Automatic Control of Dissolved Oxygen Concentration in Stirred Microbial Cultures

SUMMARY: Equipment was developed for the automatic control of dissolved oxygen concentration in microbial cultures, by using the Mackereth electrode as a sensing probe. Factors affecting the choice of components are discussed and the performance of the equipment is described during typical batch and continuous culture runs. The equipment provided precise and reliable control over a wide range of dissolved oxygen concentrations, and retained a high degree of stability over long periods of continuous use.