Agronomy Journal Journal of Natural Resources and Life Sciences Education
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Published online 1 March 1973
Published in Agron J 65:238-239 (1973)
© 1973 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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A Miniature Gravity-Fed Thermocouple Psychrometer1

S. T. Mitchell, B. A. Kimball and W. L. Ehrler2

A miniature gravity-fed thermocouple psychrometer was constructed and tested over a wide range of humidities and flow rates. The unit gave accurate wet bulb depression in 6-mm flow tubes through an acrylic plastic block with a minimum flow rate of only 0.06 m/sec at 35% RH, and of only 0.09 m/sec at 11% RH.

The psychrometer also agreed exactly with a standard psychrcmeter (Assmann type) in open air without forced ventilation or radiation shielding.

Key Words: Water vapor pressure • Wet bulb depression

1 Contribution from the Soil and Water Conservation Research Division, Agricultural Research Service, USDA.

2 Physical Science Technician, Soil Scientist, and Research Plant Physiologist, U.S. Water Conservation Laboratory, Phoenix, Ariz.

Received for publication April 20, 1972.




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Copyright © 1973 by the American Society of Agronomy.