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in Technical Regulation and Metrology
FSUE «VNIIFTRI»
Major divisions » Division of physicotechnical measurements №15 » Measuring Facilities of the East-Siberian branch in hygrometry »

    Measuring Facilities of the East-Siberian branch in hygrometry

    Procedures of gas humidity values interconversion developed by the East-Siberian branch of FSUE «VNIIFTRI» allows to transfer sizes of the following units:

    Value

    Range

    Residual bias

    Relative Humidity,

    j , %

    5 ÷ 98

    0,1 ÷  0,2 %

    Molar part of moisture ,  Xn , млн-1

    0,6 ÷ 700000

    0,13  ÷ 1,4 %

    Dew/frost point temperature, Td , °C

    -80 ÷ +90

    0,04 ÷ 0,08 °C

    Standard complex of the East-Siberian branch with regard to gas humidity measurements includes:

    –  National primary standard of the gas humidity unit GET 151-86

    –  Reference and working gas humidity standards of the East-Siberian branch

    Title

    Value of humidity

    Range

    Uncertainty

    (expanded uncertainty)

    UVT-103A-2001 Molar part of moisture

    P=(0,1 ¸ 10,0 )MPa

    t=(+5 ¸  +60 ) °С

    50 ¸ 10 000 mln-1

    ±0,9 %

    UVT-2008 Molar part of moisture

    P=(0,1 ¸ 10,0) MPa

    t=(-1 ¸  -60 ) °С

    0,1 ¸ 6100 mln-1

    ±2,5 %

    Rodnik-2M Relative humidity

    Volume part of moisture

    Dew/frost point temperature

    5¸99 %

    300¸150 000 mln-1

    -33 ¸ +54 °С

    ±0,5 %

    ±1%

    ±0,1 °С

    Sever-1 Dew/frost point temperature

    Molar part of moisture

    -70 ¸ +20 °С

    ±0,5 °С

    (+20 ¸ -40 )°С

    ±0,6 °С

    (-40 ¸ -70 )°С

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