| 摘要 |
The invention concerns a device comprising two cylinder/piston pumping units (1, 2) whereof the rods are driven in translation by common motoring means (MC). The working chamber of said two pumping units (1, 2) is connected to a circuit comprising successively a conduit emerging into a rinsing liquid reserve (RL), two successive electromagnetic valves (EV1, EV2) and a pipe (TS) connected to pipetting means (AP), the larger working chamber being connected in the part of said circuit providing the junction between the electromagnetic valves (EV1, EV2) while the other working chamber is connected in the part of the circuit located between the second electromagnetic valve (EV2) and the pipetting means (AP).
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