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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
Items for defining ITS-90 , Temperature : 800 °C to 1600 °C
Radiation thermometer
Absolute expanded uncertainty : 0.24 °C to 0.84 °C
{"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"}}
The expanded uncertainty is expressed in °C
Direct scale realization Measurement of relative spectral responsivity
Wavelength : 0.9 µm
Approved on 28 May 2012
Institute service identifier : NMC, A*STAR/TM032
Items for disseminating ITS-90 and PLTS 2000 , Temperature : -90 °C to 80 °C
Liquid-in-glass thermometer
Absolute expanded uncertainty : 0.5 °C
Partial immersion, 2 °C graduation. Comparison method
Temperature controlled bath : Ultra low temperature bath, alcohol, water bath
Approved on 27 February 2018
Institute service identifier : NMC, A*STAR/TM015
Items for disseminating ITS-90 and PLTS 2000 , Temperature : -75 °C to 80 °C
Liquid-in-glass thermometer
Absolute expanded uncertainty : 1.0E-2 °C
Total immersion, 0.01 °C graduation. Comparison method
Temperature controlled bath : alcohol, water bath
Approved on 16 March 2011
Institute service identifier : NMC, A*STAR/TM015
Items for disseminating ITS-90 and PLTS 2000 , Temperature : 80 °C to 250 °C
Liquid-in-glass thermometer
Absolute expanded uncertainty : 0.15 °C
Total immersion, 0.5 °C graduation. Comparison method
Temperature controlled bath : oil bath
Approved on 16 March 2011
Institute service identifier : NMC, A*STAR/TM016
Items for disseminating ITS-90 and PLTS 2000 , Temperature : 80 °C to 250 °C
Liquid-in-glass thermometer
Absolute expanded uncertainty : 0.3 °C
Total immersion, 1 °C graduation. Comparison method
Temperature controlled bath : oil bath
Approved on 16 March 2011
Institute service identifier : NMC, A*STAR/TM016
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
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
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
Properties of detectors , Responsivity, spectral, irradiance
Broad band detector
Relative expanded uncertainty : 6 %
Transfer standard silicon photodiode, UV source and filter
Wavelength range : 365 nm
Bandwidth : 10 nm
Irradiance level : 150 W/m2 to 3000 W/m2
Approved on 16 January 2011
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 : 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 disseminating ITS-90 and PLTS 2000 , Temperature : -196 °C
IPRT
Absolute expanded uncertainty : 1.6E1 mK
Calibration by comparison at temperature points
Temperature controlled bath : Liquid nitrogen comparator
CMC uncertainty does not include DUT hysteresis
Approved on 27 February 2018
Institute service identifier : NMC, A*STAR/TM059
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

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