The technique of automated discontinuous programmed flow analysis Is described, together with a working prototype Instrument employing syringe pumps driven by Interchangeable cams. This technique relies on the cyclic generation of flow profiles for both a suction and a discharge pump, such that at various times sample only, reagent only, or a predefined combination of the two Is conveyed via a mixing chamber to a detector. Different cam profiles allow a number of direct reading or reagent addition analysis methods, as well as both single and dual flow titrations. Results are presented for argent ometrlc titrations of chloride In water using as detectors anodized silver microelectrodes contained In two alternative mixer/sensor assemblies. In the range of 60-160 mg/L, precision for analysis times of 30 s or less is typically better than 1 %, with sample consumption of 0.9 mL. Accuracy for chloride determinations In city water samples Is limited by the characteristics of the electrodes to ca. 2-3 %. Cycle times for this Instrument are selectable from 6 to 90 s. Carryover from sample to sample Is negligible because of the incorporation of a sample flush step to commence each cycle. The operating characteristics of this analyzer were studied by using a conductivity detector, and pump displacement precision Is better than 0.1%.