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US 6,646,443 B2Granted
Ion concentration meter
AssigneeOrgano Corporation
InventorYuji Higo
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AssigneeOrgano Corporation
InventorYuji Higo
Estimating the term…
Two conductivity measuring cells each having at least two electrodes are arranged in series in a flow path of a sample to be measured so that the sample may make contact with the cells in sequence. A difference conductivity meter produces the difference between the signals themselves detected by the conductivity cells as the difference in conductivity of the sample between the positions of the conductivity measuring cells. Based on the predetermined correlation between the change in conductivity of the sample and the change in concentration of the ion of interest in the sample, an ion concentration meter thus constructed derives the change in ion concentration of the sample from the output from the difference conductivity meter. The ion concentration meter can measure a minute change in ion concentration, such as of ammonia, with extremely high accuracy and sensitivity, while carrying out continuous measurement.
An ion concentration meter characterized in that said ion concentration meter comprises a difference conductivity meter wherein two conductivity measuring cells each having at least two electrodes are arranged in series in a flow path of a sample to be measured so that a sample being sent makes contact with the cells in sequence, said difference conductivity meter producing a difference between signals themselves detected by the conductivity measuring cells as a difference in conductivity of the sample between the positions of the conductivity measuring cells, and said ion concentration meter deriving a change in ion concentration of the sample from the output from said difference conductivity meter, based on a predetermined correlation between a change in conductivity of the sample and a change in concentration of an ion to be detected in the sample, wherein a time delay column having a predetermined capacity is interposed between said two conductivity measuring cells arranged in said flow path of the sample to be measured.
An ion concentration meter characterized in that said ion concentration meter comprises a difference conductivity meter wherein two conductivity measuring cells each having at least two electrodes are arranged in series in a flow path of a sample to be measured so that a sample being sent makes contact with the cells in sequence, said difference conductivity meter producing a difference between signals themselves detected by the conductivity measuring cells as a difference in conductivity of the sample between the positions of the conductivity measuring cells, and said ion concentration meter deriving a change in ion concentration of the sample from the output from said difference conductivity meter, based on a predetermined correlation between a change in conductivity of the sample and a change in concentration of an ion to be detected in the sample, wherein said ion concentration meter further comprises means for sending a standard raw liquid to said flow path of the sample to be measured as a carrier fluid, and means for injecting a sample to be measured with respect to a change in ion concentration into said carrier fluid.
An ion concentration meter characterized in that said ion concentration meter comprises a difference conductivity meter wherein two conductivity measuring cells each having at least two electrodes are arranged in series in a flow path of a sample to be measured so that a sample being sent makes contact with the cells in sequence, said difference conductivity meter producing difference between signals themselves detected by the conductivity measuring cells as a difference in conductivity of the sample between the positions of the conductivity measuring cells, and said ion concentration meter deriving a change in ion concentration of the sample from the output from said difference conductivity meter, based on a predetermined correlation between a change in conductivity of the sample and a change in concentration of an ion to be detected in the sample, wherein said sample is collected from a brine in a cooling water producing system, and said ion concentration meter measures a change in concentration of ammonia which has leaked from the side of a refrigerator into said brine.
Dependencies are inferred from the claim text.