Electricity: measuring and testing – Conductor identification or location – Inaccessible
Patent
1986-05-19
1989-06-06
Pellinen, A. D.
Electricity: measuring and testing
Conductor identification or location
Inaccessible
324 61R, 324 65R, 324 65P, 73 73, G01R 2702
Patent
active
048374997
ABSTRACT:
A moisture sensing device for an irrigation system is disclosed. A pair of concentrically disposed cylindrical conductors are separated by a fibrous material, such that a capacitor is formed whose resistance will vary in response to the level of moisture present in the fibrous material. An electrical circuit is connected across the cylindrical conductors for measuring the variable resistance caused by the level of moisture present in the fibrous material. If the soil is dry enough to require watering, the sensor circuit will produce an output signal to the appropriate solenoid in the irrigation system to permit watering.
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Fuller L.
Pellinen A. D.
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