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General physics
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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)
Colombia, INM (CO) (Instituto Nacional de Metrología de Colombia)
Matrix or material Dissemination range of measurement capability Range of certified values in reference materials
Electrolytic conductivity in S/m Absolute expanded uncertainty in S/m Electrolytic conductivity in S/m Absolute expanded uncertainty in S/m
aqueous solution 0.15 to 0.5 8.0E-4 to 1.0E-3 0.15 to 0.5 8.0E-4 to 1.0E-3
  • Mechanism for measurement service delivery : INM-002-04
  • Data given to 25°C
  • Approved on 23 October 2019
  • Institute service identifier : INM-002-04
  • KCDB ID : SIM-QM-CO-00000JWK-1
Matrix or material Dissemination range of measurement capability Range of certified values in reference materials
pH in Absolute expanded uncertainty in pH in Absolute expanded uncertainty in
aqueous pH buffer 9.5 to 10.5 5.9E-2 9.5 to 10.5 5.9E-2
  • Mechanism for measurement service delivery : INM-001-04
  • Data given to 25°C. Declared uncertainties do not include the uncertainty contribution due to the Bates-Guggenheim convention.
  • Approved on 23 October 2019
  • Institute service identifier : INM-001-04
  • KCDB ID : SIM-QM-CO-00000JWG-1
Matrix or material Dissemination range of measurement capability Range of certified values in reference materials
pH in Absolute expanded uncertainty in pH in Absolute expanded uncertainty in
aqueous pH buffer 9.1 to 9.3 3.5E-2 9.1 to 9.3 3.5E-2
  • Mechanism for measurement service delivery : INM-001-03
  • Data given to 25°C. Declared uncertainties do not include the uncertainty contribution due to the Bates-Guggenheim convention.
  • Approved on 23 October 2019
  • Institute service identifier : INM-001-03
  • KCDB ID : SIM-QM-CO-00000JWF-1
Matrix or material Dissemination range of measurement capability Range of certified values in reference materials
Electrolytic conductivity in µS/cm Absolute expanded uncertainty in µS/cm Electrolytic conductivity in µS/cm Absolute expanded uncertainty in µS/cm
aqueous solution 200 1.1 200 1.1
  • Mechanism for measurement service delivery : INM-002-01
  • Data given at 25°C
  • Approved on 15 July 2017
  • Institute service identifier : INM-002-01
  • KCDB ID : SIM-QM-CO-000001IK-1
Matrix or material Dissemination range of measurement capability Range of certified values in reference materials
pH in Absolute expanded uncertainty in pH in Absolute expanded uncertainty in
aqueous pH buffer 6.7 to 7 9.0E-3 6.7 to 7 9.0E-3
  • Mechanism for measurement service delivery : INM-001-01
  • Data given to 25°C. Declared uncertainties do not include the uncertainty contribution due to the Bates-Guggenheim convention.
  • Approved on 23 October 2019
  • Institute service identifier : INM-001-01
  • KCDB ID : SIM-QM-CO-00000JWE-1
Matrix or material Dissemination range of measurement capability Range of certified values in reference materials
Electrolytic conductivity in µS/cm Absolute expanded uncertainty in µS/cm Electrolytic conductivity in µS/cm Absolute expanded uncertainty in µS/cm
aqueous solution 1000 3.3 1000 3.3
  • Mechanism for measurement service delivery : INM-002-03
  • Data given to 25°C
  • Approved on 15 July 2017
  • Institute service identifier : INM-002-03
  • KCDB ID : SIM-QM-CO-000001IM-1
Matrix or material Dissemination range of measurement capability Range of certified values in reference materials
Electrolytic conductivity in µS/cm Absolute expanded uncertainty in µS/cm Electrolytic conductivity in µS/cm Absolute expanded uncertainty in µS/cm
aqueous solution 500 1.7 500 1.7
  • Mechanism for measurement service delivery : INM-002-02
  • Data given to 25°C
  • Approved on 15 July 2017
  • Institute service identifier : INM-002-02
  • KCDB ID : SIM-QM-CO-000001IL-1
Matrix or material Dissemination range of measurement capability Range of certified values in reference materials
pH in Absolute expanded uncertainty in pH in Absolute expanded uncertainty in
aqueous pH buffer 4 to 4.2 7.0E-3 to 9.0E-3 4 to 4.2 7.0E-3 to 9.0E-3
  • Mechanism for measurement service delivery : INM-001-02
  • Data given to 25°C. Declared uncertainties do not include the uncertainty contribution due to the Bates-Guggenheim convention.
  • Approved on 15 July 2017
  • Institute service identifier : INM-001-02
  • KCDB ID : SIM-QM-CO-000001CK-1
Matrix or material Dissemination range of measurement capability Range of certified values in reference materials
Electrolytic conductivity in mS/m Absolute expanded uncertainty in mS/m Electrolytic conductivity in mS/m Absolute expanded uncertainty in mS/m
aqueous solution 5 to 14.3 0.1 to 0.29 5 to 14.3 0.1 to 0.29
  • Mechanism for measurement service delivery : INM-002-05
  • Data given to 25°C
  • Approved on 23 October 2019
  • Institute service identifier : INM-002-05
  • KCDB ID : SIM-QM-CO-00000JWJ-1
Matrix or material Analyte or component Dissemination range of measurement capability Range of certified values in reference materials
Mass fraction in mg/kg Absolute expanded uncertainty in mg/kg Mass fraction in mg/kg Absolute expanded uncertainty in mg/kg
fresh water calcium 8.16 to 28.5 0.25 to 0.33 8.2 to 28 0.3 to 0.63
fresh water iron 1.06 to 1000 0.1 to 2.8E1 36.5 to 1000 2.4 to 6.9E1
fresh water magnesium 1.91 to 14.2 6.0E-2 to 0.11 1.95 to 7.38 7.6E-2 to 0.18
fresh water nickel 0.44 to 50 5.5E-2 to 0.88 15.5 to 25 0.98 to 1.6
fresh water potassium 1.91 to 5 6.0E-2 to 0.2 1.91 to 5 6.6E-2 to 0.21
fresh water sodium 3 to 18.6 7.0E-2 to 0.28 3 to 18.6 0.13 to 0.75
fresh water zinc 1.06 to 800 0.1 to 1.0E1 55 to 800 2.9 to 4.2E1
  • Mechanism for measurement service delivery : CRM provider by elements in fresh water code INM-011-01 Lot 201110
  • source of traceability SRM 3109a (Lot No. 130213)
  • Approved on 01 September 2023
  • Institute service identifier : INM-011-01
  • KCDB ID : SIM-QM-CO-00000O21-1
Hygrometers , Humidity : 12 %rh to 85 %rh
Relative humidity (capacitive hygrometer)
Absolute expanded uncertainty : 1.7 %rh to 2.5 %rh
Chilled mirror hygrometer, and two pressure humidity generator
Continuous gas flow : maximum 10 l/min
Test chamber temperature : 20 °C ± 0.2 °C
Atmospheric pressure : 751 hPa ± 10 hPa
Room temperature : 21 °C ± 2 °C
Relative humidity : 50 %RH ± 15 %RH
Approved on 23 October 2015
Institute service identifier : INM-L02-39
KCDB ID : SIM-T-CO-00000757-1
Items for disseminating ITS-90 and PLTS 2000 , Temperature : 80 °C to 150 °C
Liquid-in-glass thermometer: 0.1 °C graduation, total immersion, Mercury
Absolute expanded uncertainty : 5.4E-2 °C
Comparison in stirred liquid bath
Temperature : 21 °C ± 2 °C
Relative humidity : 50 %RH ± 15 %RH
Approved on 23 October 2015
Institute service identifier : INM-L02-25
KCDB ID : SIM-T-CO-0000074T-1
Items for disseminating ITS-90 and PLTS 2000 , Temperature : 80 °C to 150 °C
Liquid-in-glass thermometer: 1 °C graduation, total immersion, Mercury
Absolute expanded uncertainty : 0.17 °C
Comparison in stirred liquid bath
Temperature : 21 °C ± 2 °C
Relative humidity : 50 %RH ± 15 %RH
Approved on 23 October 2015
Institute service identifier : INM-L02-28
KCDB ID : SIM-T-CO-0000074W-1
Items for disseminating ITS-90 and PLTS 2000 , Temperature : -80 °C to 0 °C
Digital system thermometer (PRT sensor)
Absolute expanded uncertainty : 7.2E-2 °C
Comparison in stirred ethanol bath
Temperature : 21 °C ± 2 °C
Relative humidity : 50 %RH ± 15 %RH
Approved on 23 October 2015
Institute service identifier : INM-L02-32
KCDB ID : SIM-T-CO-00000750-1
Items for disseminating ITS-90 and PLTS 2000 , Temperature : 5 °C to 80 °C
Liquid-in-glass thermometer: 0.2 °C graduation
Absolute expanded uncertainty : 4.8E-2 °C
Comparison in stirred liquid bath
Temperature : 21 °C ± 2 °C
Relative humidity : 50 %RH ± 15 %RH
Approved on 23 October 2015
Institute service identifier : INM-L02-21
KCDB ID : SIM-T-CO-0000074P-1
Items for disseminating ITS-90 and PLTS 2000 , Temperature : 300 °C to 419.5 °C
Digital system thermometer (PRT sensor)
Absolute expanded uncertainty : 0.44 °C
Comparison in metal block furnace
Temperature : 21 °C ± 2 °C
Relative humidity : 50 %RH ± 15 %RH
Approved on 23 October 2015
Institute service identifier : INM-L02-37
KCDB ID : SIM-T-CO-00000755-1
Items for disseminating ITS-90 and PLTS 2000 , Temperature : 5 °C to 80 °C
Liquid-in-glass thermometer: 0.1 °C graduation
Absolute expanded uncertainty : 3.9E-2 °C
Comparison in stirred liquid bath
Temperature : 21 °C ± 2 °C
Relative humidity : 50 %RH ± 15 %RH
Approved on 23 October 2015
Institute service identifier : INM-L02-20
KCDB ID : SIM-T-CO-0000074O-1
Items for disseminating ITS-90 and PLTS 2000 , Temperature : 300 °C to 419.5 °C
Platinum Resistance Thermometer
Absolute expanded uncertainty : 0.44 °C
Comparison in metal block furnace
Temperature : 21 °C ± 2 °C
Relative humidity : 50 %RH ± 15 %RH
Approved on 23 October 2015
Institute service identifier : INM-L02-10
KCDB ID : SIM-T-CO-0000074E-1
Frequency , Frequency : 1 MHz to 10 MHz
Frequency meter
Relative expanded uncertainty : 1.0E-10 Hz/Hz
Direct frequency measurement of its time base
Measurement time : 1 d
Gate time : 1 s
Averaging time : 1 s to 32768 s
Amplitude : 100 mVrms to 12 Vrms (50 Ω), 100 mVrms to 30 Vrms (1 MΩ)
Approved on 10 February 2015
Institute service identifier : INM-L08-07
KCDB ID : SIM-TF-CO-00000AB2-1
Frequency , Frequency : 100 kHz
Local frequency standard
Relative expanded uncertainty : 6.0E-13 Hz/Hz
Measurement of phase difference
Measurement time : 20 h, 72 h, 100 h
Gate time : 1 s
Averaging time : 1 s to 32768 s, 1 s to 65536 s, 1 s to 131072 s
Approved on 10 February 2015
Institute service identifier : INM-L08-09
KCDB ID : SIM-TF-CO-00000AB4-1

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