Importance

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Abstract

A discharge system for a tubing system in an apparatus for the selective transport of fluid volume quantities, for instance in a particle analyzer. Fluid is transported by means of a delivery pump from a first vessel through a transport conduit to a second vessel. Carry-over from one specimen to the next as well as foam, droplets and bubbles at the outlet or delivery nozzle are to be circumvented. A substantially T-shaped fitting is arranged in the transport conduit and its lateral branch leads through a valve to a collector vessel which is maintained under vacuum by a pump. After closing the valve and filling the first vessel, the delivery pump is operated. When a predetermined fluid volume has been attained in the second vessel, the valve is opened and a further pump operated whereupon the entire fluid quantity contained in the transport conduit and in the first vessel is drawn into the collector vessel: in particular, the fluid in the outlet nozzle and in the tubing system connected to such outlet nozzle is drawn or sucked back. When only air is taken in, the pumps can be turned off and the process can be repeated. The reverse suction at the outlet nozzle prevents the formation of foam, droplets and bubbles and the conduits of the tubing system are well drained.

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First Claim