Novel automated micro batch analyzer

An automated micro batch analyzer (AMBA) system is described. The sample is introduced into an air‐tight reaction chamber (a polypropylene microcentrifuge tube) by a loop injector made from two three‐way valves by flowing gas. Reagents/diluents are introduced into the chamber from pneumatically pressurized reservoirs provided with on‐off valves. A microprocessor‐controlled timer controls valve status and thus provides control of delivered volumes. Gas bubbles are introduced through the bottom of the chamber to perform mixing; the mixed liquid is then discharged into an optical detector via a bubble gate by superincumbent pressure. The bubble gate allows the data‐acquisition system to collect data only when liquid is actually in the detection cell. For simple fast reactions, throughput rates of 210 samples/h could be obtained.