Automatic chemistry analyzer.

摘要

An automatic chemistry analyzer includes a flow cell (17) mounted so that flow (18) through the cell and tubing connected to the cell is visible from the front of the housing. The electrodes (21-26) to the cell are removably plugged into the cell from their rear. The probe (32) aspirating sample fluid into an injection cell (28) is simultaneously washed by diluent and the diluent mixes with the fluid sample. Waste fluid from the flow cell (17) is fed to a basin (34) which then feeds under gravity to a waste drain (51). A ratio pump (65) is formed by selected syringes (72-74) which are band driven to deliver accurately prerequisite volumes of reagents to the flow cell (17). The solution ground (93) to the system is on the fluid line adjacent the entrance to the flow cell of fluid (19) thereby minimizing electronic noise. Only two motive means are necessary, one to effect horizontal and rotational movement of the sample tray, and a second to effect vertical motion of a crane (31) mounted probe (32) operative between sample cups (33) and an injection cell (28).