Semiautomation of Irrigated Basins and Borders: III. Control Elements and System Operation

Humpherys, A.S.

doi:10.13031/2013.25720

Cited by 2 publications

(2 citation statements)

References 4 publications

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“…Water sensor 2 borders by connecting the sensor to the common and either one communication conductor or the other. A two-station controller at the head end of the field can serve two lands if located relatively close to the two "first" gates of a tripcord gate release system (Humpherys, 1995); otherwise, two single-station controllers would be used. In operation, all sensor connections should be made before turning the station controller on, because electrical transients or static electricity may occasionally trigger the SCR if connections are made after the unit is turned on.…”

Section: Water Sensormentioning

confidence: 99%

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Water Sensor Feedback Control System for Surface Irrigation

Humpherys¹,

Fisher²

1995

Applied Engineering in Agriculture

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A water sensor feedback control system was developed to control semiautomatic irrigation of basins and borders. When water reaches a sensor at a downfield irrigation cutoff point, a signal to terminate irrigation is sent via wire or infrared (IR) telemetry to a station controller or receiver at the upper end of the field. The sensor uses a monostable interface to strengthen the signal for wire transmission, and prevents continuous IR transmission during the time the sensor is immersed or remains wet. The water sensor controller, powered by a 12-V battery, uses a silicon controlled rectifier (SCR) triggered by the feedback signal to discharge a capacitor through an electric solenoid. The energized solenoid actuates a gate release or valve to terminate irrigation of one field segment and begin irrigation of another. The water sensor system was tested in a level basin irrigation system.

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Section: Water Sensormentioning

confidence: 99%

“…5) or IR receiver at the head end of the field to terminate irrigation. The first of four gates serving the basin was released by an electric solenoid while the other gates were released by a trip-cord gate release system (Humpherys, 1995). Gates serving the next basin in sequence could also be opened simultaneously with this system.…”

Section: Field Testsmentioning

confidence: 99%