Automatic analyzer including pressure sensor for washing solution

An automatic analyzer including:

• a dispensing nozzle that suctions and discharges a predetermined amount of liquid;
• a dispensing syringe that is connected the dispensing nozzle;
• a washing solution storage tank that stores a washing solution for washing the dispensing nozzle;
• and
• a washing solution supply piping that connects the washing solution storage tank to the dispensing syringe and connects the dispensing nozzle to the dispensing syringe;
• a pump that is installed in the washing solution supply piping that connects the washing solution storage tank to the dispensing syringe that supplies the washing water under pressure;
• a pressure sensor that is installed in the washing solution supply piping that connects the dispensing nozzle to the dispensing syringe;
• a solenoid valve that is installed in the washing solution supply piping;
• and
• a processor that receives an output from the pressure sensor when the washing solution is supplied from the washing solution storage tank to the dispensing syringe or when the washing solution is supplied to the dispensing nozzle from the dispensing syringe, and the processor is programmed to determine that an opening and closing of the solenoid valve is not properly timed and washing is not normally performed when a time interval from when the pressure starts to change when the solenoid valve opens or closes until the pressure stabilizes is greater than or equal to a predetermined value.