Liquid volume control device and control method for liquid volume using the same

A liquid volume control device for controlling a liquid volume of a liquid in a test tube, the liquid volume control device comprises:

• a pump connected to a pipette for sucking the liquid out of the test tube;
• a driver connected to the pump and used to drive the pump;
• a transfer device for transferring the test tube;
• a camera for capturing a first image of a suction end of the pipette and a second image of the liquid in the test tube;
• and
• a controller electrically connected to the camera, the transfer device, the driver and the pump, and used to:
• control the driver to drive the suction end of the pipette into a capture area of the camera, and analyze the first image to determine a height compensation value of the suction end of the pipette;
• analyze the second image to determine a total volume of the liquid, and calculate a first insertion depth of the pipette according to the total volume and a specified retention volume;
• calculate a second insertion depth according to the first insertion depth and the height compensation value;
• control the driver to drive the suction end of the pipette into the liquid to the second insertion depth;
• and
• control the pump to suck the liquid in the test tube through the pipette.