| 摘要 |
Disclosed herein is a method of controlling the water level of a pressure tank of a piping system. The piping system includes a pressure tank, level sensors, a gas supply device, a supply valve and an exhaust valve. The method includes: measuring the water level; calculating absolute values of difference values between water level measurement values measured by the level sensors, thus obtaining measurement deviation values; comparing the measurement deviation values with a preset deviation value; determining whether an abnormality has occurred in each level sensor; outputting the mean of the measurements of the level sensors, while excluding the measurement of an abnormal level sensor(s), as a reference water-level-control value; and comparing the reference water-level-control value with a preset reference water level value, and determining whether to raise or lower the water level, and supplying gas into the pressure tank or exhausting gas therefrom.
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