1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 15758:2010Conservation of CulturalProperty Procedures andinstruments for measuringtemperatures of the air and thesurfaces of objectsBS EN 15758:2010 BRITISH STANDARDNationa
2、l forewordThis British Standard is the UK implementation of EN 15758:2010.The UK participation in its preparation was entrusted to TechnicalCommittee B/560, Conservation of tangible cultural heritage.A list of organizations represented on this committee can beobtained on request to its secretary.Thi
3、s publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. BSI 2010ISBN 978 0 580 60907 7ICS 97.195Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the
4、 authority of theStandards Policy and Strategy Committee on 30 September 2010.Amendments issued since publicationDate Text affectedBS EN 15758:2010EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 15758 September 2010 ICS 97.195 English Version Conservation of Cultural Property - Procedures and i
5、nstruments for measuring temperatures of the air and the surfaces of objects Conservation des biens culturels - Mthodes et instruments de mesure de la temprature de lair et de la surface des objets Erhaltung des kulturellen Erbes - Verfahren und Gerte zur Messung der Temperatur der Luft und der Ober
6、flchen von Gegenstnden This European Standard was approved by CEN on 23 July 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
7、 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 responsib
8、ility 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, Hungar
9、y, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre:
10、 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 15758:2010: EBS EN 15758:2010EN 15758:2010 (E) 2 Contents Page Foreword 3Introduction .41 Scope 52 Normative references 53 Terms and definition
11、s .54 Recommendations relating to measuring methods .84.1 Measurement of air temperature 84.2 Measurement of the effective temperature including radiant contribution .84.2.1 Black-globe thermometer .84.2.2 Measuring temperature with a blackbody strip target .85 Measurement of surface temperature .95
12、.1 General 95.2 Thermometers with contact sensors .95.3 Infrared thermometers (remote temperature sensors) . 105.4 Quasi-contact thermometers . 106 Recommendations relating to variations in space of the thermal quantities 116.1 General . 116.2 Recommendations relating to variations in time of the th
13、ermal quantities . 116.3 Specifications relating to measuring instruments 117 Calibration . 11Annex A (normative) Characteristics of measuring instruments . 13Bibliography . 14BS EN 15758:2010EN 15758:2010 (E) 3 Foreword This document (EN 15758:2010) has been prepared by Technical Committee CEN/TC 3
14、46 “Conservation of Cultural Property”, the secretariat of which is held by UNI. 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 a
15、t the latest by March 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. According to the CEN/CENELEC Internal Regulations, the nat
16、ional 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
17、, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 15758:2010EN 15758:2010 (E) 4 Introduction This standard is intended to assist in providing an acceptable environment for tangible cultural heritage. The temperature of the air and of ob
18、ject surfaces constitute important aspects of that environment. Temperature is one of the factors which can have a profound effect on the preservation of objects. Physical characteristics of materials change as they absorb or release heat. Objects expand and contract as the temperature changes, beco
19、me rigid and brittle if the temperature falls below the glass transition temperature, or are mechanically damaged by the melting and freezing of water. The rates of some important chemical reactions, such as the degradation of cellulose (paper, textiles) increase with rising temperature. Temperature
20、 influences the activity of fungi and insects responsible for the bio-deterioration of organic materials. Temperature may affect some minerals and masonry crystallisation. Temperature also has an important indirect effect: a rise in temperature causes lowering of the relative humidity, which results
21、 in the drying of moisture absorbing materials such as wood, paper or leather. Such drying may lead to shrinkage and embrittlement. When direct radiation from sun, lamps or radiant heaters reaches objects, the consequent temperature rise causes drying even when the relative humidity of the surroundi
22、ng air remains constant. Whatever the air temperature, the water vapour may condense on cold surfaces if their temperature drops below the dew point. The control of levels and variability of temperature contributes to a proper environment for cultural property and thereby reduces the risk of deterio
23、ration. Such control is an important preventive measure which will minimise the need for future conservation interventions. This standard recommends procedures for measuring the temperature of the air and of the surfaces of cultural property in indoor and outdoor environments as well as specifying t
24、he minimum characteristics of instrument for such measurements. Although standards exist for measuring the air or surface temperature in other fields like meteorology, industry or medicine, this standard focuses on the specific requirements of cultural property. One of the main concerns has been the
25、 use of non-contact or remote methods to make possible measuring temperatures of fragile and precious surfaces without any physical contact. However, taking measurements of the object surface, whether using contact or non-contact methods, involves a degree of risk to the object and should not be und
26、ertaken without clear justification nor without consultation with a suitably qualified and experienced conservator, preferably as part of an interdisciplinary team. This document is one of the series of European Standards intended for use in the study of environments of cultural property. Any measur
27、ing system which meets or exceeds the requirements of this European Standard can be used. The description or listing of certain instruments signifies only that they are recommended. It is up to users to analyze the quality of instruments available on the market and verify whether they conform to thi
28、s document. BS EN 15758:2010EN 15758:2010 (E) 5 1 Scope This European Standard recommends the procedures for measuring the temperature of the air and of the surfaces of cultural property in indoor and outdoor environments, as well as specifying the minimum characteristics of instruments for such mea
29、surements. This document contains recommendations for accurate measurements to ensure the safety of objects and it is addressed to any people with the responsibility of the environment, its diagnosis, the conservation or maintenance of buildings, collections, or single object. 2 Normative references
30、 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 7726:2001, Ergonomics of the thermal envi
31、ronment Instruments for measuring physical quantities (ISO 7726:1998) 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 air temperature T temperature read on a thermometer which is exposed to air in a position sheltered from direct solar radiat
32、ion or other energy sources NOTE This is expressed in degrees Celsius (C). 3.2 black-globe thermometer thermometer consisting of a black globe in the centre of which is placed a temperature sensor, and which records the effective air-radiant temperature which results from a thermal balance between a
33、ir temperature, radiation coming from the different heat sources and convective motions 3.3 blackbody strip target low thermal inertia, blackbody target, like a strip of black textile, which assumes an effective air-radiant temperature resulting from a thermal balance between air temperature, radiat
34、ion coming from light, heat sources and convective motions NOTE The surface temperature of the blackbody target is then measured with a quasi-contact or a remote thermometer. 3.4 blackbody body which absorbs all the ultraviolet, visible and infrared radiation impinging on it, i.e. having surface emi
35、ssivity 1 3.5 contact sensor sensor placed in direct physical contact with the surface and devised to reach thermal equilibrium with it BS EN 15758:2010EN 15758:2010 (E) 6 NOTE The sensor may be pressed against the surface or coupled to it with a glue or paste in order to improve the heat exchange a
36、nd achievement of the thermal equilibrium. 3.6 dew-point temperature temperature to which air is cooled at constant pressure and constant water vapour content in order for saturation to occur NOTE This is expressed in degrees Celsius (C). 3.7 emissivity relative power of a surface to emit heat by ra
37、diation expressed as the ratio of the radiant energy emitted by a surface to that emitted by a blackbody at the same temperature NOTE This ranges from 0 to 1. 3.8 infrared thermometer thermometer which permits remote measurements of surface temperature by measuring the flux of infrared radiation emi
38、tted and reflected from the target 3.9 measuring range interval of values that are intended to be measured, or that are potentially measurable, or that have been measured, specified by their upper and lower limits 3.10 probe small device placed in or on the object to make measurements or to protect
39、the sensor NOTE This is usually designed not to influence significantly the result. 3.11 quasi-contact thermometer total radiation thermometer measuring the surface temperature of a target which comprises a sensor located in the focal point of a concave mirror, shielded against the infrared radiatio
40、n from the surrounding sources NOTE The thermometer is placed close to the target but not in contact with it. It measures and converts into the temperature the flux of infrared radiation emitted by the target. 3.12 radiometric temperature temperature measured with an infrared thermometer NOTE This i
41、s expressed in degrees Celsius (C). 3.13 repeatability ability of the measuring instrument to reproduce the same output when successively measuring the same value of the air or the surface under investigation, taken under the same conditions NOTE This is expressed as percent of the range. 3.14 resol
42、ution smallest difference between indications of a displaying device that can be meaningfully distinguished BS EN 15758:2010EN 15758:2010 (E) 7 3.15 response time time interval between the instant when the air, or the surface temperature, is subjected to a specified abrupt change and the instant whe
43、n the response reaches and remains within specified limits around its final steady value NOTE The response time is typically expressed as the time needed to reach 63,2 % of the final value and in this case is called time constant, or 90 % or 95 % of it. The 90 % response time is 2,3 times longer tha
44、n the time constant and the 95 % response time is three times longer. The response time is independent of the span of the output change. 3.16 sensor device that senses either the absolute value or a change in a physical quantity and converts it into a useful input signal for an information-gathering
45、 system 3.17 stability ability of a measuring instrument to keep its metrological characteristics constant over a period of time NOTE Stability should be expressed in terms of variation of temperature response in a year (C/yr). 3.18 surface temperature TS temperature of a given surface of an object
46、NOTE This can be measured with contact thermometers, quasi-contact total radiation thermometers or remote infrared thermometers. The surface temperature is generally different from the air temperature, and varies between different objects and different places on the same object. It is expressed in d
47、egrees Celsius (C). In general, the measured surface temperature is not representative of the whole object. 3.19 target surface surface being in thermal equilibrium with the sensor 3.20 thermometer instrument to measure temperature which comprises a sensor which is placed in thermal equilibrium with
48、 the air (if it measures the air temperature) or the surface, sometimes a probe that contains and protects the sensor, and a system that transforms the input from the sensor into an output expressed in degrees Celsius (C) 3.21 time constant time interval between the instant when the air, or the surf
49、ace temperature, is subjected to a specified abrupt change and the instant when the response reaches 1 1/e = 0,632 (63,2 %) and remains within specified limits around its final steady value NOTE See also response time. 3.22 uncertainty (of measurement) uncertainty is a non-negative parameter characterizing the dispersion of the values attributed to a measured quantity BS EN 15758:2010EN 15758:2010 (E) 8 4 Recommendations relating to measuring methods 4.1 Measurement of air temperature Measurements should only be taken
copyright@ 2008-2019 麦多课文库（www.mydoc123.com）网站版权所有
备案/许可证编号：苏ICP备17064731号-1