A Microprocessor Controlled Coulometric Titrator

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Abstract
A microprocessor controlled coulometric titrator has been built as a research model and shown to be a versatile and reliable instrument concept suitable for process control applications. Use of the microprocessor gives real-time control over the titration reaction and allows great flexibility over control of titrator sequencing and for processing of resultant information. Sampling is accomplished continuously by means of a ceramic sample valve having demonstrated capability of reliable, accurate and repetitive sampling from a high speed sample loop. Hardware and software design considerations, operator control, and titrator sequencing are described. Performance of the instrument is illustrated with several acid-base and redox titrations.