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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)
Portugal, IPQ (Instituto Portugues da Qualidade)
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 mmol/mol Relative expanded uncertainty in %
synthetic natural gas carbon dioxide 2 to 40 1.8 to 1.2 2 to 40 1.8 to 1.2
synthetic natural gas ethane 7 to 110 0.5 7 to 110 0.5
synthetic natural gas i-butane 1 to 7 1.5 to 0.7 1 to 7 1.5 to 0.7
synthetic natural gas methane 700 to 900 0.4 to 0.3 700 to 900 0.4 to 0.3
synthetic natural gas n-butane 1 to 7 1.4 to 0.8 1 to 7 1.4 to 0.8
synthetic natural gas nitrogen 12 to 140 0.5 to 0.4 12 to 140 0.5 to 0.4
synthetic natural gas propane 3 to 45 0.7 to 0.4 3 to 45 0.7 to 0.4
  • Mechanism for measurement service delivery : Calibration, CRM, 702.07
  • Approved on 21 October 2001
  • Institute service identifier : 702.07
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 mmol/mol Relative expanded uncertainty in %
nitrogen carbon dioxide 10 to 200 0.3 to 0.2 10 to 200 0.3 to 0.2
  • Mechanism for measurement service delivery : Calibration, CRM
  • Approved on 22 October 2020
  • Institute service identifier : IPQ/702.02
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 mmol/mol Relative expanded uncertainty in %
nitrogen carbon dioxide 60 to 140 0.3 60 to 140 0.3
nitrogen carbon monoxide 5 to 50 0.6 5 to 50 0.6
nitrogen propane 0.1 to 2 0.8 to 0.7 0.1 to 2 0.8 to 0.7
  • Mechanism for measurement service delivery : Calibration, CRM
  • Approved on 22 October 2020
  • Institute service identifier : IPQ/702.03
Matrix or material Analyte or component Dissemination range of measurement capability Range of certified values in reference materials
Amount-of-substance fraction in µmol/mol Relative expanded uncertainty in % Amount-of-substance fraction in µmol/mol Relative expanded uncertainty in %
nitrogen carbon monoxide 100 to 5000 0.6 to 0.5 100 to 5000 0.6 to 0.5
  • Mechanism for measurement service delivery : Calibration, CRM
  • Approved on 22 October 2020
  • Institute service identifier : IPQ/702.01a
Matrix or material Analyte or component Dissemination range of measurement capability Range of certified values in reference materials
Amount-of-substance fraction in µmol/mol Relative expanded uncertainty in % Amount-of-substance fraction in µmol/mol Relative expanded uncertainty in %
nitrogen carbon monoxide 5 to 10 1.6 5 to 10 1.6
  • Mechanism for measurement service delivery : Calibration, CRM
  • Approved on 22 October 2020
  • Institute service identifier : IPQ/702.01c
Matrix or material Analyte or component Dissemination range of measurement capability Range of certified values in reference materials
Amount-of-substance fraction in µmol/mol Relative expanded uncertainty in % Amount-of-substance fraction in µmol/mol Relative expanded uncertainty in %
nitrogen carbon monoxide 10 to 100 1.6 to 0.6 10 to 100 1.6 to 0.6
  • Mechanism for measurement service delivery : Calibration, CRM
  • Approved on 22 October 2020
  • Institute service identifier : IPQ/702.01d
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 mmol/mol Relative expanded uncertainty in %
nitrogen carbon monoxide 5 to 50 0.5 5 to 50 0.5
  • Mechanism for measurement service delivery : Calibration, CRM
  • Approved on 22 October 2020
  • Institute service identifier : IPQ/702.01b
Matrix or material Analyte or component Dissemination range of measurement capability Range of certified values in reference materials
Amount-of-substance fraction in µmol/mol Relative expanded uncertainty in % Amount-of-substance fraction in µmol/mol Relative expanded uncertainty in %
nitrogen ethanol 50 to 500 1.3 to 0.7 50 to 500 1.3 to 0.7
  • Mechanism for measurement service delivery : Calibration, CRM, 702.04
  • Approved on 08 July 2015
  • Institute service identifier : 702.04
Matrix or material Analyte or component Dissemination range of measurement capability Range of certified values in reference materials
Amount-of-substance fraction in µmol/mol Relative expanded uncertainty in % Amount-of-substance fraction in µmol/mol Relative expanded uncertainty in %
nitrogen hydrogen sulfide 5 to 250 0.9 to 0.7 5 to 250 0.9 to 0.7
  • Mechanism for measurement service delivery : Calibration, custom CRMs
  • Approved on 02 November 2006
  • Institute service identifier : 702.11
Matrix or material Analyte or component Dissemination range of measurement capability Range of certified values in reference materials
Amount-of-substance fraction in µmol/mol Relative expanded uncertainty in % Amount-of-substance fraction in µmol/mol Relative expanded uncertainty in %
nitrogen nitrogen monoxide 150 to 1000 0.5 to 0.4 150 to 1000 0.5 to 0.4
  • Mechanism for measurement service delivery : Analyser and CRM Calibration
  • Approved on 27 March 2013
  • Institute service identifier : 702.06a
Matrix or material Analyte or component Dissemination range of measurement capability Range of certified values in reference materials
Amount-of-substance fraction in µmol/mol Relative expanded uncertainty in % Amount-of-substance fraction in µmol/mol Relative expanded uncertainty in %
nitrogen propane 50 to 1000 2 to 1.7 50 to 1000 2 to 1.7
  • Mechanism for measurement service delivery : Calibration, CRM
  • Approved on 22 October 2020
  • Institute service identifier : IPQ/702.08a
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 mmol/mol Relative expanded uncertainty in %
nitrogen propane 1 to 4 1.7 1 to 4 1.7
  • Mechanism for measurement service delivery : Calibration, CRM
  • Approved on 22 October 2020
  • Institute service identifier : IPQ/702.08b
Matrix or material Analyte or component Dissemination range of measurement capability Range of certified values in reference materials
Amount-of-substance fraction in µmol/mol Relative expanded uncertainty in % Amount-of-substance fraction in µmol/mol Relative expanded uncertainty in %
nitrogen sulfur dioxide 20 to 1000 1.6 to 0.6 20 to 1000 1.6 to 0.6
  • Mechanism for measurement service delivery : Calibration CRM
  • Approved on 22 October 2020
  • Institute service identifier : IPQ/702.05
Items for defining ITS-90 , Temperature : -38 °C to 30 °C
Standard Platinum Resistance Thermometer (SPRT)
Absolute expanded uncertainty : 1.0E-3 °C
Calibration at fixed points
Ambient temperature : 20 °C
Approved on 17 January 2013
Institute service identifier : IPQ/501.20
Items for disseminating ITS-90 and PLTS 2000 , Temperature : 200 °C to 300 °C
Liquid-in-glass thermometer
Absolute expanded uncertainty : 0.1 °C
Comparison at stirred liquid bath
Ambient temperature : 20 °C
Approved on 03 November 2009
Institute service identifier : IPQ/501.50
Items for defining ITS-90 , Temperature : 0 °C to 660 °C
SPRT and long-stem HTSPRTs
Absolute expanded uncertainty : 1.0E-2 °C
Calibration at fixed points
Ambient temperature : 20 °C
Approved on 17 January 2013
Institute service identifier : IPQ/501.20
Viscosity , Kinematic viscosity : 65 mm2/s to 1800 mm2/s
Newtonian liquids
Relative expanded uncertainty : 0.5 %
Reference liquid
Temperature : 20 °C
The uncertainty of the viscosity of water (ISO/TR 3666 (1998), 0.17%) is not taken into account
Approved on 11 October 2005
Pressure , Gauge pressure : 2.00E5 Pa to 1.00E7 Pa
Pressure balances
Absolute expanded uncertainty
[(272 + (5.8E-05p)2]1/2

p pressure in Pa

The uncertainty is expressed in Pa

Oil medium
Uncertainty values range from 2.9E+01 Pa to 5.8E+02 Pa
Approved on 17 September 2010
Institute service identifier : IPQ/245.00
Pressure , Gauge pressure : 1.00E7 Pa to 1.00E8 Pa
Pressure balances
Absolute expanded uncertainty
5.5E-05p

p pressure in Pa

The uncertainty is expressed in Pa

Oil medium
Uncertainty values range from 5.5E+02 Pa to 5.5E+03 Pa
Approved on 11 October 2005
Institute service identifier : IPQ/245.00
Pressure , Gauge pressure : 3500 Pa to 1.70E5 Pa
Pressure balances
Absolute expanded uncertainty
3.0E-05p

p pressure in Pa

The uncertainty is expressed in Pa

Gas medium
Uncertainty values range from 1.1E-01 Pa to 5.1 Pa
Approved on 11 October 2005
Institute service identifier : IPQ/245.00

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