even environments of extreme thermal stress (heat stress standard). The specifications and methods described for each of these classes have been determined bearing in mind the practical possibilities of in situ measurements and the performances of measuring instruments available at present. EN ISO 7726:2001 1 Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 01:55:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI )E(8991:6277 OSI © OSI 2 3.2 Physical quantities characterizing the environment 3.2.1 Introduction The determination of overall indices of comfort or thermal stress requires knowledge of physical quantities connected with the environment. These quantities can be divided into two categories according to their degree of dependence on the environment. 3.2.2 Basic physical quantities Each of the basic physical quantities characterizes one of the factors of the environment independently of the others. They are often used to define the indices of comfort or thermal stress based on the rationalization of the establishment of the thermal balance of a person placed in a given thermal environment. These quantities are as follows: a) air temperature, expressed in kelvins (Ta) or in degrees Celsius (ta); b) mean radiant temperature expressed in kelvins ( )Tr, or in degrees Celsius ( )tr plane radiant temperature expressed in kelvins (Tpr) or in degrees Celsius (tpr) direct radiation expressed in watts per square metre; c) absolute humidity of the air, expressed by partial vapour pressure (pa) in kilopascals; d) air velocity (Va), expressed in metres per second; e) surface temperature, expressed in kelvins (Ts), or in degrees Celsius (ts). The connections between these quantities and the various gains and losses of heat in relation to the human body are shown in table 1. Table 1 also gives four other quantities which, because they are usually estimated from data tables rather than measured, are not included in the remainder of this International Standard. NOTE The concept of mean radiant temperature allows the study of radiative exchanges between man and his environment. It presupposes that the effects on man of the actual environment which is generally heterogeneous and the virtual environment which is defined as homogeneous are identical. When this hypothesis is not valid, in particular in the case of asymmetric radiation, the radiation exchanges arising from thermally different regions and the extent of their effect on man should also be assessed using the concept of plane radiant temperature. 3.2.3 Derived physical quantities The derived physical quantities characterize a group of factors of the environment, weighted according to the characteristics of the sensors used. They are often used to define an empirical index of comfort or thermal stress without having recourse to a rational method based on estimates of the various forms of heat exchanges between the human body and the thermal environments, and of the resulting thermal balance and physiological strain. Some derived quantities are described in the specific stand
