Process controls

Process controls are the instruments that regulate the physical and chemical conditions inside a reactor or culture vessel, holding variables such as temperature, pH, dissolved oxygen and stirring speed at set points throughout a run. In laboratory and bioprocess work they turn a vessel into a controlled environment, which is what separates a reproducible fermentation or cell culture from an uncontrolled one. The Questpair catalogue carries new, used and refurbished units together: 95 percent of the listings are used. Across the current 429 listings, prices run from EUR 39 to EUR 558.717, a span that reflects how far this class reaches, from a single benchtop temperature controller to a complete bioprocess control system.