MEASURING/CALCULATING DEVICE FOR LANGELIER'S INDEX

Japanese Patent JP3385767

B2

PURPOSE: To provide a measuring/calculating device continuously measuring the Langelier's index (LI) of city water with a simple means and capable of being utilized as the water quality monitor of the water service.
CONSTITUTION: This measuring/calculating device for the Langelier's index (LI) is provided with a water quality instrument 2 measuring the pH, water temperature, turbidity, chromaticity, and conductivity of test water, a determining circuit 3 determining the coefficients of the arithmetic equation via a water quality correlation test, an estimating circuit 4 estimating the total solid material quantity, calcium hardness, and M alkalinity from the measured values of the water quality, a determining circuit 5 determining the total solid material quantity, temperature coefficient, calcium hardness, and M alkalinity, and an arithmetic circuit 6 obtaining the Langelier's index-(LI) from the arithmetic equation based on the estimation and determination. A post-alkali injection control device is arranged on a clean water reservoir of service water, the total solid material quantity, calcium hardness, and alkalinity are inferred based on the pH value of the clean water reservoir, the target pH of the clean water reservoir is determined via the measurement of the Langelier's index (LI), then the alkali injection ratio of the alkali injection control device is controlled.

Hiroshi Tsukura

JP1117195A

March 10, 2003

January 27, 1995

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KABUSHIKI KAISHA MEIDENSHA

G01N33/18; (IPC1-7): G01N33/18

Ｔ．Ｈ．ＭＯＲＴＯＮ，ＡＮ ＡＬＧＯＲＩＴＨＭ ＦＯＲ ＴＨＥ ＬＡＮＧＥＬＩＥＲ ＩＮＤＥＸ ＯＦ ＰＲＯＣＥＳＳ ＷＡＴＲＥＲＳ，Ｊｏｕｒｎａｌ ｏｆ Ｔｈｅ ｉｎｓｔｉｔｕｔｉｏｎ ｏｆ Ｗａｔｅｒ Ｅｎｇｉｎｅｅｒｓ ａｎｄ Ｓｃｉｅｎｔｉｓｔｓ，１９７７年 １月，Ｖｏｌ．３１，Ｎｏ．１，２６−２８
清水邦雄，配管系内水質の簡易診断方法，設備と管理，日本，株式会社オーム社，１９７６年１０月 １日，第１０巻 第１１号，３８−３９

Fujiya Shiga (1 person outside)

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