Measuring and testing – Moisture content or absorption characteristic of material
Patent
1984-01-23
1987-04-07
Frankfort, Charles
Measuring and testing
Moisture content or absorption characteristic of material
73337, G01N 1910
Patent
active
046550763
ABSTRACT:
An apparatus for measuring the moisture content of soil includes a chamber having a water-swellable material in the chamber, the chamber being sized so that the water-swellable material can swell to its fully swollen state, with the external resistance, if any, against the swelling being substantially constant. The device includes a device for transmitting water to the water-swellable material so that it is in equilibrium with the environment. A sensor responsive to the volume of the water-swellable material is provided to indicate the water content of the environment exterior of the apparatus. The preferred sensor is a magnet moveable by the water-swellable material and a Hall effect sensing device.
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Lion Roger D.
Weihe Gary R.
Burkard Herbert G.
Frankfort Charles
Raychem Corporation
Rice Edith A.
Will Thomas B.
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