Abstract
A simple device for optimal measurements of the concentration of microbial cells in a bioreactor is described. It consists of a green or red light-emitting diode as light source and a photodiode as light detector. The device can be used for continuous measurements on cell suspensions circulated through a measuring chamber comprised of a tube or viral. The diodes can also be mounted in glass tubes inside a bioreactor for continuous in situ measurements. The use of a biexponential calibration function allows the diode signal to be used to measure cell concentration over a range of more than a factor of 100.
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