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특허 상세정보

Moisture sensing electronic irrigation control

특허상세정보
국가/구분 United States(US) Patent 등록
국제특허분류(IPC7판) B05B-012/12    A01G-025/16   
미국특허분류(USC) 239/064 ; 137/078.3 ; 239/069 ; 405/037
출원번호 US-0651740 (1996-05-22)
발명자 / 주소
출원인 / 주소
인용정보 피인용 횟수 : 48  인용 특허 : 0
초록

An apparatus for soil irrigation control comprising a control unit, a soil probe, and a temperature probe. The function of the invention is to provide day-to-day soil moisture measurement and control of the irrigation system it is attached to, usually a timer operated system. During operation, the control circuitry periodically measures the apparent electrical resistance between the two electrodes of the soil probe. A signal related to the measured resistance is then compared to a reference set by the user and functions to close or open an electrical swi...

대표
청구항

[ What is claimed is:] [1.] An apparatus for comparing the amount of moisture in soil with a reference setting and controlling the application of irrigation water, comprising:an electronic means for generating periodic electrical current pulses that pass through the soil between two conductive electrodes fixed upon a nonconductive support and disposed beneath the surface of the soil, said electrical current being in the form of a unipolar pulse of the briefest practical duration followed immediately by a unipolar pulse of the same duration and current am...

이 특허를 인용한 특허 피인용횟수: 48

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