MAX sensor is calibrated against off line measurements of cell yeast dry cell weight A smooth calibration curve is shown over multiple fermentations for yeast dry cell weights up to 60 grams/liter

The output from the MAX instrument is plotted along with off-line measurements on a PC as shown. Saccharomyces cerevisiea was grown in sequential fed batch cultures to cell densities of 55 to 65 grams dry weight/liter. Upon calibration for dry weight, the MAX sensor is able to provide accurate semi continuous readings of cell density.