Title:
WATER LEVEL CONVERTING DEVICE
Document Type and Number:
Japanese Patent JPH02301811
Kind Code:
A
Abstract:
PURPOSE:To always realize the stable decision of water level by correcting a deciding frequency for detecting the output frequency of a water level detector or the output frequency by using the value of a power supply frequency. CONSTITUTION:A control means inputs the signal of a power supply frequency inputting means 15, detects a power supply frequency by using a reference clock, and corrects the output frequency of a water level detecting means 3 corresponding to a desired water level in accordance with a decision value used when the power supply frequency is decided as a reference or the output data of the detecting means 3. Therefore, the water level can be maintained at a fixed stable level and the occurrence of an overflow and insufficient drainage can be eliminated, resulting in the improvement in the reliability of the equipment.
Inventors:
KOMATSU TAKASHI
IMAHASHI HISASHI
MATSUO SHIGERU
YOSHIDA TOSHIO
IMAHASHI HISASHI
MATSUO SHIGERU
YOSHIDA TOSHIO
Application Number:
JP12321089A
Publication Date:
December 13, 1990
Filing Date:
May 17, 1989
Export Citation:
Assignee:
MATSUSHITA ELECTRIC IND CO LTD
International Classes:
G05D9/12; (IPC1-7): G05D9/12
Attorney, Agent or Firm:
Shigetaka Awano (1 person outside)