Title:
WATER LEVEL CONTROLLER
Document Type and Number:
Japanese Patent JPH1115533
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To prevent the failure that is caused by the idle operation of an underwater pump when the normal water level control becomes impossible due to the abnormality of a water level sensor, etc. SOLUTION: When a water level sensor 12 detects that the level of a sewage tank 20 reaches an operation level in a prescribed range, a motor 11a of an underwater pump 11 is driven in the the tank 20 and the waste water is discharged out of the tank 20. At the same time, a timer starts to count the time and the drive of the motor 11a is stopped after it's driven for a fixed time. Thus, the drive of the motor 11a is stopped even when the sewage level is lowered less than a prescribed range due to the abnormality of the sensor 12. As a result, the failure of the motor 11a can be prevented. When a level upper limit sensor 13 detects that the sewage level exceeds its prescribed upper limit value in the tank 20, the motor 11a is driven for a prescribed time.
Inventors:
KASAMATSU KAZUHIDE
YAMAMOTO KANJI
YAMAMOTO KANJI
Application Number:
JP16603297A
Publication Date:
January 22, 1999
Filing Date:
June 23, 1997
Export Citation:
Assignee:
SHIN MEIWA IND CO LTD
International Classes:
E03F7/00; G05D9/02; (IPC1-7): G05D9/02; E03F7/00