Today the vast majority of fermentation vessels are made of stainless steel whereas in the past open fermentation in wooden vats was common. The temperature of the fermenters has to be controlled in order to ensure optimum conditions for the yeast strain used. Adjusting the temperature at the end of the fermentation and in the storage cellar helps to remove turbidity causing particles and to ensure reliable brews.
Yeast strains are cultivated separately for each type of beer under optimal conditions as starter cultures for different beer yeasts. Basically there are two different types of yeast: bottom and top fermenting for lager, pils, resp. ales and wheat beer.
Yeast, either form the propagation tank or harvested yeast from a previous fermentation, is pitched into the wort. Goal is to always have the same amount of viable yeast cells in a fermenter in order to make the process reliable and plannable.
After consuming the dissolved oxygen the metabolism changes to anaerobic leading to the formation of mainly alcohol and CO2. At the end of the fermentation only trace levels of dissolved oxygen are left.
Separator After Fermentation
After fermentation the yeast cells are separated from the beer. As the separation process might lead, especially at the beginning, to an uptake of dissolved oxygen, monitoring the low DO content is crucial for the stability and flavor of the final beer.
In order to get independent from external CO2 suppliers and to optimize the carbon footprint CO2 generated during fermentation is recovered and purified for further use to compensate losses during filtration or for removing air out of empty bottles, cans or kegs.
App Note - Portable DO measurement in craft brewing industryRiders Brew, a well known craft brewery outside of Melbourne, Australia, uses Beverly uses Beverly at many process steps to ensure highest beer quality.
App Note - Portable DO tested by SABMillerSABMiller, those days the world's second biggest brewery group, compared the portable device Beverly with competitors products in their research brewery in Nottingham, UK.
App Note - Portable DO measurement at various process stepsSt Austell brewery, well known in southwestern UK for their excellent beers, uses Beverly to measure dissolved oxygen at different process steps.
We're Ready to Help
Hamilton's sales, customer service, and technical support staff are available for questions and additional information about all products and services.Contact Us