Soil Moisture monitor

Details Soil Moisture monitor Soil Moisture monitor

1987-01-16

1989-07-25

Chambers, A. Michael

Fluid handling

Ambient condition change responsive

For controlling soil irrigation

324 61R, 324 61QS, 324 61P, 361178, 361181, F16K 1726

Patent

active

048503860

ABSTRACT:
A monitor or sensor for sensing the moisture content of a surrounding medium comprises two electrodes connected in a detector circuit for detecting the impedance between them and producing an output signal proportional to the impedance. At least one of the electrodes is covered by a dielectric coating and the other electrode is positioned to minimize any capacitative effects between the electrodes through the surrounding medium. The detector may comprise a multivibrator with an output frequency controlled by the sensor impedance, and the output signal can be used to control the operation of watering equipment.

REFERENCES:
patent: 3683671 (1972-08-01), Van Swaay
patent: 3793585 (1974-02-01), Wilska
patent: 3870951 (1975-03-01), Brown et al.
patent: 3879644 (1975-04-01), Maltby
patent: 3882381 (1975-05-01), Gregory
patent: 4023206 (1977-05-01), Nishibe et al.
patent: 4137931 (1979-02-01), Hasenbeck
patent: 4175239 (1979-11-01), Sandler

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