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Calibration of Psychrometers at Spring Singapore

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Abstract

To assess the uniformity of the psychrometer coefficient of psychrometers commercially available in the market, results of calibrations of aspirated psychrometers and whirling (or sling) psychrometers performed by our laboratory at about 23°C and 55% rh over a period of six years are analyzed. It is found that although the psychrometer coefficient of a particular psychrometer can be quite consistent with long-term stability typically within the range of  ± 1% rh equivalent, there are larger variations (up to 4% rh equivalent) among different psychrometers even of the same type. The psychrometer coefficient variations in other temperature and humidity conditions are also studied through experiment using a randomly chosen aspirated psychrometer.

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Authors and Affiliations

  1. National Metrology Centre, Standards, Productivity and Innovation Board (SPRING), 1 Science Park Drive, TUV SUD PSB Corp Building, Singapore, 118221, Singapore

    Li Wang & Kiat Hem Tang

Authors
  1. Li Wang
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  2. Kiat Hem Tang
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Correspondence to Li Wang.

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Wang, L., Tang, K.H. Calibration of Psychrometers at Spring Singapore. Int J Thermophys 29, 1709–1718 (2008). https://doi.org/10.1007/s10765-007-0293-9

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  • DOI: https://doi.org/10.1007/s10765-007-0293-9

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