Title:
WATER LEVEL CONTROLLER
Document Type and Number:
Japanese Patent JPS63220308
Kind Code:
A
Abstract:
PURPOSE:To rationally drive a pump while keeping environmental maintenance around a liquid tank by driving the pump when a water level is increased up to an intermediate level after actuating a timer for a restricted time from the passage of a prescribed set time and when the prescribed set time has elapsed during the period that the water level reaches the upper limit level after exceeding the intermediate level. CONSTITUTION:When the timer 22 is started at the time of stopping the driving of the pump 12 and the timer is driven for the restricted timer after the passage of the prescribed set time from the excess of the intermediate level 15, the pump 12 is driven before the water level reaches the upper limit level, and when the prescribed time has elapsed before its arrival at the intermediate level 15, the pump 12 is driven simultaneously with the arrival of the water level at the intermediate level. Consequently, the emission of offensive odor due to the stagnancy of the large volume of water >= the intermediate level for a long period is not generated, and when the inflow of water is much, the pump can be automatically driven with a fixed water level between the upper and lower water levels 14, 16.
Inventors:
UMEDA AKINORI
Application Number:
JP5468387A
Publication Date:
September 13, 1988
Filing Date:
March 10, 1987
Export Citation:
Assignee:
SHIN MEIWA IND CO LTD
International Classes:
G05D9/12; (IPC1-7): G05D9/12