Measuring and testing – Moisture content or absorption characteristic of material
Patent
1982-11-09
1985-04-30
Stearns, Richard R.
Measuring and testing
Moisture content or absorption characteristic of material
323363, 323365, 324 65P, G01R 2720, G01N 2712
Patent
active
045136084
ABSTRACT:
A moisture sensing element is provided and is constructed of a body having therein a first zone formed of porous material with a first range of pore size having a first mean pore size and a second zone formed of a porous material with a second range of pore size having a second mean pore size such that in use the body is located within a desired soil area under surveillance whereby both the first and second zones are placed in hydraulic conduction with the desired soil area. The first mean pore size is substantially greater than the second mean pore size such that the second zone will remain hydrated when the first zone is becoming dehydrated. Electrode elements are associated with each of the first and second zones in spaced relation and define therebetween respective electric current flow paths through each of the first and second zones for sensing an electrical property of each of the zones. The control devices further include a magnetic isolating device for electrically isolating respective pairs of electrode elements.
REFERENCES:
patent: 2636962 (1953-04-01), Bouyoucos
patent: 2729099 (1956-01-01), Rosenthal
patent: 2740032 (1956-03-01), Bouyoucos
patent: 2812976 (1957-11-01), Hasenkamp
patent: 2941174 (1960-06-01), Richards
patent: 3376501 (1968-04-01), Peranio
patent: 3508148 (1970-04-01), Enfield
patent: 3782179 (1974-01-01), Richards
patent: 4137931 (1979-02-01), Hasenbeck
patent: 4321577 (1982-03-01), Carlson
Stearns Richard R.
Worth W. Morris
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