Turbidostat
A turbidostat is a continuous culturing method where the turbidity of the
culture is held constant by manipulating the rate at which medium is fed.
If the turbidity tends to increase, the feed rate is increased to dilute
the turbidity back to its setpoint. When the turbidity tends to fall, the
feed rate is lowered so that growth can restore the turbidity to its setpoint.
Sketch of Turbidostat
The problem of growth or other materials fouling the optical surfaces
of what ever method is used to measure turbidity has not been solved. While
a turbidostat may operate well for a brief time, the control signal for
turbidity soon becomes unreliable.
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