MAX sensor is calibrated against off line measurements of cell dry weight A smooth calibration curve is shown

The output from the MAX instrument is plotted on a PC as shown. Streptomyces lividans  was grown to a cell density of 20 grams dry weight/liter over 70 hours. Upon calibration for dry weight, the MAX sensor is able to provide semi continuous readings of cell density starting with the inoculation cell density of 2.5 g/l. The MAX instrument also calculates the specific growth rate over the course of the fermentation.