Fluid handling – Ambient condition change responsive – For controlling soil irrigation
Patent
1984-08-30
1987-08-04
Chambers, A. Michael
Fluid handling
Ambient condition change responsive
For controlling soil irrigation
13762411, 239 63, 239 64, 331 65, 361178, 361196, 361203, 324 61QL, A01G 2516
Patent
active
046839046
ABSTRACT:
A moisture sensor having an oscillator circuit with its output frequency directly proportional to moisture percentage present in the substance of interest, such as soil. The oscillator circuit includes two spaced plates in the substance which function as a capacitor. The frequency of the oscillations changes as the capacitance between the plates changes due to the moisture present between the plates. The sensor is particularly adapted for use as a soil moisture detector and provides indications of moisture percentage or end points such as wet or dry conditions.
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Alexander Ranya L.
Chambers A. Michael
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