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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)
Costa Rica, LACOMET (Laboratorio Costarricense de Metrologia)
Items for disseminating ITS-90 and PLTS 2000 , Temperature : -20 °C to 50 °C
Thermistors
Absolute expanded uncertainty : 8 mK
Comparison stirred alcohol and water baths
Temperature : 20 °C ± 2 °C
Relative humidity : 55 % ± 10 %/rh
Approved on 17 January 2013
Institute service identifier : LACOMET-02-2.2.3
Items for disseminating ITS-90 and PLTS 2000 , Temperature : -20 °C to 200 °C
Thermocouple (type E, J, K, N and T)
Absolute expanded uncertainty : 0.8 °C
Comparison stirred alcohol, water and oil baths
Temperature : 20 °C ± 2 °C
Relative humidity : 55 % ± 10 %/rh
Approved on 17 January 2013
Institute service identifier : LACOMET-02-2.3.2
Items for defining ITS-90 , Temperature : 660.323 °C
Long stem SPRT
Absolute expanded uncertainty : 4.6 mK
Aluminum freezing point
Temperature : 20 °C ± 2 °C
Relative humidity : 55 % ± 10 %/rh
Approved on 17 January 2013
Institute service identifier : LACOMET-02-1.3.2
Items for defining ITS-90 , Temperature : 156.5985 °C
Long stem SPRT
Absolute expanded uncertainty : 1.5 mK
Indium freezing point
Temperature : 20 °C ± 2 °C
Relative humidity : 55 % ± 15 %/rh
Approved on 17 January 2013
Institute service identifier : LACOMET-02-1.3.2
Items for defining ITS-90 , Temperature : 419.527 °C
Long stem SPRT
Absolute expanded uncertainty : 1.9 mK
Zinc freezing point
Temperature : 20 °C ± 2 °C
Relative humidity : 55 % ± 10 %/rh
Approved on 17 January 2013
Institute service identifier : LACOMET-02-1.3.2
Items for defining ITS-90 , Temperature : 231.928 °C
Long stem SPRT
Absolute expanded uncertainty : 1.5 mK
Tin freezing point
Temperature : 20 °C ± 2 °C
Relative humidity : 55 % ± 10 %/rh
Approved on 17 January 2013
Institute service identifier : LACOMET-02-1.3.2
Items for defining ITS-90 , Temperature : 29.7646 °C
Long stem SPRT
Absolute expanded uncertainty : 0.48 mK
Gallium melting point
Sealed cell
Approved on 17 January 2013
Institute service identifier : LACOMET-02-1.3.2
Items for defining ITS-90 , Temperature : -38.8344 °C
Long stem SPRT
Absolute expanded uncertainty : 0.49 mK
Mercury triple point
Temperature : 20 °C ± 2 °C
Relative humidity : 55 % ± 10 %/rh
Approved on 17 January 2013
Institute service identifier : LACOMET-02-1.3.2

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