Electrical conductivity detector with phase difference correction

An electrical conductivity detector comprising:

• a waveform output unit configured to supply an alternating current (AC) signal to a measurement target;
• and
• a controller configured to control the waveform output unit,
• wherein the controller is configured to execute multiplication processing for multiplying a detected wave acquired when the AC signal passes through the measurement target by a reference wave for detecting electrical conductivity,
• wherein the controller is configured to cause the waveform output unit to generate a waveform with a dummy peak superimposed on an input wave as the AC signal and execute phase difference detection processing for detecting a phase difference between the detected wave and the AC signal acquired correspondingly, and
• wherein the controller is configured to cause the waveform output unit to generate a waveform with no dummy peak superimposed on the input wave as the AC signal, execute processing for correcting the phase difference with respect to the reference wave for detecting electrical conductivity, and execute electrical conductivity calculation processing for calculating the electrical conductivity based on a result of the multiplication processing for multiplying the detected wave.