Control method for automatic analyzer

A control method for an automatic analyzer including a switch valve having a plurality of sample ports, the switch valve configured to selectively switch between conduction and interruption between the plurality of sample ports, a sample loop connected between two sample ports, a first sample port and a second sample port in the plurality of sample ports of the switch valve, a syringe connected to a third sample port of the plurality of sample ports that is different from the first sample port and the second sample port of the switch valve, a sipper connected to a fourth sample port of the plurality of sample ports that is different from the first sample port, the second sample, and the third sample port of the switch valve, the sipper immersed in a sample housed in a sample vessel, the method comprising:

• adjusting a drive parameter of the syringe, which is a drive velocity of the syringe, based on a viscosity of the sample in advance;
• switching the switch valve to a first state in which the sipper and the syringe are in fluid communication with each other without passing through the sample loop;
• driving the syringe based on the drive parameter to draw and introduce the sample through the sipper;
• switching the switch valve to a second state in which the syringe and the sample loop are in fluid communication with each other;
• and
• driving the syringe based on the drive parameter to introduce the sample into the sample loop,
• wherein the drive parameter for the syringe is adjusted such that the drive parameter is nonlinearly changed corresponding to a lapse of a driving time of the syringe.