| 摘要 |
PROBLEM TO BE SOLVED: To provide a liquid concentration measuring apparatus, capable of measuring a concentration furthermore with high accuracy without being affected by peripheral equipment regardless of an installation place, which is a concentration measuring device for measuring a component concentration of the liquid by utilizing a refractive index sensor.SOLUTION: The liquid concentration measuring apparatus is a device for measuring a refractive index of the liquid by the refractive index sensor 1, and for detecting the component concentration of the liquid based on the refractive index. The refractive index sensor 1 is stored in a casing 6 constituted of Fe-Ni alloy, and the refractive index sensor 1 is shielded from an external magnetic field. |
