Volume measurement pipette pump

Figure 12.6 illustrates the outline of such an analysis. An automatic pipette extracts a preset volume of the liquid sample (or solution) from a cup presented to it on a turntable. The measured sample is mixed with the reagents in the appropriate proportions, and propelled through the instrument by the peristaltic proportioning pump. This pump operates by means of moving bars, attached to a chain drive, which sequentially compress the plastic sample and reagent tubes to drive the liquids forward through the instrument. The incorporation of a succession of air bubbles at... 

Fig. 3.1. C02 delivery systems. On the left is a simple arrangement where air (from an air pump) may be mixed with C02 to produce 5% C02 in air for gassing bottles or feeding to an incubator. On the right is an arrangement for measuring out fixed volumes of C02 and delivering them through a three-way tap (at the bottom of the syringe) and a sterile Pasteur pipette to a bottle of cells.

---