Cleaning device, method for detecting suction nozzle clogging, and automatic analyzer

An analyzer with a clog detection device, the clog detection device comprising:

• a suction nozzle made of electro-conductive material configured for sucking liquid in a vessel;
• a pipe connecting the suction nozzle to a discharge vessel;
• a first electrode coupled to the pipe;
• a second electrode coupled to the pipe and disposed in between the suction nozzle and the first electrode;
• a detecting unit coupled to the suction nozzle, the first electrode, and the second electrode, wherein the detecting unit is programmed to (i) detect an output signal between the first electrode and the second electrode, between the suction nozzle and the second electrode, or between the suction nozzle and the first electrode;
• (ii) compare the output signal to a threshold value;
• and (iii) output the difference between the output signal and the threshold value over time to a determination unit coupled to the detecting unit;
• and
• the determination unit, wherein the determination unit is programmed to (i) set a preset normal determination time and a preset clogging determination time;
• and (ii) determine that the suction nozzle is clogged when a totalizing time, for which the output signal exceeds the threshold value during the preset clogging determination time, is longer than a totalizing time, for which the output signal exceeds the threshold value during the preset normal determination time.