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EURAMET Cg-20 v 4.0 Calibration of Temperature and or Humidity Controlled Enclosures | Thermometer | Calibration
EURAMET Cg-20 v 4.0 Calibration of Temperature and or Humidity Controlled Enclosures
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EURAMET Cg-20 v 4.0 Calibration of Temperature and...
Calibration of Temperature and/or
Humidity Enclosures
EURAMET cg-20
Version 4.0 (02/2015)
.0 (02/2015) Calibration of Temperature and / or Humidity Controlled Enclosures Purpose This document has been produced to enhance the equivalence and mutual recognition of calibration results obtained by laboratories performing calibrations of climatic chambers.Calibration Guide EURAMET cg-20 Version 4.
V. . Please register for this purpose at the EURAMET Secretariat. Should the guide be adopted as part of a requirement of any such party. Technical Committee for Thermometry. this document shall prevail.org). No representation is made nor warranty given that this document or the information contained in it will be suitable for any particular purpose. the authors or anyone else involved in the creation of the document be liable for any damages whatsoever arising out of the use of the information contained herein. 2010. Bundesallee 100 D-38116 Braunschweig Germany e-mail: secretariat@euramet. The guide may be used by third parties e.V.This document was developed by the EURAMET e. please contact your national contact person of the EURAMET Technical Committee for Thermometry (see www.. this shall be for that application only and EURAMET secretariat should be informed of any such adoption. The text may not be copied for sale and may not be reproduced other than in full. subject to certain conditions available on application. In no event shall EURAMET. Further information For further information about this document.0 – English version) is held by © EURAMET e. Copyright The copyright of this document (EURAMET cg-20. By applying the recommendations presented in this document laboratories can produce calibration results that can be recognized and accepted throughout Europe. The document has been produced as a means of promoting a consistent approach to good measurement practice leading to and supporting laboratory accreditation.g. ISBN 978-3-942992-36-7 Guidance Publications This document gives guidance on measurement practices in the specified fields of measurements.V. In case of any inconsistency between the terms of the translation and the terms of this document. Version Version Version Version 4. version 3..euramet. Extracts may be taken only with the permission of the EURAMET Secretariat. as a reference only. The approaches taken are not mandatory and are for the guidance of calibration laboratories. The parties using the guide shall indemnify EURAMET accordingly. On request EURAMET may involve third parties in a stakeholder consultations when a review of the guide is planned. National Accreditation Bodies. peer reviewers witnesses to measurements etc.0 March 2011 2 November 2010 1 June 2010 EURAMET e.0 February 2015 3.org phone: +49 531 592 1960 Official language The English language version of this document is the definitive version. The EURAMET Secretariat can give permission to translate this text into other languages.
...................................................................... 6 .................................................................................................................................................... 3 6 Expressing Calibration of Climatic Chambers in the Scope of Calibration ................. 4 Annex A ………......................................... 2 5 Parameter contributing to the Uncertainty ..................................... 3 8 Proficiency Testing .............................................................................................................................0 (02/2015) Calibration of Temperature and /or Humidity Controlled Enclosures Contents 1 Introduction................................................................................................................................................................................................................................................... 3 7 Calibration Certificate ............Calibration Guide EURAMET cg-20 Version 4............................ 1 2 Scope .. 2 4 Calibratability of Climatic Chamber ................................................................................. 5 Appendix A .............................................................................................................................................................................. 4 9 References ...................................................................... 2 3 General Comments........................................................................................
• IEC 60068-3-7 – Environmental testing – Part 3-7: (2001) BS EN 60068 -3-7(2002) Measurements in Temperature Chambers for Tests A and B (with load) • IEC CEI 60068-3-11 – Environmental Testing – Part 3-11: (2007) Calculation of Uncertainty of conditions in Climatic Test Chambers • AFNOR NF X 15-140 – (2002): Mesure de l’humidité de l’air Measurement of Air Humidity Enceintes climatiques et thermostatiques . • IEC 60068-3-6 – Environmental Testing – Part 3-6: (2001) BS EN 60068 -3-6(2002) Confirmation of the Performance of Temperature/Humidity Chambers.Calibration Guide EURAMET cg-20 Version 4. Characterisation and Verification In addition. EURAMET cg-20. It is not the aim to replace or to harmonize the existing standards. the following standards are referred in the standards above : • • IEC 60584-1 Thermocouples – (1995) Part 1 Reference Tables IEC 60751. 2 Scope The purpose of this EURAMET Calibration Guide is to outline the basic technical requirements for those laboratories undertaking the calibration of climatic chambers and to harmonize calibration practices applied in the calibration of climatic chambers to obtain reliable and widely recognized calibration results.0 (02/2015) Calibration of Temperature and /or Humidity Controlled Enclosures 1 Introduction Calibration practices in the laboratories are in many cases based on national or international standards. in particular • IEC 60068-3-5 – Environmental Testing – Part 3-5: (2001) BS EN 60068 -3-5(2002) Confirmation of the Performance of Temperature Chambers.Caractérisation et vérification Climatic and Thermostatic Chambers. which are quite similar in general.0 (02/2015) Page 1 . (2008) Industrial Platinum Resistance Thermometers Class A A summary on the scope of these standards and guidelines is given in Appendix A of this document. The most important standards and technical guidelines are outlined below • • DKD-R 5-7: Calibration of Climatic Chambers. This Calibration Guide is also recommended for the Accreditation Bodies when accrediting laboratories for the calibration of climatic chambers.(2004) English Translation (2007) IEC 60068 series on environmental testing. but show differences in detail and are written for different purposes and different readers. Version 4.
duration of the test. It is strongly recommended that if a chamber is characterised for the first time or modified that it should be calibrated/characterised with both an empty and full load. the list in Section 5 of DKD-R5-7 can be applied). The calibration of autoclaves and similar instruments requires additional specifications. EURAMET cg-20. . study of temporal stability.0 (02/2015) Page 2 . These calibration conditions have to be recorded by the laboratory. (previous stabilization and recording time). air temperature/humidity temporal stability over a representative period of time. This can be done by sending the leaflet given in Annex A of this guideline to the customer.g. the calibration of the indication of a climatic chamber is by far not the best method for documenting the environmental condition during the operation of a climatic chamber.3 General Comments Calibration of a climatic chamber in principle is the determination of the deviation between the indication on the display values of the chamber and the corresponding values measured in the chamber. On the other hand. In some cases this may be an appropriate approach but mostly calibration should be more extensive to meet the requirements of customer’s activities with the chamber. The usual calibration of climatic chambers is restricted to chambers operated at normal pressure. Reference to technical guidelines is recommended. study of spatial distribution of temperature/humidity. it is highly important to clearly state the coverage of the calibration in the corresponding calibration certificate. thermal inertia. To reduce costs. 4 Calibratability of Climatic Chamber A laboratory performing calibrations should specify the criteria for accepting a climatic chamber to be calibrated. The Laboratory and customer have to agree the scope of the calibration requested. which are not described in the above mentioned standards and guidelines and do not form part of this guideline. parameters to be determined (calibration of the set point. etc. Version 4. recovery time.) loading conditions. The use of at least one sensor for temperature and/or humidity in close proximity with the load in the chamber usually will provide much more reliable data than the indication of the climatic chamber. The criteria should be set for the volume of measurement in the chamber. a customer may ask for a calibration at a single measurement point at one location in the chamber (one point calibration). Therefore. Calibration laboratories should inform their customers about this fact. control system of the measurement parameters and technical documentation of the chamber (e. etc can also be specified in the calibration scope of a laboratory. preferably before signing the contract with the customer. The characterisation of other parameters like air temperature/humidity spatial distribution in the specified calibration volume. etc.
g. together with it’s measurement uncertainty. block) in chamber • Influence of the loading of the chamber to the spatial distribution and temporal stability of air temperature and humidity • Influence of ambient conditions • Resolution of indicators The measurement procedures of the calibration laboratories shall describe how the contributions to the uncertainty resulting from these parameters are determined. In some cases a reference to a national or international standard may fulfil this requirement. i. it is necessary to define such parameter and the way it was calculated. 6 Expressing Scope of Calibration The scope declared by a laboratory for calibrations of climatic chambers should state the parameters of the chamber e. in case the calibration was performed in this condition If the results of the sensors are used to determine other parameters.1) caused by different temperatures of the walls of the chamber and the air in the chamber. There should also be a statement stating that the uncertainty has/has not included the radiation effect 7 Calibration Certificate Together with the general requirement of ISO/IEC 17025 with respect to the issue of a calibration certificate.g.4 and NF X 140.Section 7.5 Parameter contributing to the Uncertainty The calibration of a climatic chamber requires at least the determination of the following parameters.diagram) Characteristics of the loading. Version 4. At certain temperatures this can be the largest uncertainty component • Time dependent temperature differences between air. Block) There should be a clear indication (e. EURAMET cg-20.e temperature / humidity spatial distribution or temperature/humidity temporal stability. (ie diameter>4mm). measuring probe(s) and load in the chamber • Sensitivity to temperature changes with probes placed in air or in a buffer(liquid. etc) Details of the specific volume calibrated and distribution of the sensors(i.e. See DKD-R-5-7. which will be considered also in the uncertainty budget: • Air temperature/humidity spatial distribution in the specified calibration volume • Air temperature/humidity temporal stability over a representative period of time • Uncertainties associated with the working standard used for the calibration • Radiation effect associated with the emissivity of the temperature sensor and sensor dimension. a foot note) that the achievable uncertainty for an empty chamber is smaller than for a chamber with a load. the reports related to the calibration of a climatic chamber have to include at a minimum the following information: • • • • Details of the working condition parameters of the chamber used during the Calibration (PID. • • • • • Air temperature in an empty working-volume Air temperature in a loaded working-volume Air humidity in an empty working-volume Air temperature at a single spot in the chamber Specify measurement of probe in air or buffer(Liquid.Section13.0 (02/2015) Page 3 .
i. TEMPMEKO 2004. it is recommended that a well characterized climatic chamber in an independent institute is used for proficiency testing. E. Tegeler. It is also very useful to control the performance of different calibrators within a laboratory by internal comparisons. Proc. The calibration of a climatic chamber is usually done in the premises of the customer.0 (02/2015) Page 4 . 795-800 Attached Documents Annex A: Supplement to the Calibration Certificate for Climatic Chambers Appendix A: Standards and Guidelines EURAMET cg-20.e. Therefore. 2. in: D. Zvizdic (ed. as a field calibrations (except for the initial calibration at the manufacturer).8 Proficiency Testing It is vital for a calibration laboratory to obtain evidence on its competence through proficiency tests and intercomparisons. Version 4. 9 References S. Radiation effects and its consequences on measurements in climatic chambers. pp. vol.). Friederici.
It is valid for the temperature or humidity indication of the climatic chamber in relation to the temperature or relative humidity of the air in the climatic chamber in a defined position or for a defined volume. the influence of this effect increases over proportionally at higher temperatures. Relative humidity is also highly dependent on temperature. considerable deviations (up to several kelvin) from the calibration value can in part be reckoned with. the measuring location(s) or the useful volume. Only if the state of loading.2) can the calibration value be reproduced within the measurement uncertainty stated. Under ambient conditions of measurement other than those stated. Radiation effects When climatic chambers are used in the temperature range above room temperature. are identical and if the thermometer characteristics are similar (ε < 0. the effect is inverse but the impact is considerably smaller and often negligible. Measurement uncertainty The measurement uncertainty stated is valid only if the measurement conditions documented in the specific case are complied with. It is strongly recommended to install temperature and/or humidity sensors in close contact to the load in the chamber. the calibration is valid only for the air temperature and humidity in the empty useful volume of the climatic chamber. Especially if the emissivity or emittance (ε) of the object differs from that of the thermometer. great differences are to be reckoned with. related to the climatic chamber calibrated here. Below room temperature. the air temperature then is higher than the temperature of a thermometer or test object in the useful space. if effective mixing of the useful volume is not ensured or if leaks lead to air being exchanged with the environment. was determined and allowed for in the measurement uncertainty. Relative humidity in the useful volume The distribution of the relative humidity in the useful volume may change considerably if there are water vapour sources or sinks in the useful volume. These sensors usually provide a much more realistic data on the condition in the chamber than the indication of the chamber. Unless expressly stated in the calibration certificate.influence or change the temperature field in the useful volume. the temperature of the thermometer and that of an object in the climatic chamber can differ considerably. According to the law of radiation. the temperature of the walls of many models is lower than that of the air. the object and the thermometer are subjected to comparable → radiation effects. Due to radiation losses. and 3) in qualitative but not in quantitative terms. differences of several kelvin are possible above 150 °C.Annex A: Supplement to the Calibration Certificate for Climatic Chambers Information of the EURAMET Technical Committee ”Thermometry” on the calibration and use of Climatic Chambers General Unless stated otherwise in the calibration certificate. EURAMET cg-20. Depending on the model of the climatic chamber. Version 4.0 (02/2015) Page 5 . a correction for this effect was not applied. size and material of the object are in general not in conformity with the characteristics of the thermometer used for the calibration of the climatic chamber. Also. Object in the useful volume Objects in the useful volume will in general not assume the air temperature prevailing during calibration because 1) the conditions of loading . respectively.unless exactly simulated for the calibration . which has been calibrated. 2) position. The remaining radiation effect of the standard used.
(See Section 7) The approach of this standard to the calibration or characterization of the performance of a chamber is an end user approach. It provides a uniform and reproducible method of confirming that temperature test chambers. • IEC 60068-3-6 – Environmental Testing – Part 3-6: (2001) BS EN 60068 -3-6(2002) Confirmation of the Performance of Temperature/Humidity Chambers. Version 4. This should not be confused with characterizing or calibrating the chamber sensor. concerned with the humidity and temperature of the air in the chamber. The methods used apply both to temperature chambers and combined temperature and humidity chambers. three basic methods for determining temperature and humidity conditions and their associated uncertainties in a climatic test chamber are described.Appendix A: Standards and Guidelines • DKD-R 5-7: Calibration of Climatic Chambers. as experienced by the item under test. • IEC 60068-3-5 – Environmental Testing – Part 3-5: (2001) BS EN 60068 -3-5(2002) Confirmation of the Performance of Temperature Chambers. • IEC CEI 60068-3-11 – Environmental Testing – Part 3-11: (2007) Calculation of Uncertainty of conditions in Climatic Test Chambers This part of IEC 60068 demonstrates how to estimate the uncertainty of steady-state temperature and humidity conditions in temperature and humidity chambers.(2004) English Translation (2009) This guideline lays down minimum requirements for the calibration procedure and for the determination of the measurement uncertainty in the calibration of climatic chambers. This part of the IEC 60068 applies to end users of climatic chambers. at a given set point. specified in climatic test procedures in IEC 60068-2. This standard is intended for users when conducting regular chamber performance monitoring.0 (02/2015) Page 6 . which is a separate matter. This standard is equally applicable to all environmental enclosures. Annex A identifies two sample budgets for both temperature and humidity in relation to their useful volume. EURAMET cg-20. It applies to the calibration of individual measuring locations in climatic chambers. with an empty working space conform to the requirements specified in climatic test procedures of IEC 60068-2. The cases of both calibrating an empty chamber and of measuring conditions in a loaded chamber are considered. This standard is intended for users when conducting regular chamber performance monitoring. including rooms or laboratories. in this case the complete chamber is considered not to be calibrated. This part of IEC 60068 provides a uniform and reproducible method of confirming that temperature and humidity chambers without a load conform to the requirements. specified in climatic test procedures in IEC 60068-2-1 and IEC 60068-2-2. It is applicable to the calibration of climatic chambers for air temperature and relative air humidity or only for air temperature. • IEC 60068-3-7 – Environmental testing – Part 3-7: (2001) BS EN 60068 -3-7(2002) Measurements in Temperature Chambers for Tests A and B (with load) This part of IEC 60068 provides a uniform and reproducible method of confirming that temperature test chambers with a load of either heat-dissipating or non heat-dissipating specimens under conditions which take into account air circulation inside the working space of the chamber conform to the requirements. This standard is intended for users when conducting regular chamber performance monitoring. It applies to chambers both with and without a load with a useful volume. Since this is inextricably linked to the methods of measurement.
1.4. together with the methodology and measures to be used. • Temperature Sensors IEC 60584-1 Thermocouples –Part 1 (1995) IEC 60751 Industrial Platinum Resistance Thermometers Class A IEC 60068-3-5 Section 4. IEC 60068-3-7 Section 4. Version 4. The response time of the overall system should be less than 40 s. In a temperature range range from -200ºC to 200ºC the sensor measurement uncertainty should be in accordance with class A of IEC 60751 EURAMET cg-20. It applies to chambers with or without forced air circulation designed to conduct tests at atmospheric pressure in a thermostatic or climatic environment. normally the type of sensor to be used should be the resistance type in accordance with IEC 60751 or the thermocouple type ( in accordance with IEC 60584-1) The 50% response time in air of the sensor shall be between 10 and 40s.• AFNOR NF X 15-140 – (2002) Mesure de l’humidité de l’air Measurement of Air Humidity Enceintes climatiques et thermostatiques .0 (02/2015) Page 7 . IEC 60068-3-6 Section 4. and AFNOR NF X 15140 state that. Characterisation and Verification The scope of this document is to define and describe the criteria to characterize and verify a chamber.1.Caractérisation et vérification Climatic and Thermostatic Chambers.2. Calculation of uncertainty of each sensor is determined in Appendix D.
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