Irrigation regulator

Details Irrigation regulator Irrigation regulator

1991-08-14

1993-07-06

Taylor, Dennis L.

Hydraulic and earth engineering

Drainage or irrigation

Control means responsive to sensed condition

405 36, 137 783, E02B 1100, G05B 1100

Patent

active

052247953

ABSTRACT:
A moisture sensing device (2) operating according to the tensiometer principle which in the case of complete drying out emits the same signal as on reaching the maximum moisture content, in the case of complete drying out emits a signal corresponding to that with the minimum, set moisture content. A drying out prevention means (40) provided for this operates with the same contactor (24) and is operated by the same control member (18) as the sensing device (2) in normal operation. The switching point for the drying out prevention means (40) can be adjusted by means of an adjusting device (48). However, the water supply is switched on by the signal emitted on drying out.

REFERENCES:
patent: 3874590 (1975-04-01), Gibson
patent: 3910300 (1975-10-01), Tal
patent: 4015616 (1977-04-01), Hanff
patent: 4548225 (1985-10-01), Busalacchi
patent: 4763837 (1988-08-01), Livneh
patent: 4922945 (1990-05-01), Browne
patent: 4938248 (1990-07-01), Browne

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