Patent ID: 7628067
Filing Date: 2009-12-08
Classification: G01F

Abstract:
1. A method of detecting water-level in a metal container employing an electrode rod for detecting the water-level, the method comprising: connecting one side of a power supply to an external power supply connecting terminal part of the electrode rod and connecting another side of the power supply to the metal container for energization; measuring an electrostatic capacity between a water-level detecting electrode part of the electrode rod and the metal container by using as a dielectric an insulating coating formed on a surface of the water-level detecting electrode part; detecting water-level of water to be brought into contact with the water-level detecting electrode part in the metal container from the electrostatic capacity; providing to the container an adjusting electrode rod for detecting water-level for detecting specific water-level within a range of the water-level detecting electrode part; determining a difference between the specific water-level detected by the adjusting electrode rod for detecting water-level and water-level detected by measuring the electrostatic capacity; and adjusting the water-level to be detected by measuring the electrostatic capacity based on the difference.