Title:
【発明の名称】水位変換装置
Document Type and Number:
Japanese Patent JP2511938
Kind Code:
B2
Abstract:
PURPOSE:To detect a water level with high accuracy even at the time of a low water level, by measuring the value from a water level detection means when a water level is zero and calculating the value corresponding to a desired water level on the basis of said value. CONSTITUTION:When water is supplied up to a water level (he), the initial frequency (fox) of a water level detection means 3, which detects a water level to convert the same to frequency data, when a water level is zero is measured at first by a control means 4. Next, the frequency (fe') corresponding to the water level he of the water level detection means 3 used presently is calculated from the relation between a water level and frequency of the average sample, irregularity upper limit sample and irregularity lower limit sample of the water level detection means 3, which are stored in the control means 4 and the initial frequency fox, by the control means 4. Then, the output frequencies (fx), fe' of the water level detection means 3 are compared with each other at a predeter mined time interval and, at the time of fx<=fe', a water supply valve 12 is turned OFF to stop water supply operation.
Inventors:
MATSUI SHOICHI
KIUCHI MITSUSACHI
KIUCHI MITSUSACHI
Application Number:
JP5561587A
Publication Date:
July 03, 1996
Filing Date:
March 11, 1987
Export Citation:
Assignee:
MATSUSHITA ELECTRIC IND CO LTD
International Classes:
G01F23/00; G01F23/18; G01F23/26; G05D9/12; G01F23/14; (IPC1-7): G01F23/18; G01F23/00; G01F23/26; G05D9/12
Domestic Patent References:
| JP5241555A | ||||
| JP61112229U | ||||
| JP58104929U |
Attorney, Agent or Firm:
Tomoyuki Takimoto