at the time decided (for example, 5:00 a.m.) ,the gas density data for two years can be saved in the Compact Flash memory of the storehouse in the Web server unit every day.
The manipulator can display a graph of the gas density every sensor with a graph indication screen to watch throw leak of the gas. In addition, the storage device (for example, HDD) of the display (a personal computer with the browser function) can download the data.
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