Patent ID: 8088343

Claim:
An automatic analyzer comprising: a plurality of suction nozzles, each suction nozzle of the plurality of suction nozzles connected to a corresponding pipe configured to guide a negative pressure to the corresponding suction nozzle, wherein the plurality of suction nozzles are configured to be transferable between a disposal position and a cleaning position; a plurality of reaction vessels; a wastewater suction unit configured to generate the negative pressure such that the plurality of suction nozzles suction a reaction wastewater from each of the plurality of reaction vessels when the plurality of suction nozzles are in the disposal position, and suction a cleaning liquid when the plurality of suction nozzles are in the cleaning position, the wastewater suction unit including a plurality of pressure detectors, each pressure detector positioned near an associated suction nozzle of the plurality of suction nozzles in the corresponding pipe, and configured to detect pressure in each of the plurality of suction nozzles at time of suctioning of the reaction wastewater, a vessel determination unit configured to determine whether the plurality of reaction vessels are present or not at the disposal position, and a clog determination unit configured to determine whether each of the plurality of suction nozzles is clogged or not based on change in pressure detected by each of the plurality of pressure detectors and the presence or absence of the plurality of reaction vessels determined by the vessel determination unit.