Interlaboratory Comparison in the field of Temperature, Humidity and Pressure, in the WMO Regional Association VI (MM-ILC-2015-THP)

Transcription

1 Instruments and Observing Methods Report No. 128 WEATHER CLIMATE WATER Interlaboratory Comparison in the field of Temperature, Humidity and Pressure, in the WMO Regional Association VI (MM-ILC-2015-THP) J. Bojkovski, J. Drnovsek, D. Groselj and G. Beges (Slovenia)

2 This publication is available in pdf format, from the WMO Library website: World Meteorological Organization, 2018 The of publication in print, electronic and any other form and in any language is reserved by WMO. Short extracts from WMO publications may be reproduced without authorization, provided that the complete source is clearly indicated. Editorial correspondence and requests to publish, reproduce or translate this publication in part or in whole should be addressed to: Chairperson, Publications Board World Meteorological Organization (WMO) 7 bis, avenue de la Paix Tel.: +41 (0) P.O. Box 2300 Fax: +41 (0) CH-1211 Geneva 2, Switzerland Publications@wmo.int NOTE The designations employed in WMO publications and the presentation of material in this publication do not imply the expression of any opinion whatsoever on the part of WMO concerning the legal status of any country, territory, city or area, or of its authorities, or concerning the delimitation of its frontiers or boundaries. The mention of specific companies or products does not imply that they are endorsed or recommended by WMO in preference to others of a similar nature which are not mentioned or advertised. The findings, interpretations and conclusions expressed in WMO publications with named authors are those of the authors alone and do not necessarily reflect those of WMO or its Members. This publication has been issued without formal editing.

3 FOREWORD Regional Instrument Centres (RICs) and other calibration laboratories within National Meteorological and Hydrological Services (NMHSs) play a major role in performing regular calibrations of measuring instruments. This is essential to ensure traceability of measurements to the International System of Units (SI) and to meet the increasing demand for high-quality measurement data. One effective tool to assure and control the quality of a laboratory s work is participation in an interlaboratory comparisons (ILCs). ILCs are not just a requirement of the ISO/IEC standard but they also help laboratories to demonstrate their competences and to effectively assess the quality of their work. The framework of the MeteoMet2 project Metrology for Meteorology conducted within European Metrology Research Programme (EMRP) of EURAMET, fostered an intensive collaboration of the meteorological and metrology communities. This resulted in an European-wide ILC event, in 2016 that was organized jointly by the RIC Ljubljana and the University of Ljubljana (Slovenia). The ILC involved altogether 18 NMHSs laboratories from WMO Regional Association VI (Europe, hereafter RA VI), including three RICs. The ILC was conducted in the field of the basic meteorological variables: temperature, relative humidity and atmospheric pressure. Almost all of the ILC results were evaluated as being satisfactory, that implies a high level of confidence in the performance of the participants. This is very important for all the laboratories that want to maintain, or apply for, accreditation according to ISO/IEC Results marked as unsatisfactory are also beneficial, because they enable laboratories to identify shortcomings in their operations and give them the opportunity for improvement. The value of this ILC reaches much beyond Europe. The methodology that was developed and applied for conducting this event and the experience gathered are clearly and systematically described in this report and can be easily adapted and applied to other WMO Regional Associations. I wish to express my sincere gratitude and that of the WMO Commission for Instruments and Methods of Observation to the organizers of ILC and authors of this report for their valuable work, which demonstrates the capabilities of many RA VI laboratories and that will hopefully stimulate similar initiative in other parts of the world, thus contributing to the enhanced quality of measurements worldwide. (Prof. B. Calpini) President Commission for Instruments and Methods of Observation

4 REPORT on Interlaboratory Comparison in the field of Temperature, Humidity and Pressure, in the WMO Regional Association VI (MM-ILC-2015-THP) Authors: Jovan Bojkovski 1, Janko Drnovsek 1, Drago Groselj 2, Gaber Beges 1 1 Laboratory of Metrology and Quality, Faculty of Electrical Engineering, University of Ljubljana, Ljubljana, SI- 1000, Slovenia 2 Slovenian Environment Agency, Ljubljana, SI-1000, Slovenia

5 Page: 2 of 93 TABLE OF CONTENTS 1 Introduction Specification of the interlaboratory comparison Participants Time schedule and deadlines Results and their uncertainties The assigned values Pressure results Relative humidity results Temperature results Evaluation Comments and Conclusions Organization and evaluation of the ILC Annex A Proficiency testing protocol Introduction Coordinator/Reference laboratory for pressure, temperature and humidity Data analysis coordinator (accredited PT provider) Participants Time schedule and deadlines Transportation of the equipment Description of the equipment General Environmental conditions Handling Calibration/Test method Start-up and initial inspection Measuring points Reporting of results Measurement uncertainties Appendix Report form Appendix User's Guide for Keysight/Agilent/Hewlett Packard 34420A Appendix User's Guide for Vaisala HMP Appendix User's Guide for Vaisala PTB Appendix Packaging instructions Appendix Instrument Check List from Laboratory...92

6 Page: 3 of 93 1 Introduction The subject of this report is evaluation of the interlaboratory comparison in the field of measurement of temperature, humidity and pressure. The interlaboratory comparison was held within the framework of the MeteoMet 2 project, in the scope of proficiency testing scheme organized by the University of Ljubljana, Faculty of Electrical Engineering, Laboratory of Metrology and Quality (UL-FE/LMK), except pressure part. All the analysis were done in accordance with accredited procedures. Interlaboratory comparison (ILC) serves as a tool for comparison of measurement results carried out by accredited or non-accredited calibration laboratories in the relevant field of measurement. ILC represents very effective means to demonstrate technical competence of the participant and also serves as a technical base for accreditation. Furthermore, it is the most important element for monitoring of quality of measurement results as required by ISO/IEC 17025:2005 standard for laboratories in part 5.9. This ILC was organized by the Regional Instrument Centre in RA VI (Slovenian Environment Agency) and University of Ljubljana, Faculty of Electrical Engineering, Laboratory of Metrology and Quality as accredited proficiency testing provider according to ISO/IEC 17043:2010 by the Dutch Accreditation Council (RvA) under the number R-014. It was recommended that the participants use their standard procedure during the temperature, humidity and pressure calibration and if possible avoid making extra timeconsuming measurements. The proficiency test was carried out in accordance with ISO/IEC 17043:2010. Technical supervision of this interlaboratory comparison was provided by prof. dr. Jovan Bojkovski, as an expert in the field. The reference value were determined by the UL-FE/LMK (except pressure) and three RIC laboratories (Meteo France, Slovakian Hydrometeorological Institute and Slovenian Environment Agency). UL-FE/LMK is Slovenian national standard laboratory for thermodynamic temperature and accredited for calibration in the field of temperature and humidity by the Slovenian Accreditation (LK-002). The MIRS/UL-FE/LMK, as the national laboratory for thermodynamic temperature and humidity, is an associated member of EURAMET (see The test items were sent via registered mail or hand carried. The ILC was performed in accordance with expected time schedule. Delays occurred only in reporting of the results. This report was sent to the participating laboratories in electronic form.

7 Page: 4 of 93 2 Specification of the interlaboratory comparison The purpose of the proficiency test was to compare the results of the participating laboratories during calibration of thermometer, hygrometer and barometer. More details are given in the attached PT protocol. The circulating items were: 1. Keysight/Agilent/Hewlett Packard 34420A digital readout (serial number: US ) + 2 x Pt100 ELPRO (serial numbers and ) loop 1; Keysight/Agilent/Hewlett Packard 34420A digital readout (serial number: MY ) + 2 x Pt100 ELPRO (serial numbers and ) loop 2; calibration range from -30 C to 40 C 2. Vaisala HMP 155 digital hygrometer (serial number K ) loop 1; Vaisala HMP 155 digital hygrometer (serial number K ) loop 2; calibration range from 10 % r.h. to 95 % r.h. at room temperature. 3. Vaisala PTB 220 digital barometer (serial number A ) loop 1; Vaisala PTB 220 digital barometer (serial number W ) loop 2; calibration range from 800 hpa to 1100 hpa. The reported expanded uncertainty of measurement was stated as the standard uncertainty of measurement multiplied by the coverage factor k=2, which for the normal distribution corresponds to a coverage probability of approximately 95 %. The standard uncertainty of measurement was determined in accordance with the publication EA-4/02 and ILAC P14:01/2013 ILAC Policy for Uncertainty in Calibration. It was recommended that the participant used its standard procedures during the calibration and, if possible avoid making extra time-consuming measurements, as described in the proficiency testing protocol. Prior to the calibration, test measurements were performed in order to assess stability of the instruments and indicate any problems, which could occur as the consequence of the transport. From the measurements it has been concluded that all the instruments were stable enough and their short-term stability didn t influence the final results of intercomparison. Calibrations were carried out at an ambient temperature of nominal 23 C. The ambient temperature, relative humidity and pressure also had to be reported. The results were reported electronically. In the report form, the participants were also asked to fill in details about the applied method, equipment and traceability.

8 Page: 5 of 93 3 Participants There were eighteen participants to this proficiency testing and accredited PT provider. The participants agreed that results of this proficiency testing are anonymous. Each laboratory has received a code, which was generated as random number between 10 and 99. The code is sent only to the participating laboratory. In such way, anonymity of the results is guaranteed. Participating laboratory: Meteorological and Hydrological Service (Croatia HR) Contact person: Mr. Krunoslav Premec (Eugen Zobaj) Address: Grič 3 Zip: City: Zagreb Country: Croatia Phone: Fax: krunoslav.premec@cirus.dhz.hr, eugen.zobaj@cirus.dhz.hr Participating laboratory: Department of Meteorology (Cyprus - CY) Contact person: Dr. Kleanthis Nicolaides Address: Nikis Ave 28 Zip: 1086 City: Nicosia Country: Cyprus Phone: Fax: knicolaides@dom.moa.gov.cy Participating laboratory: Estonian Environment Agency (Estonia - EE) (only pressure and temperature - waterproof) Contact person: Mrs. Larissa Hrustnetsova Address: Mustamäe tee 33 Zip: City: Tallinn Country: Estonia Phone: - Fax: - larissa.hrustnetsova@envir.ee Participating laboratory: Finnish Meteorological Institute (Finland - FI) Contact person: Mr. Jussi Haapalainen Address: Erik Palménin aukio 1, PL503, Zip: City: Helsinki Country: Finland Phone: Fax: Jussi.Haapalainen@fmi.fi Participating laboratory: METEO FRANCE (France - FR) Contact person: Ms. Francoise MONTARIOL

9 Page: 6 of 93 Address: bat. Emilie du Chatelet, 42 avenue Coriolis Zip: City: Toulouse cedex1 Country: France Phone: Fax: francoise.montariol@meteo.fr Participating laboratory: Deutscher Wetterdienst (DE1 - Germany) Contact person: Mr. Holger Doerschel Address: Frahmredder 95, Hamburg Zip: D City: Hamburg Country: Germany Phone: +49 (69) Fax: +49 (69) GSM: holger.doerschel@dwd.de Participating laboratory: Deutscher Wetterdienst (DE2 - Germany) Contact person: Mr. Richard Seidl Address: August-Schmauß-Straße 1 Zip: D City: Oberschleissheim Country: Germany Phone: +49 (69) Fax: +49 (69) richard.seidl@dwd.de Participating laboratory: Hungarian Meteorological Service (Hungary - HU) Contact person: Mr. Róbert Mikó Address: Gilice tér 39. Zip: H-1181 City: Budapest Country: Hungary Phone: Fax: miko.r@met.hu Participating laboratory: Met Éireann (Ireland - IE) Contact person: Mrs. Joanne Sheil Address: Glasnevin Hill Zip: D09 Y921 City: Dublin 9 Country: Ireland Phone: Fax: joanne.sheil@met.ie Participating laboratory: State Ltd "Latvian Environment, Geology and Meteorology Centre" (Latvia -LV) (only pressure and relative humidity - *) Contact person: Mrs. Valentina Malecka

10 Page: 7 of 93 Address: Maskavas Str. 165 Zip: LV City: Riga Country: Latvia Phone: Fax: valentina.malecka@lvgmc.lv Participating laboratory: Lithuanian Hydrometeorological Service under the Ministry of Environment (Lithuania - LT) Contact person: Mr. Andrius LAURYNAITIS Address: Rudnios str. 6 Zip: LT City: Vilnius Country: Lithuania Phone: Fax: andrius.laurynaitis@meteo.lt Participating laboratory: KNMI (Nederlands - NL) Contact person: Mr. Hans Verboom Address: Utrechtseweg 297 Zip: 3731 GA City: De Bilt Country: the Netherlands Phone: Fax: hans.verboom@knmi.nl Participating laboratory: Institute of Meteorology and Water Management - National Research Institute (Poland - PL) Contact person: Mr. Jarosław Kanclerz Address: 61 Podleśna Str. Zip: City: Warsaw Country: Poland Phone: Fax: jaroslaw.kanclerz@imgw.pl Participating laboratory: Republic Hydrometeorological Service of Serbia (Serbia - RS) Contact person: Mr. Predrag Petković Address: Kneza Viseslava 66 Zip: City: Beograd Country: Serbia Phone: Fax: predrag.petkovic@hidmet.gov.rs Participating laboratory: Slovenský hydrometeorologický ústav (Slovakia - SK) Contact person: Mr. Jan Danč

11 Page: 8 of 93 Address: Jeseniova 17 Zip: City: Bratislava Country: Slovakia Phone: Fax: jan.danc@shmu.sk Participating laboratory: Slovenian Environmental Agency (Slovenia SI1) Contact person: Mr. Drago Groselj Address: Vojkova 1b Zip: 1000 City: Ljubljana Country: Slovenia Phone: Fax: GSM: drago.groselj@gov.si Participating laboratory: University of Ljubljana, Faculty of Electrical Engineering (Slovenia - SI2) (only temperature and humidity) Contact person: Prof. Dr. Jovan Bojkovski Address: Tržaška cesta 25 Zip: 1000 City: Ljubljana Country: Slovenia Phone: Fax: GSM: jovan.bojkovski@fe.uni-lj.si Participating laboratory: Agencia Estatal de Meteorología (Spain - ES) Contact person: Mr. Fortunato Márquez Address: Paseo de uruguay 2, Madrid Zip: City: Madrid Country: Spain Phone: Fax:- fmarquezo@aemet.es Participating laboratory: TURKISH STATE METEOROLOGICAL SERVICE (Turkey -TR) Contact person: Dr. Zafer Turgay DAĞ Address: Kütükcü Alibey Cad. No:4 Zip: - City: Kalaba-Ankara Country: Turkey Phone: Fax: ztdag@mgm.gov.tr

12 Page: 9 of Time schedule and deadlines The intercomparison was organized in two loops. All participating laboratories had three weeks for calibration including transport to the next laboratory. The transport was planned for each of the participating laboratories, so that the subsequent laboratory receives the equipment no later than on Monday in the first week, in which the calibration is planned to be carried out. More details are given in the attached PT protocol. If a participant anticipated difficulties in keeping the deadlines, the coordinator had to be contacted immediately. In such a case the other participants were contacted as soon as possible and informed about eventual changes. Deadline for reporting the results was 4 weeks after the equipment had the laboratory. It was important that the deadline was met since the results were analyzed continuously by the PT provider. Due to some unexpected delays, especially in formatting of the results and in some cases non-responsivity of participants, the delay of two months occurred. Taking into account complexity of the proficiency test and number of non-accredited laboratories, which participated, this was expected. If there were any problems or doubts regarding the results of the participant laboratory, the accredited PT provider would be contacted immediately. Any suspicion that the equipment was defective or drifted, would lead to return of the equipment to the reference laboratory, which then would make an extra check and take an appropriate action. 4 Results and their uncertainties 4.1 The assigned values As assigned values, measurement values measured by the UL-FE/LMK and three RIC laboratories (Meteo France, Slovakian Hydrometeorological Institute and Slovenian Environment Agency) are used. All four laboratories (three in the case of barometric pressure) participated in both loops. Their values were used for linking two loops. The resulting assigned values were taken as the arithmetic mean value from those measurements. UL-FE/LMK+Meteo France+Slovakian Hydr. Institute + Slovenian Environ. Agency (1) Prior to the proficiency testing, the Coordinator/Reference laboratory (Slovenian Environment Agency) and accredited PT provider (UL-FE/LMK) measured all instruments used in the process plus additional instruments which were kept in case that there could be some problems during the course of PT. For the reporting of results the predefined Excel tables were used. The assigned uncertainties were determined in accordance with the procedure for determination of the uncertainty of the arithmetic mean value of the measurements. They also incorporated the maximum instability of the test items taken as rectangular distribution, as explained in more details in [1-6]. In first loop there were 12 laboratories (11 in case of barometric pressure), in second loop there were 11 laboratories (10 in case of barometric pressure). Four linking laboratories that participated in both loops, took measurements at the beginning of the both loops (SI1, SI2, FR), in the middle of the both loops (SK) and at the end of the both loops (SI1 and SI2). In

13 Page: 10 of 93 such way, we were able to detect any potential short-term drift of the used instruments and to add it to the final uncertainty of the assigned values. Also, any other abnormality in the instrument behaviour was easily detected. If we want to compare results of laboratories which are in the same loop, we can process data like we don t have two loops, but only one. On the other hand, comparing two laboratories which are in different loops, requires additional data processing. As it can be seen from the Figure 1, there are four different routes for comparing any two laboratories to each other [5,6]. 1 LOOP 1 LOOP 2 2 Figure 1: Comparing two laboratories from two different loop via linking laboratories. There are 4 (3 for pressure) linking laboratories, which participated in both loops. The bilateral equivalence D ij represents difference between any two laboratories in any two loops. It can be calculated as:,,, (2) where subscripts i and j identify laboratories and loop(i) gives the loop number of the laboratory no. i. In our case, we have only two loops, so loop in which first laboratory i can be only loop 1 or loop 2. The discrete function B, which is used for linking different loops is defined as:,,,,,,,,, (3), 0 Where:,,1,,,,,,,,,,2,,,,,,,,,, 3,,,,,,,, (4),,4,,,,,,,, R is result of L(i,j,q) of the q th linking laboratory (there are four linking laboratories for temperature and humidity and three for pressure) between loops identified by loop (i) and loop (j) (q is in both loops).

14 Page: 11 of 93 Using this function B we can compare results from both loops, in such way that all the results are normalized and comparable. The correction is defined as:,,,,,,,,,,,,,, 0 (5) It can be estimated that the mean corrections are 0. Thus,,, 0,,,,,, Where u stab,loop(i) is caused by the instability of the instrument in the loop(i). When using the function B the equivalence is weighted by the combined uncertainties of the results of each linking route. By following well-known principles of uncertainty evaluation we derive an equation for the uncertainty of B:,,,,,, (6) Where in case of the same loop, uncertainty of the B is only related to stability of the instrument in that loop, and uncertainty of P, based on the equation (4) is given as:,, 1,,,,,,,, 2,,,,,, (7) r is correlation coefficient. Since linking laboratories used same equipment, same procedure, in short amount of time, there is a correlation between results of the linking laboratory in first loop and in second loop. From point of view of combined uncertainty the worst case approximation for the coefficient was 0,5. This value was used in calculating the final results. The uncertainty contribution of correction term is evaluated in the following way:,,,, (8) The uncertainty of the bilateral equivalence is calculated as:,,,, (9) When using equations (2) and (9) to the results of the linking laboratories, following principle is used: - the laboratories which have participated in the same loop, the results of this loop are used for determining bilateral equivalence. The assigned values in the comparison are defined in order to be able to compare results and uncertainty between laboratories. The calculation of the assigned values is done in accordance with the procedure presented by Cox (Cox, 2002, 2007). In this comparison there was no standard in temperature, humidity or barometric pressure, which was measured by all

15 Page: 12 of 93 participants. As a consequence, absolute value of assigned values were not calculated, but only differences between AV and results of each laboratory. The calculations were carried out using weighted mean of measurement values with their corresponding uncertainties measured by the UL-FE/LMK and three RIC laboratories (Meteo France, Slovakian Hydrometeorological Institute and Slovenian Environment Agency), normalised to the loop of the laboratory under study (x). All four laboratories (three in the case of barometric pressure) participated in both loops. The normalisation was realised using the function B defined by equation (3):,,, (10) 1 1, Where R x is result of the laboratory compared with AV, R i is result of I th laboratory and N is number of the linking laboratories in particular loop. With normalisation we achieved comparability since assigned values of both loops are different and depend on the measuring instrument used in particular loop. Since linking laboratories participated in both loops, they represent a special case. Their results are processed, as average between measured value and assigned value in loop1 and loop2: (11) The uncertainty analysis was done in accordance with the Guide to the Expression of the Uncertainty in Measurement (GUM), [4]. Determined drift of the measured references (PRTs) was added to the total uncertainty as the rectangular distribution. All the uncertainties are at the 95 % confidence level (k=2). The evaluation of the measurement results was made on the basis of E n number: E n x U lab 2 lab x ref U 2 ref where x lab is the participant s result, x ref is the assigned value, U lab is the expanded (k=2) uncertainty of a participant s result and U ref is the expanded (k=2) uncertainty of the reference laboratory s assigned value. Criterion for the performance evaluation is based on statistical determination for E n number, as described in details in ISO/IEC 17043:2010:

16 Page: 13 of 93 E n 1 satisfactory En 1 unsatisfactory In the following tables and graphs, results for pressure, relative humidity and temperature with En values and expanded uncertainty of difference (Rx AV) are presented. In cases when participating laboratory didn t make measurements at certain measurement point, it is represented in grey colour. If the En value is larger than 1 or smaller than -1, the number is coloured in red unsatisfactory.

17 Page: 14 of 93 5 Pressure results Table 1: Results and En values at 800 hpa 800 hpa Rx-AV U(Rx-AV) En Lab. ID 10 0,04 0,05 0,03 0,04 0,07 0,07 0,07 0,07 0,51 0,71 0,52 0, ,03 0,05 0,05 0,04 0,11 0,11 0,11 0,11 0,27 0,46 0,43 0, ,01-0,04-0,03-0,03 0,10 0,10 0,10 0,10-0,11-0,35-0,26-0, ,07 0,03 0,04 0,04 0,16 0,16 0,16 0,16 0,44 0,17 0,25 0, ,01 0,01 0,01 0,01 0,09 0,09 0,09 0,09 0,14 0,10 0,13 0, ,02-0,01-0,02-0,02 0,07 0,07 0,07 0,07-0,22-0,17-0,26-0, ,01-0,01-0,03-0,02 0,14 0,14 0,14 0,14-0,10-0,06-0,22-0, ,06 0,06 0,06 0,06 0,18 0,18 0,18 0,18 0,31 0,33 0,33 0, ,01 0,01 0,01 0,01 0,07 0,08 0,07 0,07 0,16 0,13 0,21 0, ,10 0,11 0,11 0,11 0,08 0,08 0,08 0,08 1,29 1,37 1,34 1, ,08 0,09 0,09 0,09 0,10 0,10 0,10 0,09 0,75 0,89 0,88 0, ,01-0,03-0,03-0,03 0,16 0,16 0,16 0,16-0,07-0,20-0,20-0, ,02 0,03 0,04 0,03 0,07 0,07 0,07 0,07 0,32 0,49 0,54 0,

18 Page: 15 of 93 Table 2: Results and En values at 850 hpa 850 hpa Rx-AV U(Rx-AV) En Lab. ID 10 0,05 0,04 0,04 0,04 0,07 0,07 0,07 0,07 0,75 0,61 0,67 0, ,04 0,05 0,03 0,05 0,11 0,11 0,11 0,11 0,35 0,44 0,30 0, ,02-0,03-0,03-0,03 0,10 0,10 0,10 0,10-0,15-0,33-0,25-0, ,10 0,04 0,05 0,07 0,15 0,15 0,15 0,15 0,70 0,26 0,37 0, ,02 0,00 0,01 0,01 0,12 0,12 0,12 0,12 0,16 0,01 0,12 0, ,03 0,03 0,03 0,03 0,09 0,09 0,09 0,09 0,31 0,32 0,33 0, ,02-0,02-0,02-0,02 0,07 0,07 0,07 0,07-0,31-0,28-0,33-0, ,01 0,01 0,00 0,00 0,13 0,14 0,13 0,14-0,04 0,05 0,03-0, ,06 0,07 0,06 0,07 0,18 0,18 0,18 0,18 0,36 0,37 0,35 0, ,01 0,01 0,01 0,01 0,07 0,08 0,07 0,07 0,15 0,10 0,15 0, ,11 0,10 0,11 0,11 0,09 0,09 0,09 0,09 1,29 1,10 1,27 1, ,08 0,07 0,09 0,09 0,10 0,10 0,10 0,09 0,89 0,70 0,99 0, ,02-0,02-0,01-0,02 0,16 0,15 0,15 0,16-0,09-0,15-0,09-0, ,03 0,04 0,03 0,03 0,07 0,07 0,07 0,07 0,39 0,56 0,40 0,

19 Page: 16 of 93 Table 3: Results and En values at 900 hpa 900 hpa Rx-AV U(Rx-AV) En Rx 10 0,05 0,06 0,04 0,04 0,07 0,07 0,07 0,07 0,70 0,91 0,64 0, ,03 0,05 0,03 0,03 0,12 0,12 0,12 0,12 0,26 0,39 0,23 0, ,02-0,03-0,02-0,02 0,10 0,10 0,10 0,10-0,19-0,33-0,20-0, ,11 0,05 0,06 0,07 0,13 0,13 0,13 0,13 0,85 0,35 0,48 0, ,01 0,02 0,01 0,01 0,12 0,12 0,12 0,12 0,05 0,17 0,10 0, ,03 0,03 0,04 0,03 0,09 0,09 0,09 0,09 0,37 0,35 0,40 0, ,02-0,02-0,03-0,03 0,07 0,07 0,07 0,07-0,25-0,29-0,40-0, ,01 0,00 0,00 0,00 0,13 0,14 0,13 0,14-0,07 0,02-0,01 0, ,06 0,07 0,07 0,06 0,18 0,18 0,18 0,18 0,33 0,40 0,38 0, ,02 0,01 0,01 0,01 0,07 0,08 0,07 0,07 0,33 0,09 0,18 0, ,10 0,10 0,11 0,10 0,09 0,09 0,09 0,09 1,09 1,14 1,20 1, ,05 0,08 0,06 0,06 0,10 0,10 0,09 0,09 0,53 0,86 0,62 0, ,03-0,03-0,03-0,03 0,15 0,15 0,15 0,15-0,21-0,21-0,19-0, ,03 0,04 0,04 0,03 0,07 0,07 0,07 0,07 0,39 0,66 0,53 0, ,03 0,04 0,04 0,04 0,11 0,11 0,11 0,11 0,30 0,35 0,36 0, ,02 0,02 0,03 0,02 0,12 0,12 0,12 0,12 0,17 0,19 0,25 0,20

20 Page: 17 of 93 Table 4: Results and En values at 950 hpa 950 hpa Rx-AV U(Rx-AV) En Lab. ID 10 0,04 0,06 0,04 0,06 0,07 0,07 0,07 0,07 0,65 0,93 0,63 0, ,03 0,06 0,03 0,03 0,12 0,12 0,12 0,12 0,24 0,48 0,23 0, ,02-0,03-0,02-0,03 0,10 0,10 0,10 0,10-0,18-0,34-0,20-0, ,09 0,09 0,07 0,08 0,12 0,12 0,12 0,12 0,71 0,70 0,55 0, ,02 0,05 0,05 0,05 0,12 0,12 0,12 0,12 0,19 0,43 0,42 0, ,04 0,04 0,04 0,04 0,09 0,09 0,09 0,09 0,45 0,39 0,38 0, ,03-0,02-0,03-0,03 0,07 0,07 0,07 0,07-0,44-0,34-0,47-0, ,00 0,00 0,00 0,01 0,13 0,15 0,13 0,14-0,03-0,01-0,02 0, ,07 0,06 0,06 0,07 0,18 0,18 0,18 0,18 0,37 0,32 0,32 0, ,07 0,05 0,05 0,06 0,10 0,10 0,10 0,10 0,65 0,47 0,46 0, ,01 0,01 0,02 0,01 0,07 0,08 0,07 0,07 0,20 0,12 0,27 0, ,10 0,10 0,09 0,10 0,10 0,10 0,10 0,10 1,04 1,06 0,89 1, ,06 0,07 0,07 0,07 0,09 0,09 0,09 0,09 0,64 0,78 0,77 0, ,04-0,05-0,04-0,04 0,15 0,15 0,15 0,15-0,24-0,33-0,28-0, ,03 0,05 0,03 0,04 0,07 0,07 0,07 0,07 0,49 0,75 0,48 0, ,04 0,04 0,03 0,05 0,11 0,11 0,11 0,11 0,31 0,39 0,30 0, ,04 0,03 0,04 0,04 0,12 0,12 0,12 0,12 0,31 0,24 0,32 0,30

21 Page: 18 of 93 Table 5: Results and En values at 1000 hpa 1000 hpa Rx-AV U(Rx-AV) En Lab. ID 10 0,06 0,06 0,04 0,05 0,07 0,07 0,07 0,07 0,86 0,82 0,61 0, ,03 0,05 0,04 0,04 0,12 0,12 0,12 0,12 0,24 0,38 0,35 0, ,03-0,02-0,03-0,03 0,10 0,10 0,10 0,10-0,28-0,24-0,28-0, ,11 0,11 0,11 0,11 0,12 0,12 0,12 0,12 0,86 0,93 0,88 0, ,04 0,05 0,03 0,03 0,13 0,13 0,13 0,13 0,28 0,34 0,24 0, ,05 0,04 0,04 0,04 0,09 0,09 0,09 0,09 0,52 0,38 0,45 0, ,03-0,02-0,02-0,02 0,07 0,07 0,07 0,07-0,38-0,33-0,34-0, ,00 0,00 0,01 0,00 0,13 0,15 0,13 0,14-0,03 0,03 0,09-0, ,07 0,07 0,08 0,08 0,18 0,18 0,18 0,18 0,36 0,40 0,45 0, ,06 0,03 0,02 0,03 0,10 0,10 0,10 0,10 0,54 0,33 0,20 0, ,03 0,03 0,02 0,03 0,07 0,08 0,07 0,07 0,38 0,38 0,33 0, ,10 0,10 0,10 0,10 0,10 0,10 0,10 0,10 1,01 0,98 1,01 1, ,06 0,06 0,08 0,07 0,09 0,09 0,09 0,09 0,62 0,72 0,92 0, ,01 0,00 0,02 0,01 0,16 0,15 0,15 0,15 0,09 0,03 0,12 0, ,03 0,04 0,04 0,04 0,07 0,07 0,07 0,07 0,52 0,60 0,53 0, ,04 0,06 0,05 0,05 0,11 0,11 0,11 0,11 0,35 0,51 0,48 0, ,04 0,04 0,04 0,04 0,12 0,12 0,12 0,12 0,30 0,37 0,34 0,31

22 Page: 19 of 93 Table 6: Results and En values at 1050 hpa 1050 hpa Rx-AV U(Rx-AV) En Lab. ID 10 0,05 0,04 0,04 0,04 0,07 0,07 0,07 0,07 0,77 0,59 0,68 0, ,05 0,04 0,03 0,04 0,12 0,12 0,12 0,12 0,40 0,30 0,26 0, ,03-0,04-0,03-0,04 0,10 0,10 0,10 0,10-0,28-0,43-0,32-0, ,09 0,09 0,10 0,09 0,13 0,13 0,13 0,13 0,72 0,71 0,75 0, ,03 0,06 0,03 0,04 0,13 0,13 0,13 0,13 0,24 0,45 0,27 0, ,03 0,03 0,04 0,03 0,09 0,09 0,09 0,09 0,35 0,33 0,38 0, ,02-0,02-0,02-0,02 0,07 0,07 0,07 0,07-0,33-0,29-0,34-0, ,02 0,00 0,00 0,00 0,14 0,16 0,14 0,14-0,12-0,01 0,03-0, ,06 0,07 0,06 0,07 0,18 0,18 0,18 0,18 0,35 0,38 0,35 0, ,02 0,03 0,02 0,03 0,10 0,10 0,10 0,10 0,23 0,28 0,23 0, ,02 0,02 0,02 0,02 0,07 0,08 0,07 0,07 0,29 0,22 0,24 0, ,09 0,08 0,08 0,09 0,10 0,10 0,10 0,10 0,99 0,83 0,88 0, ,04 0,08 0,06 0,06 0,09 0,09 0,09 0,09 0,49 0,88 0,71 0, ,04-0,05-0,04-0,04 0,16 0,16 0,16 0,15-0,27-0,32-0,24-0, ,04 0,04 0,03 0,03 0,07 0,07 0,07 0,07 0,58 0,57 0,50 0, ,06 0,04 0,05 0,04 0,11 0,11 0,11 0,11 0,49 0,38 0,43 0, ,03 0,03 0,02 0,03 0,12 0,12 0,12 0,12 0,28 0,24 0,20 0,24

23 Page: 20 of 93 Table 7: Results and En values at 1100 hpa 1100 hpa Rx-AV U(Rx-AV) En Lab. ID 10 0,06 0,06 0,05 0,06 0,07 0,07 0,07 0,07 0,91 0,93 0,81 0, ,03 0,04 0,03 0,04 0,13 0,13 0,13 0,13 0,22 0,31 0,24 0, ,02-0,04-0,04-0,03 0,10 0,10 0,10 0,10-0,20-0,38-0,37-0, ,23 0,22 0,22 0,22 0,13 0,13 0,13 0,13 1,76 1,67 1,67 1, ,05 0,06 0,06 0,06 0,13 0,13 0,13 0,13 0,38 0,48 0,49 0, ,02-0,02-0,03-0,02 0,07 0,07 0,07 0,07-0,30-0,24-0,39-0, ,00 0,01-0,01 0,01 0,13 0,14 0,14 0,13-0,01 0,11-0,06 0, ,09 0,08 0,05 0,08 0,18 0,18 0,18 0,18 0,49 0,46 0,28 0, ,02 0,01 0,02 0,01 0,07 0,08 0,07 0,07 0,22 0,15 0,28 0, ,10 0,10 0,10 0,09 0,10 0,11 0,10 0,10 0,99 0,91 0,93 0, ,02-0,02-0,05-0,03 0,16 0,16 0,16 0,15-0,13-0,14-0,34-0, ,05 0,04 0,04 0,04 0,07 0,07 0,07 0,07 0,71 0,65 0,55 0, ,05 0,05 0,05 0,05 0,11 0,11 0,11 0,11 0,42 0,44 0,45 0,43 91

24 Page: 21 of hpa down Lab. ID Table 8: Results and En values at 1050 hpa down Rx-AV U(Rx-AV) En 10 0,05 0,04 0,04 0,05 0,07 0,07 0,07 0,07 0,81 0,66 0,56 0, ,05 0,04 0,03 0,04 0,12 0,12 0,12 0,12 0,40 0,32 0,26 0, ,04-0,05-0,03-0,05 0,11 0,10 0,10 0,10-0,38-0,51-0,33-0, ,08 0,09 0,09 0,08 0,12 0,12 0,12 0,12 0,67 0,70 0,71 0, ,04 0,05 0,05 0,05 0,13 0,13 0,13 0,13 0,34 0,41 0,36 0, ,03 0,03 0,04 0,03 0,09 0,09 0,09 0,09 0,37 0,33 0,40 0, ,02-0,02-0,02-0,02 0,07 0,07 0,07 0,07-0,34-0,31-0,36-0, ,02-0,02 0,00-0,01 0,14 0,16 0,14 0,14-0,14-0,11-0,03-0, ,06 0,06 0,07 0,07 0,18 0,18 0,18 0,18 0,33 0,35 0,36 0, ,02 0,02 0,02 0,02 0,07 0,08 0,07 0,07 0,27 0,27 0,27 0, ,10 0,08 0,09 0,09 0,10 0,10 0,10 0,10 1,05 0,87 0,91 0, ,04 0,07 0,07 0,06 0,09 0,09 0,09 0,09 0,44 0,81 0,73 0, ,04-0,05-0,03-0,04 0,16 0,16 0,16 0,16-0,22-0,32-0,22-0, ,04 0,04 0,03 0,03 0,07 0,07 0,07 0,07 0,58 0,55 0,40 0, ,05 0,04 0,04 0,04 0,11 0,11 0,11 0,11 0,41 0,32 0,35 0,35 91

25 Page: 22 of hpa down Lab. ID Table 9: Results and En values at 1000 hpa down Rx-AV U(Rx-AV) En 10 0,06 0,06 0,05 0,06 0,07 0,07 0,07 0,07 0,97 0,91 0,74 0, ,02 0,04 0,03 0,03 0,12 0,12 0,12 0,12 0,18 0,32 0,22 0, ,02-0,03-0,02-0,03 0,10 0,10 0,10 0,10-0,20-0,33-0,20-0, ,11 0,10 0,10 0,10 0,12 0,12 0,12 0,12 0,89 0,77 0,85 0, ,04 0,04 0,04 0,04 0,13 0,13 0,13 0,13 0,34 0,32 0,30 0, ,04 0,03 0,04 0,04 0,09 0,09 0,09 0,09 0,40 0,37 0,44 0, ,02-0,02-0,02-0,02 0,07 0,07 0,07 0,07-0,30-0,27-0,29-0, ,00 0,01 0,00 0,00 0,13 0,15 0,13 0,14-0,02 0,04 0,00-0, ,08 0,08 0,08 0,08 0,18 0,18 0,18 0,18 0,43 0,42 0,44 0, ,03 0,03 0,02 0,03 0,10 0,10 0,10 0,10 0,27 0,25 0,20 0, ,03 0,03 0,03 0,03 0,07 0,08 0,07 0,07 0,42 0,37 0,35 0, ,11 0,10 0,10 0,10 0,10 0,10 0,10 0,10 1,12 1,02 1,06 1, ,06 0,07 0,07 0,07 0,09 0,09 0,09 0,09 0,65 0,74 0,80 0, ,02 0,01 0,02 0,01 0,16 0,15 0,15 0,15 0,11 0,04 0,12 0, ,04 0,05 0,03 0,04 0,07 0,07 0,07 0,07 0,55 0,68 0,51 0, ,05 0,05 0,05 0,05 0,11 0,11 0,11 0,11 0,48 0,45 0,43 0, ,04 0,04 0,04 0,04 0,12 0,12 0,12 0,12 0,32 0,30 0,34 0,31

26 Page: 23 of hpa down Lab. ID Table 10: Results and En values at 950 hpa down Rx-AV U(Rx-AV) En 10 0,05 0,05 0,05 0,04 0,07 0,07 0,07 0,07 0,74 0,75 0,71 0, ,01 0,03 0,04 0,04 0,12 0,12 0,12 0,12 0,11 0,28 0,34 0, ,03-0,03-0,03-0,03 0,10 0,10 0,10 0,10-0,30-0,33-0,25-0, ,08 0,06 0,06 0,06 0,12 0,12 0,12 0,12 0,69 0,52 0,46 0, ,04 0,04 0,06 0,04 0,12 0,12 0,12 0,12 0,32 0,33 0,47 0, ,04 0,03 0,04 0,03 0,09 0,09 0,09 0,09 0,40 0,28 0,43 0, ,02-0,02-0,01-0,02 0,07 0,07 0,07 0,07-0,23-0,23-0,22-0, ,01 0,00 0,00-0,01 0,13 0,15 0,13 0,14-0,06 0,00 0,01-0, ,06 0,06 0,07 0,06 0,18 0,18 0,18 0,18 0,34 0,33 0,39 0, ,02 0,03 0,02 0,02 0,10 0,10 0,10 0,10 0,21 0,29 0,20 0, ,02 0,03 0,01 0,02 0,07 0,08 0,07 0,07 0,25 0,35 0,20 0, ,10 0,09 0,10 0,09 0,10 0,10 0,10 0,10 1,00 0,94 1,08 0, ,04 0,06 0,06 0,05 0,09 0,09 0,09 0,09 0,47 0,68 0,69 0, ,04-0,05-0,03-0,04 0,15 0,15 0,15 0,15-0,28-0,30-0,22-0, ,03 0,04 0,03 0,03 0,07 0,07 0,07 0,07 0,44 0,57 0,43 0, ,05 0,03 0,04 0,03 0,11 0,11 0,11 0,11 0,44 0,27 0,33 0, ,03 0,03 0,03 0,03 0,12 0,12 0,12 0,12 0,27 0,25 0,26 0,28

27 Page: 24 of hpa down Lab. ID Table 11: Results and En values at 900 hpa down Rx-AV U(Rx-AV) En 10 0,05 0,05 0,04 0,05 0,07 0,07 0,07 0,07 0,72 0,76 0,63 0, ,03 0,04 0,04 0,03 0,12 0,12 0,12 0,12 0,27 0,30 0,30 0, ,02-0,03-0,03-0,03 0,10 0,10 0,10 0,10-0,23-0,31-0,26-0, ,07 0,05 0,06 0,06 0,12 0,12 0,12 0,12 0,60 0,38 0,47 0, ,04 0,04 0,03 0,04 0,12 0,12 0,12 0,12 0,31 0,34 0,26 0, ,04 0,03 0,04 0,04 0,09 0,09 0,09 0,09 0,46 0,34 0,43 0, ,03-0,02-0,03-0,02 0,07 0,07 0,07 0,07-0,44-0,26-0,39-0, ,00 0,01 0,01 0,00 0,13 0,14 0,13 0,14-0,04 0,07 0,04 0, ,07 0,07 0,08 0,07 0,18 0,18 0,18 0,18 0,36 0,38 0,41 0, ,01 0,01 0,01 0,01 0,07 0,08 0,07 0,07 0,18 0,08 0,14 0, ,10 0,10 0,10 0,10 0,09 0,09 0,09 0,09 1,15 1,14 1,09 1, ,06 0,08 0,08 0,07 0,10 0,10 0,09 0,09 0,57 0,84 0,79 0, ,03-0,04-0,02-0,03 0,15 0,15 0,15 0,15-0,20-0,24-0,14-0, ,04 0,04 0,03 0,04 0,07 0,07 0,07 0,07 0,57 0,56 0,42 0, ,06 0,07 0,06 0,06 0,11 0,11 0,11 0,11 0,55 0,58 0,50 0, ,03 0,04 0,04 0,03 0,12 0,12 0,12 0,12 0,21 0,33 0,29 0,26

28 Page: 25 of hpa down Lab. ID Table 12: Results and En values at 850 hpa down Rx-AV U(Rx-AV) En 10 0,04 0,05 0,03 0,04 0,07 0,07 0,07 0,07 0,66 0,68 0,49 0, ,03 0,05 0,04 0,05 0,11 0,11 0,11 0,11 0,28 0,47 0,36 0, ,02-0,02-0,02-0,02 0,10 0,10 0,10 0,10-0,18-0,23-0,22-0, ,06 0,04 0,05 0,05 0,16 0,16 0,16 0,16 0,38 0,25 0,34 0, ,00 0,02 0,00 0,01 0,12 0,12 0,12 0,12 0,03 0,13 0,02 0, ,04 0,02 0,03 0,03 0,09 0,09 0,09 0,09 0,40 0,27 0,33 0, ,02-0,02-0,02-0,02 0,07 0,07 0,07 0,07-0,35-0,24-0,30-0, ,01 0,02 0,01 0,00 0,13 0,14 0,14 0,14 0,07 0,16 0,06 0, ,07 0,06 0,07 0,07 0,18 0,18 0,18 0,18 0,38 0,35 0,37 0, ,01 0,01 0,01 0,01 0,07 0,08 0,07 0,07 0,12 0,09 0,11 0, ,11 0,09 0,12 0,11 0,09 0,09 0,09 0,09 1,25 1,04 1,35 1, ,08 0,09 0,11 0,09 0,10 0,09 0,09 0,09 0,82 0,98 1,14 1, ,01-0,02-0,01-0,01 0,16 0,15 0,15 0,15-0,08-0,15-0,07-0, ,03 0,03 0,03 0,03 0,07 0,07 0,07 0,07 0,52 0,51 0,49 0,

29 Page: 26 of hpa down Lab. ID Table 13: Results and En values at 800 hpa down Rx-AV U(Rx-AV) En 10 0,05 0,05 0,04 0,05 0,07 0,07 0,07 0,07 0,79 0,77 0,54 0, ,04 0,03 0,05 0,05 0,11 0,11 0,11 0,11 0,35 0,25 0,47 0, ,02-0,04-0,03-0,03 0,10 0,10 0,10 0,10-0,18-0,41-0,26-0, ,06 0,03 0,05 0,05 0,16 0,16 0,16 0,16 0,41 0,17 0,29 0, ,03 0,02 0,02 0,02 0,09 0,09 0,09 0,09 0,28 0,23 0,25 0, ,02-0,02-0,02-0,02 0,07 0,07 0,07 0,07-0,34-0,26-0,35-0, ,01-0,01-0,02-0,01 0,14 0,14 0,14 0,14-0,10-0,07-0,15-0, ,07 0,05 0,06 0,06 0,18 0,18 0,18 0,18 0,37 0,27 0,33 0, ,02 0,01 0,02 0,01 0,07 0,08 0,07 0,07 0,20 0,15 0,22 0, ,11 0,08 0,10 0,09 0,08 0,08 0,08 0,08 1,32 1,05 1,24 1, ,07 0,08 0,08 0,08 0,10 0,10 0,10 0,09 0,65 0,78 0,78 0, ,01-0,03-0,01-0,02 0,16 0,16 0,16 0,16-0,05-0,19-0,05-0, ,03 0,04 0,03 0,03 0,07 0,07 0,07 0,07 0,42 0,53 0,40 0,

30 Page: 27 of 93 As an example, the following graphs of the Rx-AV, for, including uncertainties, are presented on following figures. If the difference Rx-AV, including uncertainty does not cover zero value, then absolute value of En is larger than 1 unsatisfactory (example laboratory 53 on Figure 2) Rx AV in hpa Laboratory ID Figure 2: Rx-AV, including uncertainties at 800 hpa

31 Page: 28 of Rx AV in hpa Laboratory ID Figure 3: Rx-AV, including uncertainties at 850 hpa

32 Page: 29 of Rx AV in hpa Laboratory ID Figure 4: Rx-AV, including uncertainties at 900 hpa

33 Page: 30 of Rx AV in hpa Laboratory ID Figure 5: Rx-AV, including uncertainties at 950 hpa

34 Page: 31 of Rx AV in hpa Laboratory ID Figure 6: Rx-AV, including uncertainties at 1000 hpa

35 Page: 32 of Rx AV in hpa Laboratory ID Figure 7: Rx-AV, including uncertainties at 1050 hpa

36 Page: 33 of Rx AV in hpa Laboratory ID Figure 8: Rx-AV, including uncertainties at 1100 hpa

37 Page: 34 of Rx AV in hpa Laboratory ID Figure 9: Rx-AV, including uncertainties at 1050 hpa, decreasing pressure

38 Page: 35 of Rx AV in hpa Laboratory ID Figure 10: Rx-AV, including uncertainties at 1000 hpa, decreasing pressure

39 Page: 36 of Rx AV in hpa Laboratory ID Figure 11: Rx-AV, including uncertainties at 950 hpa, decreasing pressure

40 Page: 37 of Rx AV in hpa Laboratory ID Figure 12: Rx-AV, including uncertainties at 900 hpa, decreasing pressure

41 Page: 38 of Rx AV in hpa Laboratory ID Figure 13: Rx-AV, including uncertainties at 850 hpa, decreasing pressure

42 Page: 39 of Rx AV in hpa Laboratory ID Figure 14: Rx-AV, including uncertainties at 800 hpa, decreasing pressure

43 Page: 40 of d 1000 d 950 d 900 d 850 d 800 d Figure 15: Summary of En values for all pressure calibrations

44 Page: 41 of 93 6 Relative humidity results Table 14: Results and En values at 10 % r.h. 10 %r.h. Lab. ID Rx-AV U(Rx-AV) En 10-0,20 0,93-0, ,32 1,94-0, ,35 1,51-0, ,04 1,15-0, ,13 0,76 0, ,98 1,84-0, ,17 1,58 0, ,05 1,59 0, ,15 1,76-0, ,49 1,74-0, ,15 1,96 0, ,15 2,85-0, ,12 0,93-0, ,15 0,78 0, ,58 1,40-0, ,54 1,66-0,92 Table 15: Results and En values at 20 % r.h. 20 %r.h. Lab. ID Rx-AV U(Rx-AV) En 10-0,46 0,73-0, ,67 1,85-0, ,54 1,32-0, ,14 0,99-1, ,11 0,50-0, ,69 1,80-0, ,02 1,53-0, ,24 1,60-0, ,44 0,99-0, ,16 1,82 0, ,14 2,56-0, ,38 0,73-0, ,03 0,63 0, ,80 1,27-0, ,34 1,56-0,22

45 Page: 42 of 93 Table 16: Results and En values at 35 % r.h. Table 17: Results and En values at 55 % r.h. 35 %r.h. Lab. ID Rx-AV U(Rx-AV) En 10-0,52 0,93-0, ,14 1,94-0, ,40 1,48-0, ,93 1,23-1, ,07 0,79-0, ,12 1,84-0, ,11 1,58 0, ,20 1,56 0, ,10 1,73-0, ,05 1,74 0, ,13 1,23-0, ,30 1,95 0, ,50 2,65-0, ,43 0,93-0, ,01 0,78-0, ,29 1,40-0, ,40 2,18 0, %r.h. Rx-AV U(Rx-AV) En Lab. ID 10-0,55 0,93-0, ,20 1,94-0, ,22 1,49-0, ,73 1,23-2, ,21 0,83-0, ,34 1,84 0, ,14 1,59 0, ,18 1,74 0, ,02 2,01-0, ,32 1,74 0, ,17 1,31 0, ,08 2,03 0, ,12 2,65-0, ,44 0,93-0, ,10 0,79-0, ,35 1,40-0, ,68 2,19 0, ,17 1,66 0,10

46 Page: 43 of 93 Table 18: Results and En values at 75 % r.h. Table 19: Results and En values at 90 % r.h. 75 %r.h. Rx-AV U(Rx-AV) En Lab. ID 10-0,32 1,08-0, ,02 1,94-0, ,11 1,49 0, ,00 1,40-2, ,33 0,88-0, ,04 1,84-0, ,14 1,63 0, ,09 2,19-0, ,21 2,37 0, ,49 1,74 0, ,70 1,49 0, ,01 2,02 0, ,01 2,65 0, ,19 1,08-0, ,08 0,79-0, ,15 1,40-0, ,01 2,19 0, %r.h. Lab. ID Rx-AV U(Rx-AV) En 10 0,05 1,08 0, ,31 1,85-0, ,67 2,07 0, ,32 1,46-2, ,34 0,70-0, ,42 1,80 0, ,24 1,63 0, ,93 1,50-0, ,67 2,56 0, ,98 1,46 0, ,07 1,90 0, ,47 2,75 0, ,20 1,08 0, ,03 0,63-0, ,36 1,27 0, ,17 2,07 0, ,38 2,73 0,87

47 Page: 44 of 93 Table 20: Results and En values at 95 % r.h. 95 %r.h. Lab. ID Rx-AV U(Rx-AV) En 10-0,11 1,23-0, ,69 1,94-0, ,08 2,22 0, ,45 1,40-3, ,72 0,94-0, ,25 1,84 0, ,25 1,67-0, ,82 2,22-0, ,18 2,68 0, ,26 1,74 0, ,12 1,98-0, ,28 2,87 0, ,03 1,23 0, ,16 0,79-0, ,03 1,40 0, ,68 2,22 0,31 96

48 Page: 45 of 93 The following graphs of the Rx-AV, including uncertainties, are preseted on following figures. If the difference Rx-AV, including uncertainty does not cover zero value, then absolute value of En is larger than 1 unsatisfactory (example laboratory 21 on Figure 17) Rx AV in % r.h Laboratory ID Figure 16: Rx-AV, including uncertainties at 10 % r.h.

49 Page: 46 of Rx AV in % r.h Laboratory ID Figure 17: Rx-AV, including uncertainties at 20 % r.h.

50 Page: 47 of Rx AV in % r.h Laboratory ID Figure 18: Rx-AV, including uncertainties at 35 % r.h.

51 Page: 48 of Rx AV in % r.h Laboratory ID Figure 19: Rx-AV, including uncertainties at 55 % r.h.

52 Page: 49 of Rx AV in % r.h Laboratory ID Figure 20: Rx-AV, including uncertainties at 75 % r.h.

53 Page: 50 of Rx AV in % r.h Laboratory ID Figure 21: Rx-AV, including uncertainties at 90 % r.h.

54 Page: 51 of Rx AV in % r.h Laboratory ID Figure 22: Rx-AV, including uncertainties at 95 % r.h.

55 Page: 52 of % r.h. 20 % r.h 35 % r.h. 55 % r.h. 75 % r.h. 90 % r.h. 95 % r.h Figure 23: Summary of En values for all relative humidity calibrations

56 Page: 53 of 93 7 Temperature results Table 21: Results and En values at -30 C Table 22: Results and En values at -20 C -30 C Rx-AV U(Rx-AV) En Lab. ID Pt Pt Pt Pt Pt Pt ,000-0,005 0,071 0,071 0,00-0, ,006-0,003 0,026 0,026-0,24-0, ,006 0,002 0,042 0,041 0,15 0, ,010-0,105 0,190 0,190 0,05-0, ,036-0,016 0,058 0,058-0,63-0, ,000-0,006 0,043 0,043 0,01-0, ,005-0,003 0,016 0,015-0,31-0, ,007 0,002 0,051 0,051 0,14 0, ,063-0,059 0,130 0,130-0,48-0, ,000 0,001 0,071 0,071 0,00 0, ,010-0,005 0,071 0,071-0,15-0, ,001 0,001 0,013 0,013 0,11 0, ,000 0,001 0,014 0,014-0,02 0, ,01 0,00 0,03 0,03-0,27 0, C Rx-AV U(Rx-AV) En Lab. ID Pt Pt Pt Pt Pt Pt ,002 0,006 0,071 0,071 0,03 0, ,002 0,004 0,027 0,026 0,09 0, ,007 0,011 0,042 0,042 0,16 0, ,112-0,084 0,160 0,160 0,70-0, ,016-0,063 0,058 0,058-0,27-1, ,001-0,011 0,043 0,043 0,02-0, ,000 0,002 0,016 0,015 0,02 0, ,009 0,002 0,052 0,052 0,17 0, ,006-0,005 0,029 0,029-0,20-0, ,057 0,013 0,131 0,131-0,44 0, ,003 0,004 0,071 0,071 0,04 0, ,008 0,006 0,071 0,071-0,11 0, ,001 0,000 0,014 0,014 0,05 0, ,001 0,002 0,015 0,015 0,08 0, ,00-0,01 0,03 0,03-0,01-0, ,158-0,094 0,300 0,300-0,53-0,31

57 Page: 54 of 93 Table 23: Results and En values at -10 C Table 24: Results and En values at 0 C -10 C Rx-AV U(Rx-AV) En Lab. ID Pt Pt Pt Pt Pt Pt ,002 0,001 0,071 0,071 0,03 0, ,005 0,004 0,027 0,026 0,21 0, ,006 0,006 0,042 0,042 0,15 0, ,028-0,039 0,121 0,121-0,23-0, ,014 0,003 0,058 0,058 0,25 0, ,006-0,003 0,043 0,043 0,14-0, ,003 0,003 0,016 0,015 0,16 0, ,006 0,002 0,052 0,052 0,12 0, ,008-0,010 0,064 0,063-0,12-0, ,003-0,004 0,029 0,029-0,09-0, ,041 0,002 0,131 0,131-0,31 0, ,003 0,003 0,062 0,061 0,05 0, ,008-0,009 0,071 0,071-0,11-0, ,002-0,001 0,014 0,014-0,12-0, ,003 0,000 0,015 0,015 0,23-0, ,00 0,00 0,03 0,03-0,02 0, ,178-0,079 0,300 0,300-0,59-0,26 0 C Rx-AV U(Rx-AV) En Lab. ID Pt Pt Pt Pt Pt Pt ,006 0,005 0,071 0,071 0,08 0, ,007 0,013 0,027 0,026 0,25 0, ,009 0,008 0,042 0,042 0,20 0, ,046 0,015 0,101 0,101 0,45 0, ,009-0,002 0,058 0,058 0,15-0, ,009 0,000 0,043 0,043 0,20 0, ,004 0,003 0,016 0,015 0,25 0, ,006 0,004 0,052 0,052 0,11 0, ,001-0,007 0,044 0,044-0,03-0, ,001 0,002 0,029 0,029-0,02 0, ,047 0,004 0,131 0,131-0,36 0, ,003 0,002 0,052 0,052 0,05 0, ,004-0,005 0,071 0,081-0,06-0, ,003-0,003 0,014 0,014-0,22-0, ,003 0,010 0,015 0,015 0,17 0, ,00 0,01 0,03 0,03 0,05 0, ,176 0,145 0,300 0,300 0,59 0,48

58 Page: 55 of 93 Table 25: Results and En values at 10 C Table 26: Results and En values at 20 C 10 C Rx-AV U(Rx-AV) En Lab. ID Pt Pt Pt Pt Pt Pt ,004 0,002 0,071 0,071-0,05 0, ,008 0,006 0,027 0,026 0,31 0, ,004 0,011 0,042 0,042 0,10 0, ,066 0,042 0,071 0,071 0,93 0, ,008-0,009 0,058 0,058-0,13-0, ,002 0,004 0,043 0,043 0,04 0, ,002 0,003 0,016 0,015 0,11 0, ,001 0,007 0,052 0,052 0,02 0, ,004 0,003 0,064 0,063 0,07 0, ,004 0,000 0,029 0,029-0,13-0, ,02 0,01 0,15 0,15-0,16 0, ,009-0,003 0,131 0,131-0,07-0, ,004 0,006 0,071 0,071 0,06 0, ,004-0,008 0,071 0,081-0,05-0, ,001-0,002 0,014 0,014-0,05-0, ,003 0,001 0,015 0,015 0,21 0, ,02 0,01 0,03 0,03 0,52 0, ,314-0,268 0,300 0,300-1,05-0,89 20 C Rx-AV U(Rx-AV) En Lab. ID Pt Pt Pt Pt Pt Pt ,000-0,004 0,081 0,081 0,00-0, ,007 0,008 0,027 0,026 0,27 0, ,001 0,006 0,042 0,042 0,01 0, ,080 0,076 0,071 0,071 1,13 1, ,001-0,004 0,058 0,058-0,01-0, ,009 0,011 0,043 0,043 0,21 0, ,002 0,004 0,016 0,015 0,14 0, ,002 0,001 0,052 0,052 0,03 0, ,000-0,004 0,085 0,085-0,01-0, ,001 0,001 0,029 0,029 0,02 0, ,01 0,00 0,13 0,13-0,07-0, ,011-0,015 0,131 0,131-0,09-0, ,003 0,004 0,071 0,071 0,04 0, ,010-0,004 0,071 0,071-0,14-0, ,002-0,003 0,014 0,014-0,16-0, ,005-0,002 0,015 0,015 0,35-0, ,01 0,01 0,03 0,03 0,23 0, ,040 0,106 0,300 0,300 0,13 0,35

59 Page: 56 of 93 Table 27: Results and En values at 30 C Table 28: Results and En values at 40 C 30 C Rx-AV U(Rx-AV) En Lab. ID Pt Pt Pt Pt Pt Pt ,006-0,008 0,081 0,081-0,07-0, ,000 0,004 0,027 0,026 0,01 0, ,005 0,011 0,042 0,042 0,12 0, ,074 0,082 0,160 0,160 0,46 0, ,007-0,017 0,058 0,058-0,12-0, ,002 0,009 0,043 0,043-0,05 0, ,002 0,004 0,016 0,015-0,11 0, ,004 0,010 0,052 0,052 0,08 0, ,003 0,009 0,108 0,108 0,03 0, ,003 0,002 0,029 0,029-0,09 0, ,02-0,01 0,13 0,13-0,12-0, ,013-0,001 0,131 0,131-0,10-0, ,004 0,007 0,062 0,061 0,06 0, ,016-0,018 0,071 0,081-0,22-0, ,002-0,004 0,014 0,014 0,12-0, ,002-0,006 0,015 0,015-0,12-0, ,01 0,02 0,03 0,03 0,36 0, ,034 0,072 0,300 0,300 0,11 0,24 40 C Rx-AV U(Rx-AV) En Lab. ID Pt Pt Pt Pt Pt Pt ,006-0,001 0,081 0,081-0,07-0, ,003 0,005 0,027 0,026 0,11 0, ,001-0,004 0,042 0,042-0,03-0, ,104 0,109 0,200 0,200 0,52 0, ,001-0,011 0,058 0,058-0,02-0, ,006 0,000 0,043 0,043-0,15 0, ,002 0,002 0,016 0,015-0,13 0, ,002 0,000 0,052 0,052 0,03 0, ,004 0,004 0,130 0,130 0,03 0, ,002-0,002 0,029 0,029-0,08-0, ,024-0,017 0,131 0,131-0,19-0, ,001-0,003 0,071 0,071-0,02-0, ,016-0,021 0,071 0,081-0,23-0, ,002-0,001 0,014 0,014 0,15-0, ,002 0,002 0,015 0,015 0,13 0, ,00 0,00 0,03 0,03 0,11 0, ,264 0,319 0,300 0,300 0,88 1,06

60 Page: 57 of 93 The graphs of the Rx-AV, including uncertainties, are presented on following figures. If the difference Rx-AV, including uncertainty does not cover zero value, then absolute value of En is larger than 1 unsatisfactory (example laboratory 21 on Figure 27) Rx AV in C Pt Pt Laboratory ID Figure 24: Rx-AV, including uncertainties at -30 C, both thermometers

61 Page: 58 of Rx AV in C Pt Pt Laboratory ID Figure 25: Rx-AV, including uncertainties at -20 C, both thermometers

62 Page: 59 of Rx AV in C Pt Pt Laboratory ID Figure 26: Rx-AV, including uncertainties at -10 C, both thermometers

63 Page: 60 of Rx AV in C Pt Pt Laboratory ID Figure 27: Rx-AV, including uncertainties at 0 C, both thermometers

64 Page: 61 of Rx AV in C Pt Pt Laboratory ID Figure 28: Rx-AV, including uncertainties at 10 C, both thermometers

65 Page: 62 of Rx AV in C Pt Pt Laboratory ID Figure 29: Rx-AV, including uncertainties at 20 C, both thermometers

66 Page: 63 of Rx AV in C Pt Pt Laboratory ID Figure 30: Rx-AV, including uncertainties at 30 C, both thermometers

67 Page: 64 of Rx AV in C Pt Pt Laboratory ID Figure 31: Rx-AV, including uncertainties at 40 C, both thermometers

68 Page: 65 of Figure 32: Summary of En values for all temperature calibrations for PT 100 1

69 Page: 66 of Figure 33: Summary of En values for all temperature calibrations for PT 100 2

70 Page: 67 of 93 8 Evaluation The evaluation of the measurement results was made on the basis of E n number: E n x U lab 2 lab x ref U 2 ref where x lab is the participant s result, x ref is the assigned value, U lab is the expanded (k=2) uncertainty of a participant s result and U ref is the expanded (k=2) uncertainty of the reference laboratory s assigned value. Criterion for the performance evaluation is based on statistical determination for E n number, as described in details in ISO/IEC 17043:2010: n 1 satisfactory E E n 1 unsatisfactory 9 Comments and Conclusions The interlaboratory comparison had 18 laboratories participating from 17 countries. The equipment used in both loops exhibited stability and uncertainty, which enabled full evaluation of the participating laboratories capabilities. In the field of temperature, out of 270 submitted results, three laboratories (21, 22 and 96) have 5 results with En > 1. The results of other participating laboratories were satisfactory. In the field of relative humidity, out of 117 submitted results, only one laboratory (21) has 5 results with En > 1. It is strongly recommended that this laboratory carefully checks its procedures for any potential systematic error, traceability of its references and uncertainty budget to comply with used equipment and procedures as well as state of the art. The results of other participating laboratories were satisfactory. In the field of pressure, out of 784 submitted results, only laboratories 53 (36 results), 21 (4 results) and 58 (2 results) have results with En > 1. It is strongly recommended that all the laboratories with unsatisfactory results, and especially laboratory 53, carefully check their procedures for any potential systematic error, traceability of their references and their uncertainty budget to comply with used equipment and procedures as well as state of the art. The results of other participating laboratories were satisfactory. For the current state of the art in calibration of any instrument, it is worthwhile to check Bureau International des Poids et Mesures (BIPM) Key Comparison Database (KCDB) Appendix C ( for the calibration and measurement capabilities (CMCs) of the best national metrology laboratories. Some of the uncertainties of the participating laboratories were on the level of the best laboratories. Interlaboratory comparisons in the field of the meteorology are not frequently organized. However, results of this comparison can prove that participating laboratories have a high level of confidence in their calibration and measurement capabilities (CMCs). The CMCs depend on quality of laboratory technical infrastructure (equipment, personnel, facilities, etc.). The evaluation using En number has some disadvantages. In cases when laboratory is not using its best calibration and measurement capabilities in the comparison, the results can be misleading. For example, if the laboratory had input large uncertainty into the interlaboratory comparison, its En number would be rather small. On the other hand, the best results are provided in cases when laboratory has small En number and small uncertainty compared to other laboratories.

71 Page: 68 of 93 Data processing didn t include any analysis for potential same sources of uncertainties. Further investigation could enable more insight in traceability chains and their influence on results of the calibrations. 10 Organization and evaluation of the ILC The organization and evaluation of the ILC was made in accordance with the following documents: ISO/IEC 17043:2010 Conformity assessment General requirements for proficiency testing [1] Cox, M., 2002: The evaluation of key comparison data, Metrologia 39: [2] Cox, M., 2007: The evaluation of key comparison data: determining the largest consistent subset, Metrologia 44: [3] Nielsen,L., 2007: Evaluation of measurement intercomparisons by the method of least squares, Technical Report DFM-99-R39. [4] JCGM 100:2008Evaluation of measurement data Guide to the expression of uncertainty in measurement. [5] Heinenon, M., Report to the CCT on Key Comparison EUROMET.T-K6 (EUROMET Project no. 621). [6] Lorefice, L., et all, EUROMET.M.D-K4 / EUROMET Project 702.

72 Page: 69 of Annex A Proficiency testing protocol World Meteorological Organisation Working Group on Technology Development and Implementation (WG TDI) in RAVI Task Team on Regional Instrument Centre in cooperation with Final ILC protocol INSTRUCTION FOR THE PARTICIPANTS IN THE INTERLABORATORY COMAPRISON Title: Intercomparison in the field of temperature, humidity and pressure MM-ILC-2015-THP Date of approval of the protocol: Items: - Two Pt-100 resistance thermometers ELPRO type /X in combination with Keysight/Agilent/Hewlett Packard 34420A - Capacitive hygrometer Vaisala HMP155 A2GB11A0A1A1A0A - Barometer Vaisala PTB220 ACA2A3A1AB

73 Page: 70 of Introduction Interlaboratory comparison (ILC) serves as a tool for comparison of measurement results carried out by accredited or non-accredited calibration laboratories in the relevant field of measurement. ILC represents very effective means to demonstrate technical competence of the participant and also serves as a technical base for accreditation. Furthermore, it is the most important element for monitoring of quality of measurement results as required by ISO/IEC 17025:2005 standard for laboratories in part 5.9. This ILC will be organized by the Regional Instrument Center in RA VI (Slovenian Environment Agency) and University of Ljubljana, Faculty of Electrical Engineering, Laboratory of Metrology and Quality as accredited proficiency testing provider according to ISO/IEC 17043:2010. It is recommended that the participants use their standard procedure during the temperature, humidity and pressure calibration and if possible avoid making extra time-consuming measurements. The proficiency test is carried out in accordance with ISO/IEC 17043: Coordinator/Reference laboratory for pressure, temperature and humidity The reference value will be determined by the UL-FE/LMK and three RIC laboratories (Meteo France, Slovakian Hydrometeorological Institute and Slovenian Environment Agency). Slovenian Environmental Agency (ARSO) Vojkova 1b, 1000 Ljubljana, Slovenia mag. Drago Groselj Tel.: , Fax.: drago.groselj@gov.si 11.3 Data analysis coordinator (accredited PT provider) University of Ljubljana, Faculty of Electrical Engineering Laboratory of Metrology and Quality (UL/FE-LMK), Tržaška cesta 25, SI-1000 Ljubljana, Slovenia Contact persons in case of technical or administrative questions: Prof. dr. Jovan Bojkovski (Coordinator) Tel.: , Fax.: jovan.bojkovski@fe.uni-lj.si or info@lmk.fe.uni-lj.si 11.4 Participants Following are the participants to this intercomparison. Contact details are as listed alphabetically: Participating laboratory: Meteorological and Hydrological Service (Croatia HR) Contact person: Mr. Krunoslav Premec Address: Grič 3 Zip: City: Zagreb Country: Croatia Phone: Fax:

74 Page: 71 of 93 Participating laboratory: Department of Meteorology (Cyprus - CY) Contact person: Dr. Kleanthis Nicolaides Address: Nikis Ave 28 Zip: 1086 City: Nicosia Country: Cyprus Phone: Fax: knicolaides@dom.moa.gov.cy Participating laboratory: Estonian Environment Agency (Estonia - EE) (only pressure and temperature - waterproof) Contact person: Mrs. Larissa Hrustnetsova Address: Mustamäe tee 33 Zip: City: Tallinn Country: Estonia Phone: - Fax: - larissa.hrustnetsova@envir.ee Participating laboratory: Finnish Meteorological Institute (Finland - FI) Contact person: Mr. Jussi Haapalainen Address: Erik Palménin aukio 1, PL503, Zip: City: Helsinki Country: Finland Phone: Fax: Jussi.Haapalainen@fmi.fi Participating laboratory: METEO FRANCE (France - FR) Contact person: Ms. Francoise MONTARIOL Address: bat. Emilie du Chatelet, 42 avenue Coriolis Zip: City: Toulouse cedex1 Country: France Phone: Fax: francoise.montariol@meteo.fr Participating laboratory: Deutscher Wetterdienst (DE1 - Germany) Contact person: Mr. Holger Doerschel Address: Frahmredder 95, Hamburg Zip: D City: Hamburg Country: Germany Phone: +49 (69) Fax: +49 (69)

75 Page: 72 of 93 GSM: Participating laboratory: Deutscher Wetterdienst (DE2 - Germany) Contact person: Mr. Richard Seidl Address: August-Schmauß-Straße 1 Zip: D City: Oberschleissheim Country: Germany Phone: +49 (69) Fax: +49 (69) richard.seidl@dwd.de Participating laboratory: Hungarian Meteorological Service (Hungary - HU) Contact person: Mr. Róbert Mikó Address: Gilice tér 39. Zip: H-1181 City: Budapest Country: Hungary Phone: Fax: miko.r@met.hu Participating laboratory: Met Éireann (Ireland - IE) Contact person: Mrs. Joanne Sheil Address: Glasnevin Hill Zip: D09 Y921 City: Dublin 9 Country: Ireland Phone: Fax: joanne.sheil@met.ie Participating laboratory: State Ltd "Latvian Environment, Geology and Meteorology Centre" (Latvia -LV) (only pressure and relative humidity - *) Contact person: Mrs. Valentina Malecka Address: Maskavas Str. 165 Zip: LV City: Riga Country: Latvia Phone: Fax: valentina.malecka@lvgmc.lv Participating laboratory: Lithuanian Hydrometeorological Service under the Ministry of Environment (Lithuania - LT) Contact person: Mr. Andrius LAURYNAITIS Address: Rudnios str. 6 Zip: LT City: Vilnius Country: Lithuania Phone:

76 Page: 73 of 93 Fax: andrius.laurynaitis@meteo.lt Participating laboratory: KNMI (Nederlands - NL) Contact person: Mr. Hans Verboom Address: Utrechtseweg 297 Zip: 3731 GA City: De Bilt Country: the Netherlands Phone: Fax: hans.verboom@knmi.nl Participating laboratory: Institute of Meteorology and Water Management - National Research Institute (Poland - PL) Contact person: Mr. Jarosław Kanclerz Address: 61 Podleśna Str. Zip: City: Warsaw Country: Poland Phone: Fax: jaroslaw.kanclerz@imgw.pl Participating laboratory: Republic Hydrometeorological Service of Serbia (Serbia - RS) Contact person: Mr. Predrag Petković Address: Kneza Viseslava 66 Zip: City: Beograd Country: Serbia Phone: Fax: predrag.petkovic@hidmet.gov.rs Participating laboratory: Slovenský hydrometeorologický ústav (Slovakia - SK) Contact person: Mr. Jan Danč Address: Jeseniova 17 Zip: City: Bratislava Country: Slovakia Phone: Fax: jan.danc@shmu.sk Participating laboratory: Slovenian Environmental Agency (Slovenia SI1) Contact person: Mr. Drago Groselj Address: Vojkova 1b Zip: 1000 City: Ljubljana Country: Slovenia Phone: Fax:

77 Page: 74 of 93 GSM: Participating laboratory: University of Ljubljana, Faculty of Electrical Engineering (Slovenia - SI2) (only temperature and humidity) Contact person: Prof. Dr. Jovan Bojkovski Address: Tržaška cesta 25 Zip: 1000 City: Ljubljana Country: Slovenia Phone: Fax: GSM: jovan.bojkovski@fe.uni-lj.si or info@lmk.fe.uni-lj.si Participating laboratory: Agencia Estatal de Meteorología (Spain - ES) Contact person: Mr. Fortunato Márquez Address: Paseo de uruguay 2, Madrid Zip: City: Madrid Country: Spain Phone: Fax:- fmarquezo@aemet.es Participating laboratory: TURKISH STATE METEOROLOGICAL SERVICE (Turkey -TR) Contact person: Dr. Zafer Turgay DAĞ Address: Kütükcü Alibey Cad. No:4 Zip: - City: Kalaba-Ankara Country: Turkey Phone: Fax: ztdag@mgm.gov.tr 11.5 Time schedule and deadlines The intercomparison is organized in two loops. All participating laboratories have three weeks for calibration including transport to the next laboratory. The transport must be planned for each of the participating laboratories, so that the subsequent laboratory receives the equipment no later than on Monday in the first week, in which the calibration is planned to be carried out. If a participant anticipates difficulties in keeping the deadlines, the coordinator must be contacted immediately. In such a case the other participants will be contacted as soon as possible and be informed about eventual changes. Deadline for reporting the results is 4 weeks after the equipment has the laboratory. It is important that the deadline is met since the results are being analyzed continuously by the reference laboratory. If there are any problems or doubt regarding the results of the participant laboratory, the laboratory will be contacted immediately. Any suspicion that the equipment is

78 Page: 75 of 93 defective or drifted, will lead to return of the equipment to the reference laboratory, which then will make an extra check and take an appropriate action. If deadlines are respected, the participants will receive the report of the intercomparison before The first measurement in the first laboratory in schedule is expected to start on Date First loop Second loop SI1, SI2 SI1, SI FR FR IE FI DE DE2 EE SK LV* ES LT HU PL HR SK CY RS (ATA CARNET) NL TR (ATA CARNET) SI1, SI2 SI1, SI2

79 Page: 76 of Transportation of the equipment As soon as the equipment is delivered/sent, the coordinator shall be informed (e.g. by ). The equipment is then unpacked, and an inspection carried out. If the equipment has any visible damage due to transportation, this must be reported to the coordinator before the calibration begins. The equipment can be sent via registered mail (DHL, UPS, etc.) or hand carried (personal transport) to the next laboratory (preferably hand carried). The participating laboratory covers expenses of transportation to the next laboratory. The participating laboratory must ensure that the equipment is covered by insurance from the moment it arrives to the laboratory until it is delivered to the next laboratory (i.e. including the transportation to the next laboratory). Equipment will be accompanied with ATA CARNET forms for non-eu countries (Serbia and Turkey). Please, don t forget to fill them when crossing border between EU country and non- EU country. In case that your country is not signatory of ATA CARNET convention, please perform temporary import/export procedure.

80 Page: 77 of Description of the equipment General Measuring quantity Measuring instrument Temperature Relative humidity Air Pressure Keysight/Agilent Hewlett Packard 34420A digital readout, 2 x Pt100 Capacitive hygrometer Barometer Manufacturer HP, ELPRO Vaisala Vaisala Type 34420A, /X Serial number Loop 1 Loop A: 34420A: US Thermometers MY Thermometers HMP155 PTB220 A2GB11A0A1A1A0A ACA2A3A1AB Loop 1: K Loop 2: K Loop 1: A Loop 2: W Measuring range Output ( ) C ( ) %RH (50 110) kpa Temperature; Digital display, GPIB Voltage (0..1V); Analog output Accuracy 0.05 C at 20 C 1 %RH 15 Pa Uncertainty 0.03 C - - Minimum immersion depth 150 mm - - Pressure; Digital display, GPIB The instrument s owner: UL/FE-LMK. For transportation purposes the measuring instruments will be placed in a protecting case. In a case any of the above-mentioned equipment is missing at the receipt, the coordinator must be contacted.

81 Page: 78 of Environmental conditions Calibration is carried out at an ambient temperature of (20 ± 5) C and relative humidity of (30 60) %. The ambient conditions shall be reported. Barometer stabilization (warm-up) before measurements should have been made according to the common laboratory practice, but at least for 2 hours in the laboratory environment Handling Packing and unpacking Procedure for unpacking is as follows: 1. Inspect the transportation boxes for damage. If the boxes are damaged, the coordinator shall be contacted before continuing. 2. Unpack the equipment and check that all equipment mentioned in the section Description of equipment is present. Please, fill up Instrument Check List Appendix E and send it to jovan.bojkovski@fe.uni-lj.si 3. If any equipment is missing, the coordinator shall be contacted. 4. Inspect the equipment. If any of the equipment shows visible signs of damage, the coordinator shall be contacted. The packing procedure is as follows: 1. Before packing, slowly cool down the equipment (thermometers) to room temperature and clean them with pure alcohol. Clean also other calibrated items if necessary. 2. Check that all equipment mentioned in the section Description of equipment is packed before the equipment is transported to the next participant. For details of packing, please see Appendix D: Packaging instructions Mounting 1. The Pt100 are cleaned before use with pure alcohol. Other instruments should be cleaned only if necessary. 2. Thermometers are carefully placed in the calibration media (bath, climatic chamber). Relative humidity sensor is carefully placed in the calibration media (climatic chamber or humidity generator). Barometer is carefully connected to the barometric pressure system Precautions Pt100 are very sensitive device to vibration and mechanical shock. When not in use, it should be stored in a safe place in the provided transport boxes. Check that the thermometers are completely clean and dry before placing them in the calibration media. Ensure that the thermometers are cooled down and cleaned with pure alcohol before placing them in the transportation box. Don t expose relative humidity sensor to temperatures higher than 25 C and than 15 C. Don t expose barometer to pressures other than barometric! Contact the coordinator in a case of doubt about the above-mentioned precautions.

82 Page: 79 of Calibration/Test method It is recommended that the participants use their standard procedure during temperature, humidity and pressure calibration and avoid making extra time-consuming measurements, if possible. For accredited laboratories it will be advantageous to apply the accredited procedures in preparation for later use of the report in relation with documentation to the accreditation body. Details about the applied procedure have to be stated in the report form Start-up and initial inspection The Keysight/Agilent/Hewlett Packard 34420A instrument can measure 1 Pt 100 at a time. Connect first Pt100 to the Keysight/Agilent/Hewlett Packard 34420A instrument as described on the page 21 of Appendix B. Before start of the measurement, you can setup automatic acquisition of temperature measurement for Keysight/Agilent/Hewlett Packard 34420A instrument using GPIB communication bus. Needed commands are available in the User's Guide (see pages 71 and 72). BE CAREFUL NOT TO CHANGE ANY OF PRESET COEFFICIENTS! After setting up the equipment for the calibration, take the first measurements as follows: 1. For temperature, after the stabilization take the first measurements in the triple point of water, or the ice-point, or in the thermal bath at 0 C. Note the readings of the both thermometers as well as laboratory s reference thermometer and report all these values to the coordinator/reference laboratory, immediately. 2. For relative humidity, after the stabilization take the first measurements at relative humidity of about 55 %. Note the readings of the hygrometer as well as laboratory s reference hygrometer and report all these values to coordinator/reference laboratory, immediately. 3. For atmospheric pressure, after the stabilization take the first measurements at atmospheric pressure of about 950 hpa. Note the readings of the barometer as well as laboratory s reference barometer and report all these values to coordinator/reference laboratory, immediately. Wait for the instruction from the coordinator/reference laboratory Measuring points - Temperature The subject of the ILC is the calibration of two Pt100 in combination with Keysight/Agilent/Hewlett Packard 34420A. The calibration shall be performed in the following measurement points within tolerances ±0.2 C using standard laboratory procedures: C

83 Page: 80 of 93 - Relative humidity: The subject of the ILC is the calibration of the capacitive hygrometer Vaisala HMP155. The calibration shall be made in the following measurement points within tolerances ±3 %r.h. at temperature of 20 C using standard laboratory procedures: %r.h. In case of salt solution calibration other calibration points can be used covering as wide measuring range as possible. - Air pressure: The subject of the ILC is the calibration of the digital barometer Vaisala PTB220 ACA2A3A1AB. The calibration shall start at a minimum calibration point followed by increasing pressure and return steps by decrease of pressure. The calibration shall be made in the following measurement points within tolerances 20 hpa using standard laboratory procedures: hpa Warning: For the purposes of this ILC it is strictly forbidden to make any adjustments to the measuring instrument test item, especially to activate the calibration regime! The only actions permitted are the movement among functions and operations described in the enclosed instruction manual Reporting of results The results are reported electronically in the forwarded Excel spreadsheet. The green fields of the spreadsheet should be filled in, if possible. Send your results only to the data analysis coordinator (jovan.bojkovski@fe.uni-lj.si). The results shall be sent to the coordinator no later than 4 weeks after having finalized the calibration. Electronic reporting by is preferred. As a final result of the ILC send to the coordinator is fulfilled Excel spreadsheet form and Calibration certificate for each quantity. Outline of statistical analysis The assigned values are to be determined as the arithmetic mean of measurements made by the coordinator. Any outliers are detected by Cochran s test and Grubbs test (ISO , and 7.3.4). Information to be returned to participants Final results of the participants will be anonymized (each laboratory with different code). Coding system will be known to the data analysis coordinator (accredited PT

84 Page: 81 of 93 provider) only. The participants will receive summary of all measurements, assigned values and uncertainties of assigned values, and evaluation of the performance. The evaluation of measurement results will be made on the basis of E n number: E n x U lab 2 lab x ref U 2 ref where x lab is the participant s result, x ref is the assigned value, U lab is the expanded (k=2) uncertainty of a participant s result and U ref is the expanded (k=2) uncertainty of the assigned value. The assigned value x ref will be calculated as mean of reference laboratories (RICs and UL/FE- LMK for temperature and humidity; RICs for pressure). The uncertainty of the assigned value U ref will be calculated as uncertainty of mean, with uncertainties of reference laboratories at each calibration point. Criteria for performance evaluation will be based on statistical determination for E n number: E n 1 satisfactory E n 1 unsatisfactory Complaints and appeals Participants may file a complaint or appeal to the data analysis coordinator (UL-FE/LMK, accredited PT provider) in 60 days after they receive the final PT report Measurement uncertainties The measurement results should be stated with their associated uncertainties, the evaluation of uncertainties should be done according to the document EA 4/02 M rev01 (September 2013), ILAC P14:01/2013 ILAC Policy for Uncertainty in Calibration. The interlaboratory comparison should be made according to the best laboratory measurement practice.

85 Page: 82 of Appendix Report form Standard forms for reporting of results and uncertainties for temperature, relative humidity and pressure. The form will be forwarded electronically.

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88 Page: 85 of Appendix User's Guide for Keysight/Agilent/Hewlett Packard 34420A The original User's Guide for Keysight/Agilent/Hewlett Packard 34420A is appended to the ILC Protocol and provided in the ILC kit. Only one thermometer Pt100 can be measured by the Keysight/Agilent/Hewlett Packard 34420A at a time. The ILC kit for temperature measurements consists of: - Keysight/Agilent/Hewlett Packard 34420A - Two identical thermometers Pt100 - Connection unit - Connection cable (34420A connection unit) The Pt100 is connected to the connection unit as shown in the following picture. CONNECTION UNIT The thermometer is connected (4 wire) to the connection unit as follows: The connection unit is connected to the front connection of 34420A. Measured values can be read on display or via GIPB interface bus. When thermometer is connected and 34420A switched on, the temperature of the thermometer can be observed by pressing SHIFT and TEMP key. The display shows temperature of Pt100 in degrees Celsius.

89 Page: 86 of 93 TEMP KEY SHIFT KEY If thermometers reading via GPIS is preferred, following setup for 34420A is used: - Loop 1: GPIB address 27 - Loop 2: GPIB address 20 Command string is <read?> to read value. Warning: For the purposes of this ILC it is strictly forbidden to make any adjustments to the measuring instrument. The only actions permitted are the movement among functions.

90 Page: 87 of Appendix User's Guide for Vaisala HMP155 The original User's Guide for Vaisala HMP155 is appended to the ILC Protocol and provided in the ILC kit. The Vaisala HMP155 type A2GB11A0A1A1A0A is subject for the ILC. The instrument has analog outputs (voltage) for relative humidity and air temperature: - relative humidity: 0 1V corresponds 0 to 100 %r.h. Multiplying by 100 is needed to calculate relative humidity. - air temperature: 0 1V corresponds -40 to +60 C. Multiplying by linear function y=100. x-40 is needed to calculate air temperature. Power supply: although power supply in the range from 7 to 28 VDC may be used, please, use 12V ± 2V in order to minimise power supply impact. Vaisala HMP155 connections and wiring diagram: BLUE RED YELLOW WHITE GREEN PINK GREY BROWN Vcc (12V DC) GND V out1 (relative humidity) V out2 (temperature) A GND (analog ground) Not used Not used Not used Note: Please, remove sensor protection cap before use and return it back after use.

91 Page: 88 of Appendix User's Guide for Vaisala PTB220 The original User's Guide for Vaisala PTB220 is appended to the ILC Protocol and provided in the ILC kit. The Vaisala PTB220 type ACA2A3A1AE is subject for the ILC. The Vaisala PTB220 type ACA2A3A1AE has three pressure transducers ( UL, - UR, LL) and fourth value is average value ( - LR). The pressure connector is barbed fitting 1/8". Please, don t expose barometer to pressures other than barometric! UPPER LEFT - UL UPPER RIGHT - UR LOWER LEFT - LL LOWER RIGHT - LR The barometers are supplied with RS232 communication cable combined with power supply. Please, use supplied power supply for the purpose of ILC. Measured values can be read on display or via RS232C. When barometer is switched on, the pressure can be observed on display. The display shows pressure in hecto Pascal. If reading via RS232C is preferred, following setup for barometers is used: Baud rate 9600 Data bits 7 Parity Even Stop bits 1 Duplex Full duplex Command string is <send> to read value. The read string holds all four pressures. Example: >send <cr> hpa

92 Page: 89 of 93 Warning: For the purposes of this ILC it is strictly forbidden to make any adjustments to the measuring instrument. The only actions permitted are the movement among functions.

93 Page: 90 of Appendix Packaging instructions (LOOP 1) (LOOP 2)

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