| 摘要 |
PURPOSE:To detect the electric conductivity of a sample efficiently by detecting the electric conductivity of the sample on the basis of output voltages from metallic blocks when sample liquid and objective liquid are introduced into flow cell parts respectively, and compensating an output originating the electric conductivity of the objective liquid itself. CONSTITUTION:A measuring cell 1 is constituted by laminating metallic plates 4 and 4' provided with intakes 42 and 42' and outlets 43 and 43' on both surfaces of a metallic plate 6 across insulating plates 5 and 5' which has an elliptic opening in the center, and independent flow cell parts 7 and 7' are set on both surfaces of the metallic plate 6. A power source part 2 applies a reverse voltage to the metallic plates 4 and 4' through conductors 41 and 41'. A detection part 3 detects the voltage of the metallic block 6 through a conductor 61. An objective carrier liquid is introduced into the flow cells 7 and 7'. When a sample liquid is introduced into one flow cell, the output depending upon the electric conductivity of the carrier liquid itself is compensated and only a voltage based upon the electric conductivity of the sample is outputted to the output terminal of an operational amplifier 31, so that the electric conductivity of the sample is detected. Further, the measurement is performed with high sensitivity and high precision. |
