| 摘要 |
PROBLEM TO BE SOLVED: To provide a liquid level detector in which the output of magnetic sensors is made to be almost linear to liquid levels so that search for a magnet position becomes unnecessary.SOLUTION: A magnet 3 is floated on a liquid level of liquid stored in a tank 2 and vertically moves in response to changes in the liquid level of the liquid. Four magnetic sensors 5A-5D are vertically arranged to separate from each other within the vertical movement of the magnet 3. An operational amplifier calculates a value obtained by subtracting an addition value, obtained by adding output values of the lower half of the four magnetic sensors 5A-5D, from an addition value, obtained by adding output values of the upper half of the four magnetic sensors 5A-5D, to detect a liquid level. |
