Title:
WATER LEVEL CONVERTING DEVICE
Document Type and Number:
Japanese Patent JPH01180016
Kind Code:
A
Abstract:
PURPOSE:To execute the water level detection of high accuracy even in case of a low water level by storing a value to correspond to a desired water level in a control means, detecting that the water level in a tank is less than a prescribed value when water supply is started and correcting the value to correspond to the desired water level. CONSTITUTION:When a surrounding temperature to be used and the characteristics of a diaphragm 15, a coil 16, a magnetic substance 17, a spring 18 and capacity 23 and 24, etc., are dispersed, relation between a water level (h) and a frequency is dispersed like an upper limit (g) and a lower limit (j) for the output of a water level detecting means 3. A control means 4 stores the prescribed frequency and inputs frequency data to be outputted by the water level detecting means 3. Then, a deciding frequency to correspond to the desired water level is calculated and the control of the title device is wholly executed as well. When a measured initial frequency is over a constant value (the water level of the tank is less than the prescribed value), a control means 4 calculates the desired water level based on the initial frequency and when the frequency is detected, the water supply is completed. Thus, regardless of the change of the surrounding temperature or the individual dispersion of the water level detecting means, the water level detection can be accurately executed.
Inventors:
MATSUI SHOICHI
KIUCHI MITSUSACHI
KIUCHI MITSUSACHI
Application Number:
JP286288A
Publication Date:
July 18, 1989
Filing Date:
January 08, 1988
Export Citation:
Assignee:
MATSUSHITA ELECTRIC IND CO LTD
International Classes:
G05D9/12; (IPC1-7): G05D9/12
Domestic Patent References:
| JPS6426213A | 1989-01-27 |
Attorney, Agent or Firm:
Tomoyuki Takimoto