Continuous flow metering apparatus

摘要: Continuous flow metering apparatus and methods using liquid position sensors in conjunction with flow-stopping valves control (meter) fluid, e.g. sample/reagent/air, aspiration into a single conduit, such as continuous system. Air or other gas separates selected ones of the segments. The volume aspirated segment is established by sensing parameter segmented stream one sensors. A pulse generated (detectors), for example due to change light intensity at liquidair interface traversing conduit. signal from sensor causes actuation stops (flow) path conduit through an air segment. valve cuts only. Therefore, body does not contact reagent sample this action risk carryover contamination avoided. With cycle completed, input end aspirating probe, can consequently be immersed different media repeated.