| 摘要 |
PROBLEM TO BE SOLVED: To provide a water level gauge with which it is possible to suppress erroneous detection caused by a fluctuation in water level due to the effect of sunlight and accurately detect the leakage of a liquid in a tank, etc., installed outdoors.SOLUTION: A leakage detection method according to the present invention is configured to detect the leakage of a liquid 102 stored in a tank 100, the method including the steps of: measuring the water level of the tank 100; acquiring the atmospheric temperature around the tank; accumulating data by correlating the atmospheric temperature and the water level; dividing the time slot of one day into a daytime slot including sunshine duration and a nighttime slot not including sunshine duration; calculating the approximation expression of a relation between the atmospheric temperature and the water level from the data accumulated in the past; predicting a water level from the approximation expression and the current atmospheric temperature for at least the daytime slot; and detecting leakage using a difference between a predicted water level and a measured water level.SELECTED DRAWING: Figure 5 |
