SIM.T-K6.4 – INMETRO / INTI Final Report
COMPARISON OF INMETRO AND INTI HUMIDITY STANDARDS
Final Report
Instituto Nacional de Metrologia, Qualidade e Tecnologia (INMETRO) Instituto Nacional de Tecnología Industrial (INTI)
Contents
1. Abstract 2. Introduction 3. Facilities of the Laboratories 4. Transfer Standard 5. Measuring Procedures 6. Results 7. Conclusion 8. References
Appendix 1: CMCs Mass and Related Quantities, INTI AR Appendix 2: CMCs Thermometry, INTI AR Appendix 3: Uncertainty budget for INTI Standard Appendix 4: Uncertainty budget for INMETRO Standard.
SIM.T-K6.4 – INMETRO / INTI Final Report
COMPARISON OF INMETRO AND INTI HUMIDITY STANDARDS
J. D. Brionizio 1, J. G. Skabar 2
1 Instituto Nacional de Metrologia, Qualidade e Tecnologia (INMETRO), Av. Nossa Senhora das Graças, 50 – Xerém – Duque de Caxias – RJ – Brasil – CEP: 25250-020
2 Instituto Nacional de Tecnología Industrial (INTI), Av. General Paz, 5445 – San Martin – Bs. As. – Argentina – B1650WAB
1. Abstract
The aim of this paper is to describe a bilateral comparison carried out by the hygrometry laboratories of the National Metrological Institutes of Brazil and Argentina, INMETRO and INTI, respectively. This comparison was planed and carried out as an informal comparison. But, in view of the lack and the need of humidity comparison reports in the region of the Inter American Metrology System (SIM), we decided to register this comparison as a bilateral key comparison of the regional metrology organization (RMO) , SIM.T-K6.4 – INMETRO / INTI. The comparison was performed in the range from –20 ºC to +60 ºC dew/frost point temperatures at 20 °C steps. This paper presents the calibration methods of the laboratories, the uncertainty analysis and the comparison results. The measurements results of the comparison are also presented in terms of the normalised error (En) as a function of the dew/frost point temperature.
Keywords: Comparison, Humidity, Normalised Error.
2. Introduction
At a meeting held in Paris on October 1999, the directors of the National Metrology Institutes (NMIs) of thirty-eight Member States of the Bureau International des Poids et Mesures (BIPM) and representatives of two international organizations signed a Mutual Recognition Arrangement (MRA) for national measurement standards and for calibration and measurement certificates issued by NMIs. A number of other institutes have signed since then. The MRA gives users reliable information on the comparability of national metrology services and provides the technical basis for arrangements negotiated for international trade, commerce and regulatory affairs [1]. Hence, comparison of reference standards between NMIs became very important.
In order to respond to the increasing needs for humidity sensors calibration in Brazil, the Thermal Metrology Division of the National Institute of Metrology, Quality and Technology (INMETRO) established a hygrometry laboratory which started to render calibration services in 1998. The laboratory’s calibration system is composed of several equipments and instruments to cover the range from –75 ºC to +75 ºC of dew/frost point temperatures. The humidity standard system had already been employed in other bilateral comparisons to demonstrate its equivalence to humidity standards of other countries [2]. Also, the standard instruments are periodically compared to each other in order to assure the quality of the calibration and test results [3].
For several years INTI has carried out activities in order to meet the needs of humidity measurements in Argentina. Before the year 2006, INTI Física y Metrología rendered calibration services of humidity sensors in a reduced range. At that moment, INTI’s humidity standard was an aspirate psychrometer traceable to Physikalisch - Technische Bundesanstalt (PTB) in relative humidity.
In the year 2006 a primary humidity generator was acquired. This is a commercial equipment of the brand Thunder Scientific model 2500 LT. This generator operates on the principle of the two - pressures method [4] and today it is INTI’s humidity standard. The traceability to international system of units (SI) is achieved by calibration of pressure and temperature sensors at INTI labs without need of external calibrations. INTI’s humidity lab covers the range between 10 %rh to 95 %rh at temperatures between –10 ºC to 70 ºC (approx.: –35 ºC to 65 ºC in dew point temperature). In the last five years, the generator has been checked with a capacitive humidity sensor traceable to an accredited laboratory. It is the first experience in a humidity comparison at INTI.
The aim of this work is to describe a bilateral comparison that was carried out by the hygrometry laboratories of INMETRO and INTI, and was piloted by INMETRO. The protocol applied was discussed previously by the authors. The protocol used in earlier comparisons by INMETRO with others countries [2] was used as base. The comparison of the humidity standards was performed in the range from –20 ºC to +60 ºC of dew/frost point temperatures at 20 °C steps. A total of five dew/frost point temperatures were used for the comparison.
As transfer standard, a chilled-mirror hygrometer (CMH) was used. CMHs, considered as one of the most accurate and reliable methods of measuring dew/frost point temperatures, have been widely used as reference standards in calibration laboratories and as transfer standards in comparisons of humidity national standards.
The measurements started at INMETRO by comparison of the transfer standard readings with those indicated by the standards CMHs. The air samples were generated by a working humidity generator equipped with a climatic chamber where the sensor of the transfer standard was positioned. The transfer standard was then hand-carried to INTI, where it was also calibrated inside the climatic chamber of the primary humidity generator. After returning to INMETRO’s laboratory, measurements were repeated in order to check the CMH stability and to obtain a larger data sample since the beginning of the calibration.
This paper presents the calibration methods of both laboratories, the uncertainty analysis and the comparison results. The measurements results of the comparison are presented in terms of the normalised error (En) as a function of the dew/frost point temperature.
3. Facilities of the Laboratories
The humidity laboratory of INMETRO has four standard CMHs of which two are calibrated abroad, they are: i) a Michell S4000, identified as PR 001, traceable to the National Physical Laboratory (NPL, UK) in the dew/frost point temperature range from –75 ºC to +20 ºC; and ii) a MBW 373, identified as PR 002, traceable to the Centre Technique des Industries Aérauliques et Thermiques (CETIAT, France) in the dew/frost point temperature range from –40 ºC to +75 ºC.
For the generation of air samples, the humidity laboratory of INMETRO uses three commercial humidity generators: i) a Michell divided-flow generator, model DG-4, which works in the dew/frost point temperature range from –75 ºC to +20 ºC. In this equipment, dried gas is divided into two streams of which one passes through a water saturator and is mixed with the other stream to produce a certain gas sample. Dew/frost point temperatures can be selected via a front panel keypad, through factory pre-set values, or by manually mixing the wet and dry gases by means of metering valves mounted on its front panel; and ii) two Weiss Technik climatic chambers, models SB2-300 and WK3-340/40, that have a relative humidity operating range from 10 %rh to 98 %rh in the range from 10 ºC to 95 ºC.
The humidity standard of INTI is a two pressure primary humidity generator. It is a commercial equipment, Thunder Scientific 2500 LT, serial number 0607577 humidity range is 10 %rh to 95 %rh and temperature range is -10 ºC to 70 ºC. This is approximately -35 ºC to 65 ºC in dew point temperature. The two pressures principle for generating humidity air samples is a process that involves, first the saturation of an air sample at one pressure and then the decompression of this sample to produce an air sample with less humidity [5, 6].
Figure 1 – Principle of INTI’s Humidity Standard
The humidity value of the generated air sample is determined by the measurements of saturator pressure, sample chamber pressure, saturator temperature and sample chamber temperature using equation (1) or (2) [5, 6, 7].
RH (%) =
f (Ps , ts ) ⋅ ew (ts ) ⋅ Pc f (Pc , tc ) ⋅ ew (tc ) ⋅ Ps
⋅100
(1)
f (Pc , tdew )⋅ ew (tdew ) =
f
(Ps
,
Ts )⋅
Ps
ew
(Ts
)
⋅
Pc
(2)
Where, RH(%) – Relative humidity; tdew – Dew point temperature; ew (t) – Vapor pressure; f (P, t) – Enhancement factor; Px – Pressure (x = s: saturator, c: chamber);
tx – Pressure (x = s: saturator, c: chamber).
The Thunder Scientific 2500 LT is commanded via a front panel or via RS232 port by software 2500 ControlLog for control and data acquisition. In this generator it is only possible to control the saturator pressure and the saturator temperature. The sample chamber is at atmospheric pressure and at the same temperature as the saturator. The value of the relative humidity or dew point temperature is showed in the front panel or via software. The pressure and temperature measurements are traceable to SI. Both sensors are calibrated at INTI with traceability at the temperature and pressure national standard, see Appendix 1: CMCs Mass and Related Quantities and Appendix 2: CMCs Thermometry of INTI.
The INTI humidity lab also has two instruments as secondary standards and a climatic chamber: a Vaisala HM70 with a probe HMP77B capacitive hygrometer, an Almemo FNA846 aspirate psychrometer, and a Weiss SB1/300/40 climatic chamber. These are used in the calibration services and tests.
4. Transfer Standard
As transfer standard, a Michell Optidew Vision CMH, serial number 118931, property of INMETRO, which can operate in the range from –60 ºC to +90 ºC of dew/frost point temperature, was used for the comparison. The hygrometer control unit is separated from the dew point sensor head. The latter can thus be mounted in several ways to suit the purpose. An application software allows its control and the data acquisition. In order to prevent any loss of measurement accuracy due to mirror contamination, the hygrometer uses an automatic compensation system based on a self-learning prediction algorithm which adjusts the operating conditions in order to achieve optimal performance at all times. The decision to use this instrument as transfer standard was based on the following considerations: (i) we found it more interesting to use this one than INTI´s RH sensor (Vaisala); (ii) it was used before for this same purpose with satisfactory results [2] and (iii) it is a dew-point hygrometer that has moderate accuracy, simple operation and easy transportation. It is necessary to say that registering this comparison was not among our initial objectives. It was planed as a first approach.
5. Measuring Procedures
At both institutes, for all the five comparison points, four measurement runs were carried out in order to quantify the effect of any irreproducibility of the transfer standard. For each run, the condensate was cleared and re-formed and ten measurements were acquired at intervals of 1 min.
In order to avoid any complication in the measurement due to the phase change between water and ice, the nominal value of 0 ºC was changed to +1 °C.
Measurements at INMETRO
For this bilateral comparison, the air samples generated by one of the chambers (WK3-340/40) and the reference values indicated by the standard hygrometer PR 002 were used. However, several times, the standard hygrometer PR 001 and another hygrometer (PR 040), which was calibrated by the manufacturer, whose lab is accredited in its country, were used in parallel to PR 002. Some points were also repeated using hygrometers PR 001 and/or PR 040. In every case, the results found using hygrometers PR 001 and/or PR 040 were equivalent to the results obtained using hygrometer PR 002.
For all the comparison points, the transfer standard sensor was positioned near the centre of the climatic chamber. Air samples from the climatic chamber were brought to the measurement head of the standard hygrometer PR 002 by means of its internal diaphragm pump, or by an external suction pump, and a heated hose. The hose inlet was placed near the transfer standard sensor head. The gas flow rate in the standard hygrometer was set to approximately 0.5 l/min. For the dew/frost points of – 20 ºC and 1 ºC, the hose, the internal tubing and the measurement head of the standard hygrometer PR 002 were kept at room temperature (21 ºC). For the dew points of 20 ºC, 40 ºC and 60 ºC, in order to prevent any condensation, the devices were heated about 20 ºC above the actual dew point temperature.
The frost point temperature of –20 ºC was repeated with the transfer standard sensor head outside the climatic chamber housed into a stainless-steel sampling device. Stainless-steel tubes were used for connecting the device to the chamber. The gas flow rate was set to approximately 1.0 l/min. The system operated in the open circuit mode. The transfer standard sensor head was cooled to –3 ºC by means of a water/ethanol mixture supplied by a thermostatic bath. Before performing the measurements, the acquisition system was purged for about 4 hours. The results found with this measurement procedure were equivalent to the ones obtained when the transfer standard sensor head was inserted directly in the centre of the chamber, without cooling and pumping.
Figure 2 – Transfer Standard Sensor Connected at INMETRO Climatic Chamber and Cooled at –3 ºC
Measurements at INTI
The measurements were performed in the chamber of the generator. All points were measured with a sensor transfer placed in the center of the chamber and a chamber temperature sensor placed beside it. Several positions of the sensor transfer were tested in order to avoid the effects of the high flux of air over the mirror. The air flux of generator was tested at 10 l/min, 15 l/min and 20 l/min, and no differences were found. The air flux wasn't measured at the instrument; these were different operating conditions of the generator. In all cases the saturator temperature, that is approximately the same as the chamber temperature, was set at 5 ºC or more over the dew point temperature of the generated sample to avoid any kind of condensation. Only the raw measurements of saturator pressure, chamber pressure and saturator temperature were used. The reference values of dew point temperature were calculated with a home made software. This software was validated satisfactorily with Control Log and other commercial softwares. The uncertainty of dew point reference temperature was calculated by classical uncertainty propagation and checked by simulation of distributions [6, 7, 8]
Figure 3 – Transfer Standard Sensor Inside of the Chamber of INTI Primary Generator
6. Results
For each nominal comparison point, the mean values of the reference standard (RS) and transfer standard (TS) readings were calculated for each run. Table 1 shows these values for INMETRO and INTI.
INMETRO
-20
RS -19.91 -19.80 -19.84 -19.91 TS -19.60 -19.32 -19.40 -19.42
0
RS +0.96 +0.96 +0.89 +0.93 TS +1.09 +1.08 +1.03 +1.08
+20
RS +19.97 +19.98 +19.86 +20.01 TS +20.12 +20.15 +20.04 +20.20
+40
RS +40.17 +40.25 +40.21 +40.17 TS +40.36 +40.43 +40.39 +40.33
+60
RS +60.16 +60.21 +60.00 +59.99 TS +60.32 +60.38 +60.21 +60.19
INTI
-20
RS -19.90 -19.90 -19.91 -19.89 TS -19.49 -19.49 -19.49 -19.49
0
RS +1.19 +1.19 +1.18 +1.18 TS +1.20 +1.20 +1.29 +1.30
+20
RS +19.92 +19.92 +19.92 +19.89 TS +19.89 +19.88 +19.68 +19.63
+40
RS +40.02 +40.02 +40.02 +40.01 TS +40.18 +40.15 +40.13 +40.12
+60
RS +59.95 +59.95 +59.95 +59.95 TS +60.24 +60.21 +60.21 +60.18
Table 1 – Mean Values of the Measurements for the 4 Runs (in °C)
The average difference (D) of the four runs, performed at each laboratory, was used for the comparison. Table 2: shows the overall mean values (mean of the mean values of the four runs) and the mean differences for both institutes.
T
INMETRO
INTI
RS TS D RS TS D
-20 -19.87 -19.44 -0.43 -19.90 -19.49 -0.41 0 +0.94 +1.07 -0.13 +1.19 +1.25 -0.06 20 +19.95 +20.13 -0.17 +19.91 +19.77 +0.14
40 +40.20 +40.38 -0.18 +40.02 +40.15 -0.13
60 +60.09 +60.28 -0.19 +59.95 +60.21 -0.26
Table 2 – Mean Values of Both Runs and Differences (in °C)
Based on the Guide to the Expression of Uncertainty in Measurement [9], the laboratories calculated the measurement uncertainty at each point. The combined standard uncertainty (uc) was calculated using equation (3) below:
4
∑ uc =
ui2
(3)
i=1
Where, u1 – Standard uncertainty associated with the reference standard (based on a normal distribution); u2 – Standard uncertainty due to the resolution of the transfer standard (based on a rectangular distribution); u3 – Standard uncertainty associated with transfer standard repeatability (based on a normal distribution); u4 – Standard uncertainty associated with transfer standard reproducibility (based on a normal distribution).
At INTI, the reference standard uncertainty is derived from the uncertainty of the primary generator. See Appendix 3: Uncertainty budget for INTI Standard. At INMETRO, the reference standard uncertainty combines the calibration uncertainty of the reference hygrometer, its resolution, the drift between successive calibrations and an uncertainty contribution associated with the polynomial correction. See Appendix 4: Uncertainty budget for INMETRO Standard.
At both institutes, for the transfer standard, the uncertainty associated with repeatability was estimated as the average of the mean standard deviations of the four runs, and the uncertainty associated with reproducibility was estimated as the standard deviation of the four differences. In the case of INMETRO, the reproducibility of transfer standard takes into consideration measurements realized before and after measurements realized in INTI. Therefore, the drift of transfer standard is being
considered within the reproducibility of transfer standard. We mean the reproducibility of transfer standard takes into consideration the drift of transfer standard.Table 3: shows the uncertainty sources and the combined uncertainties for both institutes.
INMETRO
T
u1
u2
u3
u4
uc
-20 0.063 0.029 0.007 0.081 0.107
0 0.048 0.029 0.013 0.013 0.059
+20 0.048 0.029 0.012 0.018 0.060
+40 0.048 0.029 0.014 0.011 0.059
+60 0.048 0.029 0.012 0.025 0.062
INTI
T
u1
u2
u3
u4
uc
-20 0.105 0.029 0.04 0.008 0.116
0 0.051 0.029 0.03 0.059 0.088
+20 0.054 0.029 0.03 0.125 0.142
+40 0.055 0.029 0.03 0.024 0.073
+60 0.053 0.029 0.03 0.021 0.071
Table 3 – Uncertainty Contributions and Combined Standard Uncertainty (in °C)
The measurement expanded uncertainty (U) was calculated by multiplying the combined standard uncertainty (uc) by a coverage factor k=2, which corresponds to a confidence interval of approximately 95%.
Table 4 shows the uncertainties at the comparison points for each participating laboratory.
INMETRO
T
uc
k
U
INTI
uc
k
U
-20 0.107 2.0 0.21 0.116 2.0 0.23
0 0.059 2.0 0.12 0.088 2.0 0.18
+20 0.060 2.0 0.12 0.142 2.0 0.28
+40 0.059 2.0 0.12 0.073 2.0 0.15
+60 0.062 2.0 0.12 0.071 2.0 0.14
Table 4 – Measurement Uncertainty (in °C)
Figure 4 compares the differences found at INMETRO and at INTI. The vertical error bar associated with each measurement point represents the expanded uncertainty listed in the above Table 4.
Figure 4 – Measurement Differences and associated Expanded Uncertainty
The compatibility of the measurements was analysed by means of the normalised error (En). A comparison measurement is satisfactory when its En is equal or lower than one [10]. En numbers were calculated according to the equation (4) below.
En =
DINMETRO − DINTI
(4)
( ) ( ) U + U 2 INMETRO
2 INTI
Where, DINMETRO – Difference found for INMETRO measurements; DINTI – Difference found for INTI measurements; UINMETRO – Expanded uncertainty calculated at INMETRO; UINTI – Expanded uncertainty calculated at INTI.
Table 5 below presents the En numbers of all comparison points for INMETRO and INTI.
T
DINMETRO - DINTI UINMETRO UINTI
( ) ( ) U + U 2 INMETRO
2 INTI
En
-20
-0.02
0.21 0.23
0.31
0.08
0
-0.07
0.12 0.18
+20
-0.32
0.12 0.28
0.22
0.34
0.30
1.02
+40
-0.05
0.12 0.15
+60
+0.07
0.12 0.14
0.19
0.26
0.18
0.39
Table 5 – En Numbers
7. Conclusion
A bilateral comparison of the humidity standards of the hygrometry labs of INMETRO and INTI in the dew/frost point temperature range from –20 ºC to +60 ºC was presented. The calibration methods, the uncertainty analysis and the comparison results were also discussed.
The highest difference among the differences found by the laboratories was observed in the comparison dew point temperature of 20 ºC. For this point, the En number was slightly higher than one. The laboratories have discussed about the reason for this difference, but no objective evidence was found.
The measurement of the 20 ºC dew point temperature carried out at INTI shows low repeatability and the difference does not follow the tendencies of the other measured points. During the data acquisition process, the measurements and control parameters of the generator did not show any anomalies. The transfer standard is also a well-known instrument which has been exhaustively calibrated in the last years. So, the incompatibility in this point does not seem to have anything to do with the generator or the transfer standard. An operational problem seems to be the most probable cause. Although several and careful cleaning processes were performed, the possibility of some occasional contamination of the sensor mirror surface cannot be totally dismissed. The possibility that the air speed and its profile within the chamber have affected the condensate formation on the sensor mirror surface cannot be dismissed either.
However, as reported in Table 5, the normalised errors show that the En numbers are lower than one for the other comparison points. So, it can be concluded that, except for the 20 ºC dew point temperature, INMETRO and INTI measurements agreed to within their expanded uncertainties with a confidence level of approximately 95%.
8. References
[1] Bureau International des Poids et Mesures (BIPM), “CIPM Mutual Recognition Arrangement”, Available at <http://www.bipm.org/en/cipm-mra/>, Accessed on June 1st 2011.
[2] Brionizio J. D., Fernicola V.; Banfo M., Lima S. G., “Bilateral Comparison of INMETRO and INRIM Humidity Standards”, in 14th Congrés International de Metrologie, Paris, 2009.
[3] Brionizio J. D., Lima S. G., Pereira G. M., “Garantia da Qualidade de Resultados de Calibração do Laboratório de Higrometria do Inmetro”, in V Congresso Brasileiro de Metrologia, Salvador, 2009.
[4] Hasagawa S. And Little J.W. journal of Research of the National Bureau of standards – A. Physics and Chemistry, January – February 1977 Vol. 81A, No. 1.
[5] Operation and maintenance manual of Series 2500 Bench top Two-Pressure humidity Generator , Copyright © 1991-2001 Thunder Scientific Corporation.
[6] Lovell – Smith, J., 2000 Ucertainty Analysis for humidity generators – I.R.L. report Nº 988 – MSL Hutt April 2000
[7] Hardy R. 1998, ITS90 formulation for vapor pressure, frostpoint temperature, dewpoint temperature and enhancement factor in the range -100 ºC to +100 ºC, in Papers and Abstracts from the Third International Symposium on Humidity and Moisture; NPL, London, 1998, 1, pp.214 222.
[8] Carpentier V., Megharfi1 M., Quint J., Priel M., Desenfant M and Morice R., Estimation of hygrometry uncertainties by propagation of distributions, Metrologia 41 (2004) 432 - 438.
[9] BIPM, IEC, IFCC, ISO, et al., “Guide to the Expression of Uncertainty in Measurement”, 3rd Ed., 2003.
[10] ISO/IEC Guide 43-1, “Proficiency Testing by Interlaboratory Comparisons – Part 1: Development and Operation of Proficiency Testing Schemes”, 1997
SIM.T-K6.4 – INMETRO / INTI - Final Report Appendix 1: CMCs Mass and Related Quantities, INTI AR
Calibration and Measurement Capabilities
Mass and Related Quantities, Argentina, INTI (Instituto Nacional de Tecnologia Industrial)
Calibration or Measurement Service
Measurand Level or Range
Measurement Conditions/Independent Variable
Class Mass Mass Mass Mass Mass Mass Mass Mass Mass Mass Mass Mass
Instrument or Artifact
Mass standard Mass standard Mass standard Mass standard Mass standard Mass standard Mass standard Mass standard Mass standard Mass standard Mass standard Mass standard
Instrument Type Minimum Maximum
or Method
value
value
Units
Parameter
Specifications
Subdivision method
1
1
mg Temperature ((18 to 22 ) ± 0.5) °C
Humidity
((40 to 60) ± 7) %
Subdivision method
2
2
mg Temperature ((18 to 22 ) ± 0.5) °C
Humidity
((40 to 60) ± 7) %
Subdivision method
5
5
mg Temperature ((18 to 22 ) ± 0.5) °C
Humidity
((40 to 60) ± 7) %
Subdivision method
10
10
mg Temperature ((18 to 22 ) ± 0.5) °C
Humidity
((40 to 60) ± 7) %
Subdivision method
20
20
mg Temperature ((18 to 22 ) ± 0.5) °C
Humidity
((40 to 60) ± 7) %
Subdivision method
50
50
mg Temperature ((18 to 22 ) ± 0.5) °C
Humidity
((40 to 60) ± 7) %
Subdivision method
100
100
mg Temperature ((18 to 22 ) ± 0.5) °C
Humidity
((40 to 60) ± 7) %
Subdivision method
200
200
mg Temperature ((18 to 22 ) ± 0.5) °C
Humidity
((40 to 60) ± 7) %
Subdivision method
500
500
mg Temperature ((18 to 22 ) ± 0.5) °C
Humidity
((40 to 60) ± 7) %
Subdivision method
1
1
g Temperature ((18 to 22 ) ± 0.5) °C
Humidity
((40 to 60) ± 7) %
Subdivision method
2
2
g Temperature ((18 to 22 ) ± 0.5) °C
Humidity
((40 to 60) ± 7) %
Subdivision method
5
5
g Temperature ((18 to 22 ) ± 0.5) °C
Humidity
((40 to 60) ± 7) %
Value 0.0007 0.0007 0.0008 0.0008 0.0008 0.001 0.001 0.0015 0.002 0.0025 0.0025 0.0045
Expanded Uncertainty
Units
Coverage Level of Factor Confidence
Is the expanded uncertainty a relative one?
mg
2
95%
No
Comments
mg
2
95%
No
mg
2
95%
No
mg
2
95%
No
mg
2
95%
No
mg
2
95%
No
mg
2
95%
No
mg
2
95%
No
mg
2
95%
No
mg
2
95%
No
mg
2
95%
No
mg
2
95%
No
NMI Service Identifier
The BIPM key comparison database, February 2012
1/7
Calibration and Measurement Capabilities
Mass and Related Quantities, Argentina, INTI (Instituto Nacional de Tecnologia Industrial)
Calibration or Measurement Service
Measurand Level or Range
Measurement Conditions/Independent Variable
Class Mass Mass Mass Mass Mass Mass Mass Mass Mass Mass Mass Mass Mass
Instrument or Artifact
Instrument Type Minimum Maximum
or Method
value
value
Units
Parameter
Specifications
Mass standard
Subdivision method
10
10
g Temperature ((18 to 22 ) ± 0.5) °C
Humidity
((40 to 60) ± 7) %
Mass standard
Subdivision method
20
20
g Temperature ((18 to 22 ) ± 0.5) °C
Humidity
((40 to 60) ± 7) %
Mass standard
Subdivision method
50
50
g Temperature ((18 to 22 ) ± 0.5) °C
Humidity
((40 to 60) ± 7) %
Mass standard
Subdivision method
100
100
g Temperature ((18 to 22 ) ± 0.5) °C
Humidity
((40 to 60) ± 7) %
Mass standard
Subdivision method
200
200
g Temperature ((18 to 22 ) ± 0.5) °C
Humidity
((40 to 60) ± 7) %
Mass standard
Subdivision method
500
500
g Temperature ((18 to 22 ) ± 0.5) °C
Humidity
((40 to 60) ± 7) %
Mass standard
Subdivision method
1
1
kg Temperature ((18 to 22 ) ± 0.5) °C
Humidity
((40 to 60) ± 7) %
Mass standard
Subdivision method
2
2
kg Temperature ((18 to 22 ) ± 0.5) °C
Humidity
((40 to 60) ± 7) %
Mass standard
Subdivision method
5
5
kg Temperature ((18 to 22 ) ± 0.5) °C
Humidity
((40 to 60) ± 7) %
Mass standard
Mass comparator, dissemination
10
10
kg Temperature ((18 to 22 ) ± 0.5) °C
Humidity
((40 to 60) ± 7) %
Mass standard Direct comparison 20
20
kg Temperature ((18 to 22 ) ± 0.5) °C
Humidity
((40 to 60) ± 7) %
Mass standard Direct comparison 50
50
kg Temperature ((18 to 22 ) ± 0.5) °C
Humidity
((40 to 60) ± 7) %
Mass standard Direct comparison 100
100
kg Temperature ((18 to 22 ) ± 1.5) °C
Humidity
((40 to 60) ± 7) %
Value 0.008 0.008 0.01 0.02 0.035 0.08 0.15
0.5 0.8 1.5 10 25 2
Expanded Uncertainty
Units
Coverage Level of Factor Confidence
Is the expanded uncertainty a relative one?
mg
2
95%
No
Comments
mg
2
95%
No
mg
2
95%
No
mg
2
95%
No
mg
2
95%
No
mg
2
95%
No
mg
2
95%
No
mg
2
95%
No
mg
2
95%
No
mg
2
95%
No
mg
2
95%
No
mg
2
95%
No
g
2
95%
No
NMI Service Identifier
The BIPM key comparison database, February 2012
2/7
Calibration and Measurement Capabilities
Mass and Related Quantities, Argentina, INTI (Instituto Nacional de Tecnologia Industrial)
Calibration or Measurement Service
Measurand Level or Range
Measurement Conditions/Independent Variable
Class
Instrument or Artifact
Instrument Type Minimum Maximum
or Method
value
value
Units
Parameter
Specifications
Value
Mass
Mass standard Direct comparison 200
200
Mass
Mass standard Direct comparison 500
500
Mass
Mass standard Direct comparison 1000
1000
Mass
Mass standard Direct comparison 5000
5000
Density of solid
Volume of mass standard 1 g
Hydrostatic weighing by weight comparison
0.104
0.145
Density of solid
Volume of mass standard 2 g
Hydrostatic weighing by weight comparison
0.225
0.275
Density of solid
Volume of mass standard 5 g
Hydrostatic weighing
0.594
0.6562
kg Temperature ((18 to 22 ) ± 1.5) °C
Humidity
((40 to 60) ± 7) %
kg Temperature ((18 to 22 ) ± 1.5) °C
Humidity
((40 to 60) ± 7) %
kg Temperature ((18 to 22 ) ± 1.5) °C
Humidity
((40 to 60) ± 7) %
kg Temperature ((15 to 25 ) ± 3) °C
Humidity ((40 to 60) ± 20) %
cm3
Water temperature
20 °C
Air temperature
((18 to 22 ) ± 0.5) °C
Humidity
((40 to 60) ± 7) %
cm3
Water temperature
20 °C
Air temperature
((18 to 22 ) ± 0.5) °C
Humidity
((40 to 60) ± 7) %
cm3
Water temperature
20 °C
3 8 15 150 0.0008
0.0008
0.0015
Expanded Uncertainty
Units
Coverage Level of Factor Confidence
Is the expanded uncertainty a relative one?
g
2
95%
No
Comments
g
2
95%
No
g
2
95%
No
g
2
95%
No
cm3
2
95%
No
cm3
2
95%
No
cm3
2
95%
No
NMI Service Identifier
The BIPM key comparison database, February 2012
3/7
Calibration and Measurement Capabilities
Mass and Related Quantities, Argentina, INTI (Instituto Nacional de Tecnologia Industrial)
Calibration or Measurement Service
Measurand Level or Range
Measurement Conditions/Independent Variable
Class
Instrument or Artifact
Instrument Type Minimum Maximum
or Method
value
value
Units
Parameter
Specifications
Value
Density of solid
Volume of mass standard 10 g
Density of solid
Volume of mass standard 20 g
Density of solid
Volume of mass standard 50 g
Density of solid
Volume of mass standard 100 g
Density of solid
Volume of mass standard 200 g
Density of solid
Volume of mass standard 500 g
Density of solid
Volume of mass standard 1 kg
Density of solid
Volume of mass standard 2 kg
Hydrostatic weighing
1.208
1.292
Hydrostatic weighing
2.448
2.551
Hydrostatic weighing
6.188
6.313
Hydrostatic weighing
12.396 12.604
Hydrostatic weighing
24.792 25.208
Hydrostatic weighing
61.981
63.02
Hydrostatic weighing
123.962 126.04
Hydrostatic weighing
247.924 252.08
Air temperature
((18 to 22 ) ± 0.5) °C
Humidity
((40 to 60) ± 7) %
cm3
Water temperature
20 °C
0.0015
Air temperature
((18 to 22 ) ± 0.5) °C
Humidity
((40 to 60) ± 7) %
cm3
Water temperature
20 °C
0.002
Air temperature
((18 to 22 ) ± 0.5) °C
Humidity
((40 to 60) ± 7) %
cm3
Water temperature
20 °C
0.002
Air temperature
((18 to 22 ) ± 0.5) °C
Humidity
((40 to 60) ± 7) %
cm3
Water temperature
20 °C
0.0035
Air temperature
((18 to 22 ) ± 0.5) °C
Humidity
((40 to 60) ± 7) %
cm3
Water temperature
20 °C
0.0069
Air temperature
((18 to 22 ) ± 0.5) °C
Humidity
((40 to 60) ± 7) %
cm3
Water temperature
20 °C
0.017
Air temperature
((18 to 22 ) ± 0.5) °C
Humidity
((40 to 60) ± 7) %
cm3
Water temperature
20 °C
0.035
Air temperature
((18 to 22 ) ± 0.5) °C
Humidity
((40 to 60) ± 7) %
cm3
Water temperature
20 °C
0.069
Expanded Uncertainty
Units
Coverage Level of Factor Confidence
Is the expanded uncertainty a relative one?
Comments
cm3
2
95%
No
cm3
2
95%
No
cm3
2
95%
No
cm3
2
95%
No
cm3
2
95%
No
cm3
2
95%
No
cm3
2
95%
No
cm3
2
95%
No
NMI Service Identifier
The BIPM key comparison database, February 2012
4/7
Calibration and Measurement Capabilities
Mass and Related Quantities, Argentina, INTI (Instituto Nacional de Tecnologia Industrial)
Calibration or Measurement Service
Measurand Level or Range
Class
Instrument or Artifact
Instrument Type Minimum Maximum
or Method
value
value
Units
Density of solid
Volume of mass standard 5 kg
Hydrostatic weighing
619.81
630.2
cm3
Density of solid
Volume of mass standard 10 kg
Hydrostatic weighing
1239.62 1260.4
cm3
Density of solid
Volume of mass standard 20 kg
Weighing of the displaced liquid
2479.24
2520.8
cm3
Density of solid
Volume of mass standard 50 kg
Weighing of the displaced liquid
6198.09
6301.99
cm3
Density of liquid
Hydrometers
Cuckow method,
weighing
0.65
hydrostatic
2
g/cm3
Absolute Pressure
Absolute Pressure
Absolute Pressure
Pressure gauge
Gas medium 1,5E+03 4,0E+04
Pa
Pressure gauge
Gas medium 4,0E+04 7,0E+06
Pa
Pressure gauge
Gas medium 7,1E+06 1,21E+07 Pa
Measurement Conditions/Independent Variable
Expanded Uncertainty
Parameter
Specifications
Value
Air temperature
((18 to 22 ) ± 0.5) °C
Humidity
((40 to 60) ± 7) %
Water temperature
20 °C
0.17
Air temperature
((18 to 22 ) ± 0.5) °C
Humidity
((40 to 60) ± 7) %
Water temperature
20 °C
0.35
Air temperature
((18 to 22 ) ± 0.5) °C
Humidity
((40 to 60) ± 7) %
Water temperature
20 °C
0.5
Air temperature
((18 to 22) ± 0.5) °C
Humidity
((40 to 60) ± 7) %
Water temperature
20 °C
1
Air temperature
((18 to 22 ) ± 0.5) °C
Humidity
((40 to 60) ± 7) %
Water temperature
15 °C to 20 °C
0.0001
Air temperature
Humidity
20 °C 40% to 60%
4
(2.0 + 5E05p ), p
pressure in Pa
6E-05p , p pressure in
Pa
Units
Coverage Level of Factor Confidence
Is the expanded uncertainty a relative one?
Comments
cm3
2
95%
No
cm3
2
95%
No
cm3
2
95%
No
cm3
2
95%
No
g/cm3
2
95%
No
Pa
2
Pa
2
Pa
2
95% 95% 95%
No
Approved on 12 February 2009
No
Approved on 12 February 2009
No
Approved on 12 February 2009
NMI Service Identifier
The BIPM key comparison database, February 2012
5/7
Calibration and Measurement Capabilities
Mass and Related Quantities, Argentina, INTI (Instituto Nacional de Tecnologia Industrial)
Calibration or Measurement Service
Measurand Level or Range
Class
Instrument or Artifact
Instrument Type Minimum Maximum
or Method
value
value
Units
Absolute Pressure
Absolute Pressure
Pressure gauge
Oil medium 2,0E+05 1,0E+08
Pa
Pressure gauge
Oil medium 1,0E+08 4,0E+08
Pa
Gauge Presure Pressure gauge
Gas medium -1,0E+05 -5,0E+03
Pa
Gauge Presure Pressure gauge
Gas medium -5,0E+03 -1,5E+03
Pa
Gauge Presure Pressure gauge
Gas medium -1,5E+03 1,5E+03
Pa
Gauge Presure Pressure gauge
Gas medium 1,5E+03 5,0E+03
Pa
Gauge Presure
Pressure balance, pressure gauge
Gas medium
5,0E+03 7,0E+06
Pa
Gauge Presure
Pressure balance, pressure gauge
Gas medium
7,0E+06 1,20E+07
Pa
Gauge Presure
Pressure balance, pressure gauge
Oil medium
1,0E+05 1,0E+08
Pa
Gauge Presure
Pressure balance, pressure gauge
Oil medium
1,0E+08 4,0E+08
Pa
Force, tension and compression
Force measuring device
Direct comparison
500
1000
N
Force, tension and compression
Force measuring device
Direct comparison
1
2.5
kN
Measurement Conditions/Independent Variable
Parameter
Specifications
Value
Temperature Temperature
(30 + 5E05p ), p pressure in
Pa (4E-05p + 2.1E-13p 2), p pressure
in Pa (1 + 4E05p ), p absolute value of the gauge pressure in
Pa
2
0.03
2
(1 + 4E05p ), p pressure in
Pa 5E-05p , p pressure in
Pa (30 + 4E05p ), p pressure in
Pa (4E-05p + 2.1E-13p 2), p pressure
in Pa
0.0004
0.0004
Expanded Uncertainty
Units
Coverage Level of Factor Confidence
Is the expanded uncertainty a relative one?
Comments
Pa
2
95%
No
Approved on 12 February 2009
Pa
2
95%
No
Approved on 12 February 2009
Pa
2
95%
Pa
2
Pa
2
Pa
2
Pa
2
Pa
2
Pa
2
95% 95% 95% 95%
95%
95%
Pa
2
95%
2
95.45%
2
95.45%
No
Approved on 12 February 2009
No
Approved on 12 February 2009
No
Approved on 12 February 2009
No
Approved on 12 February 2009
No
Approved on 12 February 2009
No
Approved on 12 February 2009
No
Approved on 12 February 2009
No
Approved on 12 February 2009
Yes Yes
NMI Service Identifier
The BIPM key comparison database, February 2012
6/7
Calibration and Measurement Capabilities
Mass and Related Quantities, Argentina, INTI (Instituto Nacional de Tecnologia Industrial)
Calibration or Measurement Service
Measurand Level or Range
Measurement Conditions/Independent Variable
Class
Instrument or Artifact
Instrument Type Minimum Maximum
or Method
value
value
Units
Parameter
Specifications
Force, tension and compression
Force measuring device
Direct comparison
2.5
Force, tension and compression
Force measuring device
Direct comparison
5
Force, tension and compression
Force measuring device
Direct comparison
10
Force, tension and compression
Force measuring device
Direct comparison
20
Force, tension and compression
Force measuring device
Direct comparison
50
Force, tension and compression
Force measuring device
Direct comparison
110
Force, tension and compression
Force measuring device
Direct comparison
150
Force, tension and compression
Force measuring device
Direct comparison
200
Force, tension and compression
Force measuring device
Direct comparison
500
Volume of liquids
Glassware (pycnometers, pipettes, buretes,
flasks)
Gravimetric, distilled and deaerated water
10
Volume of liquids
Glassware (pycnometers, pipettes, buretes,
flasks)
Gravimetric, distilled and deaerated water
0.1
Volume of liquids
Volumetric test measures
(graduated neck type)
Gravimetric, distilled and deaerated water
5
Volumetric test
Volume of liquids
measures (graduated neck
Gravimetric
100
type)
5 10 20 50 110 150 200 500 999 100
1
40
5000
kN Temperature kN Temperature kN Temperature kN Temperature kN Temperature kN Temperature kN Temperature kN Temperature kN Temperature
ml Temperature 19 ºC to 21 ºC
l
Temperature 19 ºC to 21 ºC
l
Temperature
ambient
l
Temperature
ambient
Value
0.0004 0.0003 0.0005 0.0001 0.0001 0.0003 0.0003 0.0004 0.0003
0.05
0.03
0.015
0.015
Expanded Uncertainty
Units
Coverage Level of Factor Confidence
Is the expanded uncertainty a relative one?
2
95.45%
Yes
2
95.45%
Yes
2
95.45%
Yes
2
95.45%
Yes
2
95.45%
Yes
2
95.45%
Yes
2
95.45%
Yes
2
95.45%
Yes
2
95.45%
Yes
Comments
NMI Service Identifier
%
2
95%
Yes
Approved on 13 102.04.05.00.00
February 2012
4
%
2
95%
Yes
Approved on 13 102.04.05.00.00
February 2012
4
%
2
95%
Yes
Approved on 13 102.04.05.00.00
February 2012
5
%
2
95%
Yes
Approved on 13 102.04.05.00.00
February 2012
5
The BIPM key comparison database, February 2012
7/7
SIM.T-K6.4 – INMETRO / INTI - Final Report Appendix 2: CMCs Thermometry, INTI AR
The BIPM key comparison database
Thermometry, Argentina, INTI (Instituto Nacional de Tecnologia Industrial)
Calibration or Measurement Services
Measurand Level or Range
Measurement Conditions/Independent variables
Expanded Uncertainty
Quantity
Instrument or artifact
Instrument Type Minimum Maximum
or Method
value
value
units
Parameter
Specifications
Value
Units
Coverage Factor
Level of Confidence
Is the expanded uncertainty a relative one?
NMI Service Identifier
Comments
Temperature
PRT
Comparison with SPRT
-25
10
°C
temperature
Bath
controlled ethylene glycol and water
0.1
°C
2
bath
95%
Hysteresis
uncertainty for each
IPRT must be added
No
PEC08 or PEC13
to the combined uncertainty quoted in
the Calibration
Report
Approved on 12 July
2007
Temperature
PRT
Comparison with SPRT
10
80
°C
temperature
Bath
controlled water
0.02
°C
2
bath
95%
Hysteresis
uncertainty for each
IPRT must be added
No
PEC08 or PEC13
to the combined uncertainty quoted in
the Calibration
Report
Approved on 12 July
2007
Temperature
PRT
Comparison with SPRT
80
200
°C
temperature
Bath
controlled siliconed 0.03
°C
2
oil bath
95%
Hysteresis
uncertainty for each
IPRT must be added
No
PEC08 or PEC13
to the combined uncertainty quoted in
the Calibration
Report
Approved on 12 July
2007
Calibration and Measurement Capabilities, August 2007
1/3
The BIPM key comparison database
Thermometry, Argentina, INTI (Instituto Nacional de Tecnologia Industrial)
Calibration or Measurement Services
Measurand Level or Range
Measurement Conditions/Independent variables
Expanded Uncertainty
Quantity
Instrument or artifact
Instrument Type Minimum Maximum
or Method
value
value
units
Parameter
Specifications
Value
Units
Coverage Factor
Level of Confidence
Is the expanded uncertainty a relative one?
NMI Service Identifier
Comments
Temperature
PRT
Comparison with SPRT
200
400
°C
Mercury-in-glass Total immersion,
Temperature thermometer 0.1 °C comparison with
-25
10
°C
graduation
SPRT
Mercury-in-glass Total immersion,
Temperature thermometer 0.1 °C comparison with
10
80
°C
graduation
SPRT
Mercury-in-glass Total immersion,
Temperature thermometer 0.1 °C comparison with
80
200
°C
graduation
SPRT
Mercury-in-glass Total immersion,
Temperature thermometer 0.2 °C comparison with
-25
10
°C
graduation
SPRT
Mercury-in-glass Total immersion,
Temperature thermometer 0.2 °C comparison with
10
80
°C
graduation
SPRT
Mercury-in-glass Total immersion,
Temperature thermometer 0.2 °C comparison with
80
200
°C
graduation
SPRT
Mercury-in-glass Total immersion,
Temperature thermometer 0.5 °C comparison with
-25
10
°C
graduation
SPRT
temperature
Bath
controlled alumina powder-in air fluid
0.1
°C
2
bath
95%
temperature
Bath
controlled ethylene glycol and water
0.1
°C
2
bath
temperature
Bath
controlled water
0.04
°C
2
bath
temperature
Bath
controlled siliconed 0.05
°C
2
oil bath
temperature
Bath
controlled ethylene glycol and water
0.12
°C
2
bath
temperature
Bath
controlled water
0.07
°C
2
bath
temperature
Bath
controlled siliconed 0.07
°C
2
oil bath
temperature
Bath
controlled ethylene glycol and water
0.2
°C
2
bath
95% 95% 95% 95% 95% 95% 95%
Hysteresis
uncertainty for each
IPRT must be added
No
PEC08 or PEC13
to the combined uncertainty quoted in
the Calibration
Report
Approved on 12 July
2007
No
PEC10
Approved on 12 July 2007
No
PEC10
Approved on 12 July 2007
No
PEC10
Approved on 12 July 2007
No
PEC10
Approved on 12 July 2007
No
PEC10
Approved on 12 July 2007
No
PEC10
Approved on 12 July 2007
No
PEC10
Approved on 12 July 2007
Calibration and Measurement Capabilities, August 2007
2/3
The BIPM key comparison database
Thermometry, Argentina, INTI (Instituto Nacional de Tecnologia Industrial)
Calibration or Measurement Services
Measurand Level or Range
Measurement Conditions/Independent variables
Expanded Uncertainty
Quantity
Instrument or artifact
Instrument Type Minimum Maximum
or Method
value
value
Mercury-in-glass Total immersion,
Temperature thermometer 0.5 °C comparison with
10
80
graduation
SPRT
Mercury-in-glass Total immersion,
Temperature thermometer 0.5 °C comparison with
80
200
graduation
SPRT
Temperature
Type E thermocouple
Comparison with thermocouples
0
900
Temperature
Type J thermocouple
Comparison with thermocouples
0
700
Temperature
Type K or N thermocouple
Comparison with thermocouples
0
1100
Temperature
Type T thermocouple
Comparison with thermocouples
0
400
units
Parameter
Specifications
Value
Units
Coverage Factor
Level of Confidence
Is the expanded uncertainty a relative one?
NMI Service Identifier
Comments
temperature
°C
Bath
controlled water
0.2
°C
2
95%
bath
No
PEC10
Approved on 12 July 2007
temperature
°C
Bath
controlled siliconed
0.2
°C
2
95%
oil bath
No
PEC10
Approved on 12 July 2007
Isothermal block
°C
in temperature
controlled furnace
[0.5 +
0.0009 t
°C
2
/(°C)]
95%
Pre-determined value
of inhomogeneity
No
PEC09
included in the CMC entry
Approved on 12 July
2007
Isothermal block
°C
in temperature
controlled furnace
[0.5 +
0.0009 t
°C
2
/(°C)]
95%
Pre-determined value
of inhomogeneity
No
PEC09
included in the CMC entry
Approved on 12 July
2007
Isothermal block
°C
in temperature
controlled furnace
[0.5 +
0.0009 t
°C
2
/(°C)]
95%
Pre-determined value
of inhomogeneity
No
PEC09
included in the CMC entry
Approved on 12 July
2007
Isothermal block
°C
in temperature
controlled furnace
[0.5 +
0.0009 t
°C
2
/(°C)]
95%
Pre-determined value
of inhomogeneity
No
PEC09
included in the CMC entry
Approved on 12 July
2007
Calibration and Measurement Capabilities, August 2007
3/3
SIM.T-K6.4 – INMETRO / INTI - Final Report Appendix 3: Uncertainty budget for INTI Standard
Uncertainty of one dew point formation One dew point formation = 1 run composed of 10 readings taken at each 1 minute
The uncertainty in dew point temperature was calculated by propagation of the uncertainties and by propagation of distributions of the following components, in the formula of dew point temperature in function of saturator pressure, chamber pressure and saturator temperature. The applied formulae were obtained of the Industrial Research Limited Report Nº988: Uncertainty Analysis for Humidity Generators - Jeremy Lovell - Smith
average between 10 readings
Uncertainty of saturator pressure measurement (u Ps)
pressure resolution
(traducer range / 25000)*0.5/(3)
pressure calibration INTI report OTI NºFM-102-090-unico
sensor low pressure < 344500 Pa U=68,94757 Pa - sensor high pressure > 344500 Pa U=689,4757 Pa
of average between 10 readings
Uncertainty of chamber pressure measurement (u Pc)
pressure resolution
(traducer range / 25000)*0.5/(3)
pressure calibration INTI report OTI NºFM-102-090-unico
sensor low pressure < 344500 Pa U=68,94757 Pa - sensor high pressure > 344500 Pa U=689,4757 Pa
Uncertainty of saturator temperature measurement (u Ts) of average between 10 readings
temperature resolution
0,01*0,5/((3))
temperature calibration INTI report FM-102-PCC-036
(U=0,02 ºC)
Saturator efficiency, saturator bath uniformity, contamination (U=0,104 ºC)
of supply gas and water
Uncertainty of vapor pressure formula (u ew)
Formulae uncertainty bibliographic data: Industrial Research Limited Report Nº988: Uncertainty Analysis for Humidity Generators - Jeremy Lovell Smith
Uncertainty of enhancement factor formula (u fw)
bibliographic data: Industrial Research Limited Report Nº988: Uncertainty Analysis for Humidity Generators - Jeremy Lovell Smith
Ps: Saturator pressure uP:s Uncertainty of saturator pressure measurement Pc: Chamber pressure uPc: Uncertainty of chamber pressure measurement Ts: Saturator temperature uTs: Uncertainty of saturator temperature measurement
Ps
uPs
Pc
uPc
Ts
uTs
[Pa]
[Pa]
[Pa]
[Pa]
[°C]
[°C]
Dew Point Ref [°C]
710139 710157 710166 710109
347 101067 347 101058 346 100971 349 101142
35
5,00
0,05
35
5,00
0,05
35
5,00
0,05
35
5,00
0,05
-19,9 -19,9 -19,9 -19,9
358516
345 101331
35 20,00
0,05
1,2
358532
345 101333
35 20,00
0,05
1,2
358526
345 101295
35 19,99
0,05
1,2
358504
345 101285
35 19,99
0,05
1,2
138030
35 101303
35 24,99
0,05
19,9
138031
35 101289
35 24,99
0,05
19,9
138028
35 101277
35 24,99
0,05
19,9
137596
35 100791
35 24,99
0,05
19,9
131033
49 101009
35 44,97
0,05
40,0
131021
35 100990
35 44,97
0,05
40,0
131018
35 100983
35 44,97
0,05
40,0
131062
49 100974
35 44,97
0,05
40,0
158133
35 100913
35 69,94
0,05
60,0
158119
40 100912
35 69,94
0,05
60,0
158145
36 100898
35 69,94
0,05
59,9
158142
35 100888
35 69,94
0,05
59,9
U Dew Point Ref [°C], k=2
0,21 0,21 0,21 0,20
0,10 0,10 0,10 0,10
0,10 0,11 0,11 0,10
0,10 0,11 0,11 0,11
0,10 0,10 0,10 0,11
SIM.T-K6.4 – INMETRO / INTI - Final Report Appendix 4: Uncertainty budget for INMETRO Standard.
Uncertainty budget for INMETRO Standard:
Cal.
-20
0,1/2
Res.
Fitting1
Drift2
0
20
0,01 /12
0,013 /1
0,06/(3)
0,06/2
40
60 1 Fitting of the correction curve 2 Repeatability – average of the mean standard deviations of the measurements of the four runs
Rep.2 0,007 0,008 0,002 0,006 0,004
u1 0,063 0,048 0,048 0,048 0,048
Ver+/-
