Instrumentation Laboratory

Philip Spergel

Bernard Stein

A blood analysis system comprises a tempering chamber in which a plurality of flow through measuring cells are disposed. A sensor electrode is associated with each cell. A sample flow path extends from an entrance port through a heater element, a first measuring cell, a control valve, a second measuring cell, a reference electrode interface, to a positive displacement pump. In standby condition, the entrance port is immersed in flush fluid and operation of the pump in such condition flows flush fluid through the entire sample path. Fluid access to either measuring cell is obtainable through the entrance port, auxiliary valve ports, or disconnectable conduits connected to the valve. The control valve is connected in the flow path between the two measuring cells, and in a first condition that control valve places the measuring cells in series fluid communication with the inlet port, and in a second condition isolates the measuring cells from one another so that the electrode systems associated with the two measuring cells may be calibrated concurrently and independently of one another.

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Lexington, MA, United States of America

Philip Spergel