Intercomparison No. HL-01
Page 1 of 22
มว
NIMT
Thermometry Metrology Department
National Institute of Metrology (Thailand)
The final report for NIMT Electronic Thermo-Hygrometer
Interlaboratory Comparison No. HL-01
Section
1
2
3
4
5
6
7
8
9
10
Appendix A
Appendix B
Appendix C
Appendix D
Last Updated : 15/4/20
Title
Introduction
The artefact
Condition of Artefact
Stability check of the artefact
Estimate of reproducibility
Estimation of interpolation error
Comparison Results
Calculation of a Comparison Reference Value
Elaboration of comparison results
Conclusion
List of participant laboratories
Sequences of participant laboratories
Summary of measurement Results for Electrical
Thermo-Hygrometer
Summary of result analysis was calculated by 1st
order polynomial equation
Intercomparison No. HL-01
Page 2 of 22
The Draft Report for Electronic Thermo-Hygrometer
Interlaboratory Comparison No. HL-01
1. Introduction
The national interlaboratory comparison program on humidity measurement was firstly
proposed at the 1st Temp club meeting in 2008 by Department of Thermometry Metrology,
NIMT. A main objective of this program is to identify the measurement capability in
relative humidity of any secondary calibration laboratory in Thailand. In addition, this
project has been undertaken to improve the dissemination of relative humidity
measurement in Thailand.
The first inquiry of interest was circulated in October 2006. Based on the feedback, a
preliminary protocol was sent to all interested laboratories in November 2008. A final
protocol was sent to and approved by all participating laboratories before the start of the
comparison. NIMT offered two electronic thermo-hygrometers as transfer standards for
relative humidity. The comparison range covers the relative humidity from 20%rh to
80%rh, accepted by all participating
The first period of comparison was hold from January 2009 to October 2009. NIMT was
the first laboratory to calibrate the artefact and then the transfer standard was sent to all
participating laboratories as listed in Appendix A. The sequences of laboratories were shown
in Appendix B, separated in two loops. The second period was concerned by NIMT about
collection and evaluation of all measurement results, as well as preparation of the
comparison report.
In details, results of stability check of two artefacts measured by NIMT are shown in
chapter 4, along with their reproducibility in chapter 5. More details in calculation of
interpolation error are described in chapter 6. Then a summary of comparison results are
presented in chapter 7. In addition, comparison reference values for this comparison are
analyzed in chapter 8 and then the degree of equivalences for each laboratory are calculated
in term of difference from the calibration reference values as shown in chapter 9.
2
The artefact
Artefacts are Electronic Thermo-Hygrometers range 20%rh to 90%rh in air
@ 25oC and atmospheric pressure. Their specifications are shown below.
Temperature Range and Accuracy – “H” Model
16 °C to 24 °C: ± 0.125 °C (calibrated)
0 °C to 16 °C, 24 °C to 50 °C: ± 0.5 °C (uncalibrated typical)
RH Range and Accuracy – “H” Model
20 % to 70 % RH: ± 1.5 % RH (calibrated)
0 % to 20 % RH, 70 % to 100 % RH: ± 3 % RH (uncalibrated, typical)
RH Resolution User selectable up to 0.01 % (on front-panel display)
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Intercomparison No. HL-01
3
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Condition of Artefact
The ambient temperature of the laboratory should be within (23 ± 3)oC and the ambient
relative humidity should be within (50 ± 20) % during the calibration.
The electronic thermo-hygrometers were calibrated by NIMT using a two pressure
humidity generator checked with a dew-point hygrometer. The measuring point of artefacts
in relative humidity are 20%, 30%, 40%, 50%, 60%, 70%, and 80% at the fixed
temperature of 25°C. However only 9 laboratories performed the first measuring point at
30%rh, while 14 laboratories performed the last point at 80%rh.
Over the period of the measurement, the comparison went well until repeated measurement
by the pilot laboratory. Moreover any physical damage was not found after the returning to
NIMT.
4
Stability check of the artefacts
The stability of the artefacts during the comparison was checked by comparison with the
primary standard generator of NIMT. For all comparison points, the artefacts were checked
firstly before sending to the first participant, during the comparison process and finally
after the last measurement as scheduled.
For the artefact S/N: A72176+A7A935, the measurement was performed for 3 times to
evaluate the differences from the NIMT standard. The stability in terms of change from the
first measurement are graphically shown in Figure 1
2nd
3rd
Changefrom1stmeasurement,%rh
0.0
-0.2
0
10
20
30
40
50
60
70
-0.4
-0.6
-0.8
-1.0
-1.2
RelativeHumidityPoint(%rh)
Figure 1 Stability of the artefact S/N:A72176+A7A935
Last Updated : 15/4/20
80
90
Intercomparison No. HL-01
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For the artefact S/N: A72177+A72146, the measurement was performed for 4 times and its
changes from the first measurement are graphically shown in Figure 2.
2nd
3rd
4th
Changefrom1stmeasurement,%rh
0.0
-0.1 0
20
40
60
80
100
-0.2
-0.3
-0.4
-0.5
-0.6
RelativeHumidityPoint(%rh)
Figure 2 Stability of the artefact S/N:A72177+A72146
It seems the long-term stability of the first artefact is well within about 0.7 %rh while the
second artefact is well within 0.5 %rh cover the comparison range.
5. Estimation of reproducibility
Since the long-term stability of the two artefacts consists of the drift of the artefact and also
a reproducibility of the measurements by the reference laboratory, an estimation of the
reproducibility of the measurement by NIMT is required to ensure the comparison results.
The artefact S/N: A72176+A7A935 was calibrated three times and S/N: A72177+A72146
was calibrated four times by the reference laboratory against the NIMT primary humidity
generator. In analysis of data results, the reference laboratory needs to evaluate its
reproducibility of the measurement for uncertainty estimation. The uncertainty of
reproducibility would be given by
uref, reprod  stdev drift / n
i
(1).
The drifts at each time of measurements for different artefacts are show in Table 1. In this
comparison, the calibration data for seven times was used to estimate the reproducibility of
the reference laboratory.
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Intercomparison No. HL-01
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Table 1 Difference between the artefact and the reference value of NIMT calibration.
the difference between the average of initial and final calibration for each loop.
No. of artifact
20.00
30.00
40.00
50.00
60.00
70.00
80.00
A72176+A7A935
-0.19
-0.20
-0.21
-0.22
-0.23
-0.24
-0.25
A72177+A72146
-0.14
-0.10
-0.08
-0.06
-0.05
-0.03
-0.01
6. Estimation of interpolation error
Since the measuring points obtained from each participating laboratory were slightly
deviated from the defined measuring point, an interpolation was applied in order to
compare all measurement results at the same nominal values. In this case, the 1st-order
polynomial equation was used to interpolate from the measurement data of each laboratory
and then the results at the nominal measuring points were determined using fitting
coefficients, and are given by,
y = mX + c
(2)
The errors of interpolation were also considered as a component of this comparison
uncertainty. Tables of the interpolation errors at any points for each loop are shown below:
Table 2. Estimated interpolation error at the measuring points for each laboratory
Electronic Thermo-Hygrometer Comparison, S/N:A72176+A7A935
Participants/point
20.00
30.00
40.00
50.00
60.00
70.00
80.00
NIMT
0.14
-0.05
-0.09
-0.13
0.03
0.06
0.03
H01
0.17
-0.19
0.05
-0.19
0.14
-0.01
0.03
H02
-
-0.01
-0.02
-0.02
0.06
0.11
-0.11
H03
-
0.03
0.27
-0.21
-0.27
-0.02
0.21
NIMT
0.10
0.00
-0.01
-0.08
-0.13
-0.03
0.15
H10
-
-0.43
0.99
-0.58
0.29
-0.68
0.40
H11
0.14
0.05
-0.13
-0.22
0.07
0.03
0.08
H12
0.15
0.06
-0.07
-0.20
-0.18
-0.01
0.23
NIMT
0.27
0.07
-0.14
-0.31
-0.23
0.01
0.34
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Electronic Thermo-Hygrometer Comparison, S/N:A72177+A72146
Participants/point
20.00
30.00
40.00
50.00
60.00
70.00
80.00
NIMT
0.12
0.00
-0.07
-0.13
-0.09
0.02
0.11
H07
-
0.27
0.22
-0.36
-0.50
-0.18
0.54
H08
0.40
-0.09
-0.46
-0.12
0.09
0.08
0.10
H09
-0.18
0.20
0.17
-0.10
0.05
-0.44
0.29
NIMT
0.13
-0.02
-0.05
-0.10
-0.12
0.00
0.14
H04
-
0.24
-0.05
-0.24
-0.10
-0.02
0.18
H05
-
-
0.15
-0.10
-0.14
0.00
0.09
H16
-
-0.25
-0.25
0.56
0.36
-0.17
-0.26
NIMT
0.24
0.03
-0.16
-0.20
-0.17
-0.01
0.27
H13
-
0.36
-0.25
0.06
-0.45
-0.09
0.35
H14
-
0.65
-0.02
-0.60
-0.69
0.05
0.62
NIMT
0.21
0.00
-0.15
-0.18
-0.07
0.04
0.15
7. Comparison Results
Table 3 gives results of each laboratory in terms of the differences between the participant
results and the average value of the pilot laboratory.
Table 3 Differences between the participant laboratory and the average reference
laboratory
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Differences between the participant laboratory and the average reference laboratory
Participants/point
20.00
30.00
40.00
50.00
60.00
70.00
80.00
H01
-0.75
-0.94
-1.12
-1.30
-1.49
-1.67
-1.85
H02
-
-0.98
-1.34
-1.69
-2.04
-2.40
-2.75
H03
-
0.42
0.26
0.10
-0.06
-0.23
-0.39
H04
-
0.64
1.15
1.67
2.19
2.71
3.22
H05
-
-
-0.22
-0.22
-0.22
-0.21
-0.21
H07
-
0.06
0.12
0.18
0.24
0.29
0.35
H08
-0.53
-0.55
-0.51
-0.46
-0.42
-0.37
-0.33
H09
-0.36
-0.36
-0.30
-0.24
-0.19
-0.13
-0.07
H10
-
-1.52
-1.38
-1.25
-1.11
-0.98
-0.84
H11
-0.99
-0.69
-0.39
-0.09
0.21
0.51
0.80
H12
0.10
0.05
0.01
-0.04
-0.09
-0.14
-0.19
H13
-
0.39
0.34
0.28
0.22
0.17
0.11
H14
-
2.56
2.25
1.94
1.63
1.32
1.01
H16
-
-0.22
-0.52
-0.83
-1.13
-1.44
-1.75
Interlaboratory Comparison for
Electronic Thermo-Hygrometer @ 20%rh
2.00
Difference Value ( %rh )
1.50
1.00
0.50
0.00
-0.50
-1.00
-1.50
-2.00
-2.50
-3.00
Lab Code
Interlaboratory Comparison for
Electronic Thermo-Hygrometer @ 30%rh
5.00
Difference Value ( %rh )
4.00
3.00
2.00
1.00
0.00
-1.00
-2.00
-3.00
-4.00
Lab Code
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Intercomparison No. HL-01
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Interlaboratory Comparison for
Electronic Thermo-Hygrometer @ 40%rh
4.00
Difference Value ( %rh )
3.00
2.00
1.00
0.00
-1.00
-2.00
-3.00
-4.00
Lab Code
Interlaboratory Comparison for
Electronic Thermo-Hygrometer @ 50%rh
5.00
Difference Value ( %rh )
4.00
3.00
2.00
1.00
0.00
-1.00
-2.00
-3.00
-4.00
Lab Code
Interlaboratory Comparison for
Electronic Thermo-Hygrometer @ 60%rh
5.00
Difference Value ( %rh )
4.00
3.00
2.00
1.00
0.00
-1.00
-2.00
-3.00
-4.00
-5.00
Lab Code
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Intercomparison No. HL-01
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Interlaboratory Comparison for
Electronic Thermo-Hygrometer @ 70%rh
6.00
Difference Value ( %rh )
4.00
2.00
0.00
-2.00
-4.00
-6.00
Lab Code
Interlaboratory Comparison for
Electronic Thermo-Hygrometer @ 80%rh
Difference Value ( %rh )
6.00
4.00
2.00
0.00
-2.00
-4.00
-6.00
Lab Code
Figure 3. Difference of Xi= Xlab-Xavg, ref for each participant together with its assigned
uncertainty. The measurement uncertainties for each laboratory (k=2) are reported by each
participant in Appendix C
8. Calculation of a Comparison Reference Value
The comparison reference value (CRV) has been calculated by weight mean averaging
because of significantly large difference in uncertainties for all laboratories. The weighted
CRV and its associated uncertainty are calculated by:
where
Xweighted = Σ Xi•u-2 (Xi) ⁄ Σ u-2 (Xi)
(3),
u2(Xweighted) = 1/Σ u-2(Xi)
(4),
u(Xi) uncertainty of each laboratory
u2(Di) = u2 (Xlab,i) + (drifti 2/ 2√3) + (u2ref.reprod) + (u2inter)
(5),
In this case, Birge ratio must be calculated because the all uncertainties are related with
measured variance of the comparison data and the estimated measurement uncertainties
explained in the measured dispersion of the actual data values, and are given by,
2 -2
Birge Ratio = √ [ Σ (Xi ─ Xweighted ) u (Xi ) ⁄ (n-1) ]
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(6),
Intercomparison No. HL-01
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If the deviation of the data points Xi from the weighted mean is within the uncertainty (Xi)
of the data, then the Birge ratio will be less than 1, and if the deviation of the data is larger
than expected from the error bars, the Birge ratio will be greater than 1. A statistical
criterion for a Birge ratio for n data points is given by:
Birge Criterion < √ [1 + √8 ⁄(n-1)]
(7),
Therefore, in this comparison, the average criterion is 1.1 for 15 laboratories.
After all comparison datas are completely calculated, the obtained Birge ratio should be
lower than or equal to the calculated Birge criterion (≤1.1). However, it was found that
the first estimated Birge ratios including all participant results were higher than 1.1
excepting for the results at 20 %, as shown in the second row in Table 4. From the results
in last section, the results from the failed laboratories were excluded to calculate the
second Birge ratio as shown in the third row in Table 4. From the new estimation, the
Birge ratios for all nominal point are well within the Birge criterion.
Table 4 The comparison of Birge ratio with failed results to without failed results.
Relative Humidity
(%rh)
Birge Ratio
form Eq.6
Birge Ratio without
failed values
form Eq.6
Code of deviated
participant
Birge Citerion
form Eq.7
20.00
0.76
0.76
-
1.25*
30.00
1.18
0.88
H14
1.10
40.00
1.41
0.65
H02, H14
1.10
50.00
1.06
0.87
H14
1.10
60.00
1.11
0.78
H02, H04
1.10
70.00
1.19
0.97
H04
1.10
80.00
1.28
0.83
H02, H04
1.10
* The average criterion is calculated for 6 laboratories.
9.
Elaboration of comparison results
The obtained comparison reference values are compared to the laboratory values in terms
of the degree of equivalence Di of the participant:
Di = Xi - Xweighted
(8).
The uncertainty in the difference from the comparison reference value uDi is estimated by
including the following contributions:
a) u(Xlab,i ) the uncertainty of the participant: Given by participant (Appendix C)
b) u(Xweighted) the uncertainty of the reference value with respect to the reference
laboratory: calculated using equation 3.
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c) uref.reprod the reproducibility of the reference laboratory calibration: Calculated using
equation 1 and the detail given in Table1.
d) udrift,i the drift of the artefact used by the participant between initial and final
calibrations by the reference: given for each loop in chapter 4.
e) uinter the uncertainty of interpolation was applied in order to compare all measurement
results at the same nominal value. Given for each loop in chapter 6,
The calculated values of degree of equivalence Di and the expanded uncertainty UDi = 2 uDi
for each participants are given in Appendix D. These values represent the laboratories for
which the deviation from the reference value is larger than its expanded (k=2) uncertainty
(i.e. |Di| / UDi = En >1). The degree of equivalences Di for each participant is reported in
Appendix D
10. Conclusions
The national interlaboratory comparison of electrical hygrometer was performed in two
loops among 14 calibration laboratories in Thailand, with NIMT as reference laboratory
and pilot laboratory. Most of the participating laboratories carried out the comparisons at
7 nominal points of relative humidity (20 %, 30 %, 40 %, 50 %, 60 %, 70 %, and 80 %).
The calibration results of each participant were compared to the reference values of the
reference laboratory to evaluate the measurement capability of the participants. Only three
participants yield their results deviating from the reference values.
In addition, the comparison reference values were calculated by weighting the calibration
results (excepting those from the fail three participants) with the measurement uncertainty.
Finally the obtained comparison reference values are compared to the laboratory values at
each nominal measuring point to evaluate the degree of equivalences for each participant.
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Intercomparison No. HL-01
Page 12 of 22
Appendix A
List of participant laboratories
Loop 1
Organization
National Institute of
Metrology (Thailand)
Name of contact
Mrs. Thasorn Sinhaneti
Instrument
Calibration Center,
EGAT
Mr. Pasit Sagganayok
GPO
Ms.Wipapun Tatiyarat
P.R. Technology and
Calibration Ltd.,Part.
Mr.Pornsak
Anuchartibud
National Institute of
Metrology (Thailand)
Mrs. Thasorn Sinhaneti
Thailand Institute of
Scientific and
Technology Research
(TISTR)
Ms. Karnjanaporn
Amattirat
Sangchai Meter
Calibration
Laboratory
Mr. Supachai Klangsin
Department of
Science Service
Mr. Prawit
Chongnimitstaporn
National Institute of
Metrology (Thailand)
Mrs. Thasorn Sinhaneti
Last Updated : 15/4/20
Address
3/4-5 Moo3, Klong 5,
Klong Luang, Pathumthani
uthai@nimt.or.th
thasorn@nimt.or.th
Tel. 0-2577-5100 Ext.
1307
Fax. 0-2577-5092
53 Jaransanit wong Rd.
Bankkrui, Nonthaburi
Tel. 0-2436-6542
Fax. 0-2436-6297
75/1 Rama6 Rd.,
Ratchattewi, Bangkok
10400
Tel. 0-2203-8685
Fax. 0-2203-8689
9/380 Moo4, Ramintra
Rd., Anusaowaree,
Bangken, Bangkok 10220
Tel. 0-2522-1329
Fax. 0-2522-1381
3/4-5 Moo3, Klong 5,
Klong Luang, Pathumthani
uthai@nimt.or.th
thasorn@nimt.or.th
Tel. 0-2577-5100 Ext.
1307
Fax. 0-2577-5092
Soi 1, Bangpoo Indurtrial
Estate, Sukhumvit Rd.,
Ampohoe Muang,
Samutprakan
Tel. 02323-1672
Fax. 0-2323-9165
694/23-26 Phaholyothin
Rd., Samsen Nai,
Phayathai, Bangkok
Tel. 0-2616-8051 Ext.5503
Fax. 0-2616-8051 Ext.
5501
74/7 RamaIV Rd.,
Rajthevi, Bangkok, 10400
Tel. 0-2201-7128
Fax. 0-2201-7127
3/4-5 Moo3, Klong 5,
Klong Luang, Pathumthani
uthai@nimt.or.th
thasorn@nimt.or.th
Tel. 0-2577-5100 Ext.
1307
Fax. 0-2577-5092
Schedule
2 Feb. 09
23 Feb. 09
16 Mar. 09
7 Apr. 09
4 May 09
25 May 09
15 June 09
27 July 09
Intercomparison No. HL-01
Page 13 of 22
Loop 2
Organization
National Institute of
Metrology (Thailand)
Name of contact
Mrs. Thasorn Sinhaneti
N.M. Technical
Center Laboratory
Mr. Wallop
Mahatananchai
Inter Temp Service &
Supply Co., Ltd.
Mr.Pornsak
Anuchartibud
Technology
Promotion
Association
(Thailand-Japan)
Mrs. Pornthippa
Tameyakul
National Institute of
Metrology (Thailand)
Mrs. Thasorn Sinhaneti
Thai Airways
International Plc
Mr. Sumnouw
Thorngmum
Center on Industrial
Instrument
Calibration
Ms. Uraiwan Petlum
SPC Calibration
Center Co., Ltd
Mr. Thongchan Kamsiri
National Institute of
Metrology (Thailand)
Mrs. Thasorn Sinhaneti
Last Updated : 15/4/20
Address
3/4-5 Moo3, Klong 5,
Klong Luang, Pathumthani
uthai@nimt.or.th
thasorn@nimt.or.th
Tel. 0-2577-5100 Ext.
1307
Fax. 0-2577-5092
12 Soi Luanjan-Anusorn
II, Sukhumvit Rd., Bangna,
Bangkok 10260
Tel. 0-2745-1600
Fax. 0-2745-2801
No. 11 Klongsontongnoon, Moo 4, Ladkrabang,
Bangkok 10520
Tel. 0-2557-1073
Fax. 0-2557-1074
534/4 Soi Pattanakarn 18,
Pattanakarn Rd.,
Suanluang, Suanluang ,
Bangkok 10250
Tel. 0-2717-3000
Fax. 0-2719-9484
3/4-5 Moo3, Klong 5,
Klong Luang, Pathumthani
uthai@nimt.or.th
thasorn@nimt.or.th
Tel. 0-2577-5100 Ext.
1307
Fax. 0-2577-5092
Donmuang International
Airport
Bangkok 10210
Tel. 0-2563-8851
Fax. 0-2563-9183
91 Moo1, Bangmod,
Thonsun, Bangkok 10140
Tel. 0-2872-5281-2
Fax. 0-2872-5283
1194 Soi
Wachirathamsathit 57,
Sukhumvit 101/1,
Bangchak, Prakhanong,
Bangkok 10260
Tel. 0-2185-4333
Fax. 0-2185-4424
3/4-5 Moo3, Klong 5,
Klong Luang, Pathumthani
uthai@nimt.or.th
thasorn@nimt.or.th
Tel. 0-2577-5100 Ext.
1307
Fax. 0-2577-5092
Schedule
2 Feb. 09
23 Feb. 09
16 Mar. 09
7 Apr. 09
4 May 09
25 May 09
6 July 09
6 July 09
Intercomparison No. HL-01
Page 14 of 22
Organization
Thai Calibration
Service
Name of contact
Mr. Somwang
Wongduan
Calibration
Laboratory Co.,Ltd.
Mr. Thanapoom
Hmeethong
National Institute of
Metrology (Thailand)
Mrs. Thasorn Sinhaneti
Last Updated : 15/4/20
Address
19/8 Moo 9, Soi Raiking,
Sampran, Nakornpatom
73210
Tel. 0-2420-1610
Fax. 0-2420-1380
99/11 Moo 12, Soi
Raminra 14(Maiyalab),
Ladphrao, Ladphrao,
Bangkok 10230
Tel. 0-2578-0353-4
Fax. 0-2578-2672
3/4-5 Moo3, Klong 5,
Klong Luang, Pathumthani
uthai@nimt.or.th
thasorn@nimt.or.th
Tel. 0-2577-5100 Ext.
1307
Fax. 0-2577-5092
Schedule
17 Aug. 09
7 Sept. 09
28 Sept. 09
Intercomparison No. HL-01
Page 15 of 22
Appendix B
Sequences of participant laboratories
Loop 1 : Electronic Thermo-Hygrometer Comparison, S/N:A72176+A7A935
NIMT
1
2
3
12
11
10
NIMT
NIMT
Loop 2: Electronic Thermo-Hygrometer Comparison, S/N:A72177+A72146
NIMT
7
8
9
6
5
4
NIMT
NIMT
13
14
NIMT
15
Last Updated : 15/4/20
Intercomparison No. HL-01
Page 16 of 22
Appendix C
Summary of measurement Results for Electrical Thermo-Hygrometer
Electronic Thermo-Hygrometer Comparison, S/N:A72176+A7A935
STD
NIMT1st (30/1/09)
Result after
Artifact
fixed result
Fitting
Equation
H01
Uncertainty
STD
Artifact
fixed result
Result after
Fitting
Equation
Uncertainty
%rh
%rh
%rh
%rh
%rh
%rh
%rh
%rh
%rh
%rh
20.01
20.18
20.00
20.32
0.19
20.00
19.74
20.00
19.91
1.90
30.00
29.94
30.00
29.89
0.22
30.01
29.52
30.00
29.32
1.90
40.00
39.55
40.00
39.46
0.27
40.06
38.73
40.00
38.73
1.90
50.00
49.16
50.00
49.03
0.33
50.03
48.36
50.00
48.14
1.90
60.01
58.58
60.00
58.60
0.41
60.03
57.43
60.00
57.55
1.90
70.01
68.13
70.00
68.17
0.50
70.03
67.00
70.00
66.96
2.10
80.01
77.71
H02
80.00
77.74
Result after
Fitting
Equation
0.60
79.98
76.32
80.00 H03
76.36
2.10
STD
Artifact
fixed result
Uncertainty
%rh
%rh
%rh
%rh
%rh
-
-
-
-
-
30.35
29.61
30.00
29.27
0.94
40.03
38.56
40.00
38.51
0.94
50.01
47.78
50.00
47.75
1.70
60.01
56.94
60.00
56.99
1.70
70.02
66.13
70.00
66.23
2.50
80.00
75.57
NIM T 80.00
2nd (29/4/09) 75.46
2.50
STD
Artifact
fixed result
Result after
Fitting
Equation
%rh
%rh
%rh
%rh
%rh
-
-
-
-
-
29.55
30.22
30.00
30.68
1.09
39.62
39.48
40.00
40.11
1.09
49.64
49.41
50.00
49.54
1.52
60.02
59.26
60.00
58.97
1.52
70.07
68.49
70.00
68.40
1.52
81.20
78.75
80.00
77.83
1.52
H10
fixed result
Result after
Fitting
Equation
Uncertainty
STD
Artifact
fixed result
Result after
Fitting
Equation
%rh
%rh
%rh
%rh
%rh
%rh
%rh
%rh
%rh
%rh
20.00
20.59
20.00
20.69
0.15
-
-
-
-
-
30.01
30.30
30.00
30.29
0.18
30.00
29.17
30.00
28.74
2.00
40.01
39.91
40.00
39.89
0.24
40.00
37.48
40.00
38.47
2.00
50.00
49.58
50.00
49.50
0.31
50.00
48.77
50.00
48.19
2.00
60.00
59.23
60.00
59.10
0.39
60.00
57.63
60.00
57.92
2.00
70.00
68.74
70.00
68.71
0.48
70.00
68.33
70.00
67.65
2.00
Last Updated
80.00 : 15/4/20
78.16
80.00
78.31
0.59
80.00
76.98
80.00
77.38
2.00
Uncertainty
STD
Artifact
Uncertainty
Intercomparison No. HL-01
Page 17 of 22
H11
H12
STD
Artifact
fixed result
Result after
Fitting
Equation
Uncertainty
STD
Artifact
fixed result
Result after
Fitting
Equation
Uncertainty
%rh
%rh
%rh
%rh
%rh
%rh
%rh
%rh
%rh
%rh
20.07
19.61
20.00
19.68
1.40
20.00
20.61
20.00
20.76
1.50
29.98
29.50
30.00
29.57
1.40
30.00
30.25
30.00
30.31
1.50
39.99
39.58
40.00
39.46
1.40
40.00
39.92
40.00
39.85
1.50
49.97
49.54
50.00
49.35
1.40
50.00
49.60
50.00
49.40
1.50
60.11
59.28
60.00
59.24
1.40
60.00
59.12
60.00
58.94
1.50
69.91
69.01
70.00
69.13
1.40
70.00
68.50
70.00
68.49
1.50
79.98
78.92
80.00
79.02
1.40
80.00
77.80
80.00
78.03
1.50
NIMT 3rd (21/7/09)
Last Updated : 15/4/20
STD
Artifact
fixed result
Result after
Fitting
Equation
Uncertainty
%rh
%rh
%rh
%rh
%rh
20.01
20.73
20.00
20.99
0.16
30.00
30.52
30.00
30.59
0.18
40.00
40.33
40.00
40.19
0.24
50.00
50.11
50.00
49.80
0.31
60.01
59.64
60.00
59.40
0.39
70.00
68.99
70.00
69.00
0.48
80.00
78.26
80.00
78.60
0.59
Intercomparison No. HL-01
Page 18 of 22
Electronic Thermo-Hygrometer Comparison, S/N:A72177+A72146
STD
NIMT 1st (30/1/09)
Result after
Artifact
fixed result
Fitting
Equation
H07
Uncertainty
STD
Artifact
fixed result
Result after
Fitting
Equation
Uncertainty
%rh
%rh
%rh
%rh
%rh
%rh
%rh
%rh
%rh
%rh
20.01
19.95
20.00
20.06
0.20
-
-
-
-
-
30.01
29.80
30.00
29.80
0.26
30.24
30.10
30.00
30.14
1.30
40.00
39.60
40.00
39.53
0.35
40.01
39.69
40.00
39.91
1.30
50.00
49.39
50.00
49.26
0.43
50.07
50.10
50.00
49.67
1.30
60.01
59.09
60.00
58.99
0.53
60.01
59.94
60.00
59.44
1.50
70.01
68.71
70.00
68.73
0.64
70.10
69.48
70.00
69.20
1.50
80.01
78.35
H08
80.00
78.46
0.76
80.18
78.60
H09
80.00
78.97
1.70
Uncertainty
STD
Artifact
fixed result
Result after
Fitting
Equation
%rh
%rh
%rh
%rh
%rh
%rh
%rh
%rh
%rh
%rh
20.00
19.37
20.00
19.77
2.10
20.00
20.13
20.00
19.95
2.00
30.00
29.62
30.00
29.53
2.10
30.10
29.61
30.00
29.72
1.40
39.90
39.64
40.00
39.28
2.10
40.10
39.41
40.00
39.48
1.40
50.00
49.15
50.00
49.03
2.10
50.10
49.44
50.00
49.25
1.60
60.10
58.79
60.00
58.78
2.10
60.00
58.96
60.00
59.01
1.60
70.20
68.65
70.00
68.53
2.10
70.20
69.41
70.00
68.78
1.60
80.10
78.28 NIM T 2nd
80.00
(29/4/09) 78.29
2.10
80.00
78.26
80.00
H04
78.55
1.60
Uncertainty
STD
Artifact
fixed result
Result after
Fitting
Equation
STD
Artifact
fixed result
Result after
Fitting
Equation
Uncertainty
STD
Artifact
fixed result
Result after
Fitting
Equation
Uncertainty
%rh
%rh
%rh
%rh
%rh
%rh
%rh
%rh
%rh
%rh
20.00
20.42
20.00
20.55
0.19
-
-
-
-
-
30.01
30.25
30.00
30.22
0.24
31.80
32.31
30.00
30.71
2.00
40.01
39.96
40.00
39.90
0.33
40.30
41.29
40.00
40.94
2.00
50.00
49.68
50.00
49.58
0.42
49.50
50.89
50.00
51.16
2.00
60.00
59.37
60.00
59.25
0.53
60.00
61.49
60.00
61.39
2.00
70.00
68.93
70.00
68.93
0.64
70.30
71.94
70.00
71.61
2.00
80.00
78.47
80.00
78.61
0.76
80.50
82.17
80.00
81.84
2.00
Last Updated : 15/4/20
Intercomparison No. HL-01
Page 19 of 22
H16
H05
STD
Artifact
fixed result
Result after
Fit Equation
Uncertainty
%rh
%rh
%rh
%rh
%rh
-
-
-
-
-
29.70
29.83
30.00
29.86
2.30
40.10
39.60
40.00
39.26
2.30
50.00
48.10
50.00
48.66
2.30
60.10
57.80
60.00
58.06
2.50
2.00
70.30
67.92
70.00
67.47
2.50
68.69
2.00
80.40
77.50
80.00
76.87
2.50
78.70 NIM T 3rd
80.00
(21/7/09) 78.40
2.00
STD
Artifact
fixed result
Result after
Fit Equation
Uncertainty
%rh
%rh
%rh
%rh
%rh
-
-
-
-
-
-
-
-
-
-
40.10
39.51
40.00
39.56
2.00
50.20
49.57
50.00
49.27
2.00
60.20
59.32
60.00
58.98
70.40
69.08
70.00
80.40
H13
STD
Artifact
fixed result
Result after
Fitting
Equation
Uncertainty
STD
Artifact
fixed result
Result after
Fitting
Equation
Uncertainty
%rh
%rh
%rh
%rh
%rh
%rh
%rh
%rh
%rh
%rh
20.01
20.18
20.00
20.41
0.18
-
-
-
-
-
30.01
30.13
30.00
30.16
0.24
30.08
30.19
30.00
30.47
1.11
40.01
40.08
40.00
39.90
0.33
39.97
40.34
40.00
40.12
1.11
50.00
49.85
50.00
49.65
0.42
50.04
49.75
50.00
49.77
1.11
60.00
59.56
60.00
59.39
0.53
59.94
59.81
60.00
59.42
1.11
70.00
69.15
70.00
69.14
0.64
69.97
69.13
70.00
69.07
1.11
80.01
78.63
80.00
H14
78.89
0.42
79.97
78.34
80.00
NIM T 4th (1/10/09)
78.72
1.11
STD
Artifact
fixed result
Result after
Fitting
Equation
Uncertainty
STD
Artifact
fixed result
Result after
Fitting
Equation
Uncertainty
%rh
%rh
%rh
%rh
%rh
%rh
%rh
%rh
%rh
%rh
-
-
-
-
-
20.01
20.26
20.00
20.46
0.16
30.12
32.10
30.00
32.63
1.10
30.01
30.14
30.00
30.13
0.24
40.06
42.11
40.00
42.03
1.10
40.01
39.96
40.00
39.81
0.33
50.05
52.08
50.00
51.43
1.10
50.01
49.67
50.00
49.48
0.43
60.03
61.55
60.00
60.83
1.40
60.00
59.22
60.00
59.15
0.53
70.02
70.20
70.00
70.23
1.40
70.00
68.79
70.00
68.83
0.64
80.01
79.01
80.00
79.62
1.40
80.00
78.35
80.00
78.50
0.77
Last Updated : 15/4/20
Intercomparison No. HL-01
Last Updated : 15/4/20
Page 20 of 22
Intercomparison No. HL-01
Page 21 of 22
Appendix D
Summary of result analysis was calculated by 1st order polynomial equation.
Electronic Thermo-Hygrometer Comparison, S/N:A72176+A7A935
Participants 20.0
Di
UDi
En 30.00 Di
UDi
En 40.0
Di
UDi
En 50.0
Di
UDi
En 60.0
Di
UDi
En 70.0
Di
UDi
En 80.0
Di
UDi
En
NIMT
20.32 -0.37 0.54 0.69 29.89 -0.38 0.47 0.81 39.46 -0.40 0.54 0.75 49.03 -0.41 0.61 0.66 58.60 -0.42 0.63 0.66 68.17 -0.44 0.71 0.62 77.74 -0.47 0.80 0.59
H01
19.91 -0.77 1.97 0.39 29.32 -0.95 1.98 0.48 38.73 -1.13 1.95 0.58 48.14 -1.30 1.99 0.65 57.55 -1.47 1.98 0.74 66.96 -1.66 2.16 0.77 76.36 -1.85 2.16 0.85
H02
-
-
-
-
29.27 -1.00 1.03 0.97 38.51 -1.35 1.03 1.31 47.75 -1.69 1.76 0.96 56.99 -2.03 1.77 1.15 66.23 -2.39 2.56 0.93 75.46 -2.75 2.56 1.07
H03
-
-
-
-
30.68 0.41 1.17 0.35 40.11 0.24 1.29 0.19 49.54 0.10 1.64 0.06 58.97 -0.05 1.68 0.03 68.40 -0.21 1.60 0.13 77.83 -0.38 1.66 0.23
NIMT
H10
20.69 0.00 0.48 0.00 30.29 0.02 0.45 0.04 39.89 0.03 0.49 0.06 49.50 0.06 0.57 0.11 59.10 0.08 0.67 0.13 68.71 0.09 0.69 0.13 78.31 0.10 0.84 0.12
-
-
-
-
28.74 -1.53 2.22 0.69 38.47 -1.40 2.84 0.49 48.19 -1.24 2.35 0.53 57.92 -1.10 2.14 0.51 67.65 -0.97 2.47 0.39 77.38 -0.84 2.21 0.38
H11
19.68 -1.01 1.48 0.68 29.57 -0.70 1.46 0.48 39.46 -0.40 1.49 0.27 49.35 -0.09 1.54 0.06 59.24 0.22 1.48 0.15 69.13 0.52 1.49 0.35 79.02 0.81 1.50 0.54
H12
20.76 0.08 1.59 0.05 30.31 0.04 1.56 0.02 39.85 -0.01 1.57 0.01 49.40 -0.04 1.62 0.02 58.94 -0.07 1.61 0.05 68.49 -0.13 1.58 0.08 78.03 -0.18 1.65 0.11
NIMT
20.99 0.30 0.69 0.43 30.59 0.32 0.47 0.68 40.19 0.33 0.56 0.59 49.80 0.36 0.83 0.43 59.40 0.38 0.76 0.50 69.00 0.39 0.69 0.56 78.60 0.39 1.04 0.38
Last Updated : 15/4/20
Intercomparison No. HL-01
Page 22 of 22
Electronic Thermo-Hygrometer Comparison, S/N:A72177+A72146
Participants
NIMT
H07
20.0
Di
UDi
En 30.00 Di
UDi
En
40.0
Di
UDi
En
50.0
Di
UDi
En
60.0
Di
UDi
En
70.0
Di
UDi
En
80.0
Di
UDi
En
20.06 -0.26 0.45 0.60 29.80 -0.30 0.33 0.90 39.53 -0.3 0.41 0.66 49.26 -0.23 0.52 0.44 58.99 -0.19 0.57 0.33 68.73 -0.17 0.65 0.25 78.46 -0.15 0.81 0.18
-
-
- 2.27 0.24
30.14 0.05 1.43 0.03 39.91 0.1 1.39 0.08 49.67 0.18 1.50 0.12 59.44 0.25 1.80 0.14 69.20 0.31 1.55 0.20 78.97 0.36 2.02 0.18
H08
19.77 -0.55
29.53 -0.57 2.12 0.27 39.28 -0.5 2.30 0.23 49.03 -0.46 2.12 0.22 58.78 -0.40 2.11 0.19 68.53 -0.36 2.11 0.17 78.29 -0.32 2.11 0.15
H09
19.95 -0.38 2.06 0.18 29.72 -0.38 1.47 0.26 39.48 -0.3 1.45 0.22 49.25 -0.24 1.62 0.15 59.01 -0.17 1.61 0.11 68.78 -0.12 1.83 0.06 78.55 -0.06 1.70 0.04
NIMT
20.55 0.22 0.46 0.48 30.22 0.13 0.31 0.42 39.90 0.1 0.39 0.26 49.58 0.09 0.49 0.18 59.25 0.07 0.59 0.12 68.93 0.04 0.65 0.06 78.61 0.00 0.82 0.00
H04
-
-
-
-
H05
-
-
-
-
H16
-
-
-
-
29.86 -0.23 2.36 0.10 39.26 -0.5 2.36 0.23 48.66 -0.82 2.57 0.32 58.06 -1.12 2.60 0.43 67.47 -1.43 2.53 0.57 76.87 -1.74 2.55 0.68
NIMT
-
-
-
-
30.16 0.06 0.32 0.20 39.90 0.1 0.50 0.21 49.65 0.16 0.60 0.27 59.39 0.21 0.64 0.33 69.14 0.25 0.66 0.38 78.89 0.28 0.94 0.30
H13
-
-
-
-
30.47 0.38 1.33 0.28 40.12 0.3 1.23 0.26 49.77 0.28 1.13 0.25 59.42 0.24 1.43 0.17 69.07 0.18 1.13 0.16 78.72 0.12 1.32 0.09
H14
-
-
-
-
32.63 2.54 1.71 1.49 42.03 2.2 1.11 2.00 51.43 1.94 1.64 1.19 60.83 1.65 1.98 0.83 70.23 1.33 1.41 0.95 79.62 1.02 1.88 0.54
NIMT
-
-
-
-
30.13 0.04 0.32 0.13 39.81 0.0 0.48 0.02 49.48 -0.01 0.58 0.01 59.15 -0.03 0.57 0.05 68.83 -0.07 0.66 0.10 78.50 -0.11 0.83 0.13
Last Updated : 15/4/20
30.71 0.62 2.07 0.30 40.94 1.1 2.01 0.57 51.16 1.68 2.06 0.81 61.39 2.20 2.01 1.09 71.61 2.72 2.00 1.36 81.84 3.23 2.04 1.59
-
-
-
-
39.56 -0.2 2.03 0.12 49.27 -0.22 2.02 0.11 58.98 -0.20 2.03 0.10 68.69 -0.20 2.00 0.10 78.40 -0.20 2.01 0.10