MICRODOSE METERING DEVICE Russian patent published in 1995 - IPC

FIELD: measurement technology. SUBSTANCE: device has a pair of drums linked by threads of different cross-sections wound in opposite directions and a pair of drums linked by other threads, all mounted in reservoir having an opening and beyond it on shafts. Pressure regulators are mounted on the drive shaft. Upon micropipet operating in the reservoir, the thin thread is wound on a drum. The liquid having filled the reservoir, the thread is rewound over another drum, more thick thread being concurrently wound over the first drum at the same time. A volume of liquid equal to the difference between volumes of both threads is forced out of the reservoir through the opening. To change the flow rate, a pair of drums is connected to the drive by means of pressure regulator. EFFECT: enhanced accuracy in working with liquids in ultrasmall quantities. 2 cl, 1 dwg