ANALYTIC APPARATUS AND METHOD.

摘要

A method of analysis in which a first fluid is delivered to a sensing position at a controlled first rate of flow through a fluid junction. Fluid including this first fluid is pumped to the sensing position at a rate of flow greater than the first rate, whereby to aspirate further fluid into the first fluid at the fluid junction. A condition of the fluid is sensed at the sensing position. Associated analytic apparatus includes first and second pumps (1, 2). The first pump has a pair of ports and the second pump has at least one port. A conduit (4, 5) provides fluid flow communication from a first of the ports of the first pump (1) to the port of the second pump (2). A fluid junction (3) in the conduit (4, 5) is spaced from the second pump for admitting a further fluid to the conduit. A sensor (13) is associated with the conduit (5) to sense a condition of the fluid in the conduit at least at a sensing position between the fluid junction (3) and the second pump (2). The first and second pumps (1, 2) are respectively operable to deliver a first fluid to the conduit at a controllable first rate and to draw fluid from the conduit at a rate greater than this first rate, whereby to aspirate further fluid into the conduit at the fluid junction.