| 摘要 |
PURPOSE:To perform highly precise liquid level indication and alarm generation, by allowing a large-diameter magnet to attract a magnetic body provided at the outside of the upper and lower range of a small-diameter annular magnet and providing a simple function type magnetic proximity switch near said large- diameter magnet. CONSTITUTION:The magnetic body 14 which permits the small-diameter annular magnet 13 to pass through it is arranged at a lower position in the upper and lower movement range of said magnet 13 so that its upper and lower positions are freely adjustable. This magnetic body 14 serves as a stopper for setting an alarm generation level for a decrease in the amount of liquid and the large- diameter annular magnet 15 attracts itself to the reverse surface of the body 14, and the simple function type magnetic proximity switch 16 which operates by the magnetic force of the magnet 15 which attracts itself to the magnetic body 14 is provided near the magnet 15. This constitution increases mechanical strength and eliminates malfunction due to oscillation, etc., so highly precise liquid level indication and alarm generation are carried out. |
