| 摘要 |
PURPOSE:To make it possible to detect only an electromagnetically induced signal, by receiving the detection coil opposed to an exciting coil in a hermetically closed container and providing an AC signal applying means and a detection means to the electromagnetic induction pair immersed in a solution to be measured. CONSTITUTION:Because the resistance RX of a liquid channel coil X is changed by the conductivity of a solution to be measured, if an AC signal is applied to an exciting coil L1 and the signal electromagnetically induced to a detection coil L2 through a liquid channel coil LX is measured, the conductivity of the solution to be measured can be measured from the amplitude value of said AC signal. Because the exciting coil L1 and detection coil L2 in an electromagnetic induction coil pair utilize an electromagnetic induction phenomena, the direct contact with the solution of both coils are not required. Because the control signal of the exciting AC signal is detected, the noise signal between the exciting coil L1 and the detection coil L2 and be perfectly cut off.
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