| 摘要 |
PURPOSE:To prevent an excessive pressure from being exerted on a pressure sensor and to perform filling with hot water up to an accurate water level by a method wherein a water level in a bath tub is detected by means of the pressure sensor and a valve for controlling filling with hot water is located in a pipe line for filling with hot water. CONSTITUTION:A valve 100 for controlling filling with hot water is disposed in a pipe line for filling with hot water. Since, during filling with hot water, the valve for controlling filling with hot water is set to a filling with hot water position and only during measurement of a water level by means of a pressure sensor 8, the valve for controlling filling with water is switched to a water level measuring position, there is entirely no fear of an excessive pressure being exerted on the pressure sensor. In initial operation during mounting of a device, a reference water level in a pressure sensor chamber being a specified water level is detected to store it in a microcomputer control part. In following operation, a water level in the pressure sensor chamber is detected and compared with a stored value. When the two values are difference from each other, a P-Q graph is shifted by a difference therebetween. Since, based on the shifted P-Q graph, filling with hot water is controlled, even when the detecting value of the pressure sensor is changed with age, the change is corrected to perform filling with hot water up to an accurate water level. |
