Irrigation controlling device

摘要

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.