Abstract: A pumping device including a housing whose front face is at least partly formed by a block of transparent material, this block containing a number of machine-drilled holes including at least one blind hole forming a work chamber, at least one hole forming an admission and/or exhaust channel leading into the blind hole, two through channels whose orifices on the front face of the block are fitted with hydraulic hose connection means, two solenoid valves, a plunger sliding leaktightly in a bearing fitted to the orifice of the blind hole, this plunger defining with the blind hole a volume that varies as a function of the axial position of the plunger, and a module connected to the base of the plunger for moving the plunger translationally. The pumping device can be used for pipetting, dilution, rinsing and/or dispensing of samples, regardless of the envisaged volume ranges.

Abstract: The pump unit according to the invention is formed by assembling a pump module (9) comprising a body having a cavity (10) forming a working chamber, a translationally mobile piston (15) engaging leaktightly in the cavity (10) via a seal (14), at least one channel (12, 13) formed in the body to connect the working chamber to a use circuit, a linear actuating module comprising an actuating member (3) that is translationally mobile coaxially with the piston (15), and a connecting and guiding module (18) for establishing a mechanical connection between the pump module (9) and the linear actuating module (2) and for precise guidance of the piston (15) coaxially with the seal.

Abstract: The invention relates to a pumping device comprising: a housing (1) whose front face (2) is at least partly formed by a block of transparent material (3), this block (3) containing a number of machine-drilled holes including at least one blind hole (4) forming a work chamber (17), at least one hole forming an admission and/or exhaust channel (5) leading into the blind hole (4), two through channels (6, 7) whose orifices (10, 11) on the front face (8) of the block (3) are fitted with hydraulic hose connection means, two solenoid valves, a plunger (15) sliding leaktightly in a bearing (16) fitted to the orifice of the blind hole (4), this plunger (15) defining with said blind hole (4) a volume that varies as a function of the axial position of the plunger (15), and a module connected to the base of the plunger for moving the plunger (15) translationally. The invention applies to the pipetting, dilution, rinsing and/or dispensing of samples, that is to say irrespective of the envisaged sections of volume.