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In the CMCs uncertainty statements, the notation Q[a, b] stands for the root-sum-square of the terms between brackets: Q[a, b] = [a 2 + b 2]1/2
Unless otherwise stated the expanded uncertainties given below correspond to k = 2 (at a 95 % level of confidence)
Singapore, NMC, A*STAR (National Metrology Centre, Agency for Science, Technology and Research)
| Matrix or material |
Analyte or component |
Dissemination range of measurement capability |
Range of certified values in reference materials |
| Amount-of-substance fraction in mmol/mol |
Relative expanded uncertainty in % |
Amount-of-substance fraction in |
|
| nitrogen |
carbon dioxide |
10 to 200 |
0.25 |
|
|
-
Mechanism for measurement service delivery :
Calibration service
-
Approved on
08 July 2020
-
Institute service identifier : NMC-A*STAR/4.2.1
| Matrix or material |
Analyte or component |
Dissemination range of measurement capability |
Range of certified values in reference materials |
| Amount-of-substance fraction in mmol/mol |
Relative expanded uncertainty in % |
Amount-of-substance fraction in |
|
| nitrogen |
methane |
0.5 to 500 |
0.4 |
|
|
-
Mechanism for measurement service delivery :
Calibration service
-
Approved on
08 July 2020
-
Institute service identifier : NMC-A*STAR/4.2.4
| Matrix or material |
Analyte or component |
Dissemination range of measurement capability |
Range of certified values in reference materials |
| Amount-of-substance fraction in mmol/mol |
Relative expanded uncertainty in % |
Amount-of-substance fraction in |
|
| nitrogen |
oxygen |
50 to 300 |
0.25 |
|
|
-
Mechanism for measurement service delivery :
Calibration service
-
Approved on
08 July 2020
-
Institute service identifier : NMC-A*STAR/4.2.2
| Matrix or material |
Analyte or component |
Dissemination range of measurement capability |
Range of certified values in reference materials |
| Amount-of-substance fraction in mmol/mol |
Relative expanded uncertainty in % |
Amount-of-substance fraction in |
|
| nitrogen |
propane |
0.01 to 500 |
0.5 |
|
|
-
Mechanism for measurement service delivery :
Calibration service
-
Approved on
08 July 2020
-
Institute service identifier : NMC-A*STAR/4.2.3
Spectral properties of materials ,
Transmittance, regular, spectral
:
1.00E-3 to 1
Spectrally-neutral material
Relative expanded uncertainty
:
1.5 % to 0.5 %
Scanning spectrometer
Wavelength range : 350 nm to 860 nm
Bandwidth : 1 nm to 5 nm
Specific measurement conditions : normal incidence
Approved on 16 January 2011
Items for defining ITS-90 ,
Temperature
:
29.7646 °C
SPRT
Absolute expanded uncertainty
:
0.65 mK
Gallium melting point cell
Temperature controlled furnace
Approved on 27 February 2018
Institute service identifier : NMC, A*STAR/TM050
Items for defining ITS-90 ,
Temperature
:
660.323 °C
SPRT
Absolute expanded uncertainty
:
6 mK
Aluminum freezing point cell
Temperature controlled furnace
Approved on 09 February 2015
Institute service identifier : NMC, A*STAR/TM047
Items for defining ITS-90 ,
Temperature
:
-189.3442 °C
SPRT
Absolute expanded uncertainty
:
0.77 mK
Argon triple point cell
Temperature controlled Dewar
Approved on 27 February 2018
Institute service identifier : NMC, A*STAR/TM048
Items for defining ITS-90 ,
Temperature
:
419.527 °C
SPRT
Absolute expanded uncertainty
:
2.2 mK
Zinc freezing point cell
Temperature controlled furnace
Approved on 27 February 2018
Institute service identifier : NMC, A*STAR/TM053
Items for defining ITS-90 ,
Temperature
:
-189.3442 °C to 0.01 °C
SPRT
Absolute expanded uncertainty
:
1 mK
W4 (Ar-Hg-TPW)
Temperature controlled Bath
Approved on 27 February 2018
Institute service identifier : NMC, A*STAR/TM055
Items for defining ITS-90 ,
Temperature
:
29.7646 °C
Gallium melting point cell
Absolute expanded uncertainty
:
0.4 mK
Comparison with reference cell(s)
Temperature controlled furnace
Approved on 09 February 2015
Items for defining ITS-90 ,
Temperature
:
419.527 °C
Zinc freezing point cell
Absolute expanded uncertainty
:
1 mK
Comparison with reference cell(s)
Temperature controlled furnace
Approved on 09 February 2015
Items for defining ITS-90 ,
Temperature
:
800 °C to 1600 °C
Radiation thermometer
Absolute expanded uncertainty
:
0.24 °C to 0.84 °C
Uncertainty table
{"row_1":{"col_1":"","col_2":"0.9 µm"},"row_2":{"col_1":"800 °C","col_2":"0.24"},"row_3":{"col_1":"900 °C","col_2":"0.32"},"row_4":{"col_1":"1000 °C","col_2":"0.40"},"row_5":{"col_1":"1100 °C","col_2":"0.46"},"row_6":{"col_1":"1200 °C","col_2":"0.52"},"row_7":{"col_1":"1300 °C","col_2":"0.59"},"row_8":{"col_1":"1400 °C","col_2":"0.66"},"row_9":{"col_1":"1500 °C","col_2":"0.75"},"row_10":{"col_1":"1600 °C","col_2":"0.84"}}
Direct scale realization Measurement of relative spectral responsivity
Wavelength : 0.9 µm
Approved on 28 May 2012
Institute service identifier : NMC, A*STAR/TM032
Hygrometers ,
Relative humidity
:
10 %rh to 95 %rh
RH sensors
Absolute expanded uncertainty
0.0064RH+0.35 RH relative humidity in %rh
The uncertainty is expressed in %rh
Comparison
Temperature : 0 °C to 30°C
Pressure : ambient
Approved on 20 April 2017
Institute service identifier : NMC, A*STAR/TM48
Items for disseminating ITS-90 and PLTS 2000 ,
Temperature
:
960 °C to 1400 °C
Disappearing filament pyrometer
Absolute expanded uncertainty
:
4 °C
Calibration by reference strip lamp
Approved on 28 May 2012
Institute service identifier : NMC, A*STAR/TM045
Hygrometers ,
Dew-point temperature
:
-60 °C to -50 °C
Dew-point hygrometer
Absolute expanded uncertainty
:
0.13 °C to 0.1 °C
Comparison
Pressure : ambient
Approved on 28 June 2007
Angle ,
Angle instruments
:
0 ' to 30 '
Autocollimator: error of indicated angle
Absolute expanded uncertainty
:
0.4 "
Small angle generator
Approved on 10 April 2018
Institute service identifier : NMC, A*STAR/LS/AG/002
Hardness ,
Hardness
:
20 HRA to 88 HRA
Hardness Block
Absolute expanded uncertainty
:
0.3 HRA
Rockwell, direct measurement
Total test force : 0.59 kN
Approved on 21 October 2001
Institute service identifier : NMC, A*STAR/20
Mass ,
Mass
:
2 mg
Mass standard
Absolute expanded uncertainty
:
1.6 µg
Comparison in air
Approved on 27 June 2019
Institute service identifier : NMC, A*STAR/1b
Fibre optics ,
Wavelength
:
1520 nm to 1620 nm
Optical spectrum analyser
Absolute expanded uncertainty
:
2.0E-2 nm
Tunable laser source and wavelength meter
Optical power : -30 dBm to +3 dBm
Approved on 16 January 2011
