FIELD: precise automatic sampling device with washing of pipette.
SUBSTANCE: in accordance to invention device contains at least two pumping devices of cylinder-piston type, which are driven by one common electric motor MP. Pumping chamber of each one of pumping devices is connected to contour, containing, serially: channel exiting into reservoir RL of washing liquid, three serial electromagnetic valve (EV1, EV2, EV3) and a section of contour, which connects second electromagnetic valve (EV2) to pipette device AP. Bigger pumping chamber is connected to section of contour which provides connection between two electromagnetic valves (EV1, EV2), while second pumping chamber is connected to aforementioned section of contour by means of connector, while aforementioned section of contour contains electromagnetic valve EV3 positioned between connector and pipette device.
EFFECT: increased reliability and precision of device operation.
1 cl, 8 dwg
