Capacitive calcium hydroxide online concentration analyzer and concentration analysis method

The capacitive calcium hydroxide online concentration analyzer comprises an analyzer system and a hydrometer, the hydrometer comprises a hydrometer connecting rod, the hydrometer connecting rod is in sliding connection with the analyzer system, a permanent magnet is embedded in the upper end of the hydrometer connecting rod, and the hydrometer connecting rod is in sliding connection with the analyzer system. An adjustable capacitor assembly is arranged on one side of the position where the permanent magnet is located at the end of the hydrometer connecting rod, a magnetic induction body used for inducing the orientation of the permanent magnet is arranged on the adjustable capacitor assembly, and when the hydrometer connecting rod moves up and down, the change of capacitance is achieved through the acting force between the permanent magnet and the magnetic induction body, and the concentration of a solution is converted into the change of the capacitance; the adjustable capacitor assembly detects the displace