The CellTrol II control module monitors bioreactors process values and performs PLC (Allen-Bradley Programmable Logic Controller) based process control. A touch screen operator interface provides access to all PLC based control functions and allows viewing and modification of control parameters. Signals types include temperature, pH, DO, speed, and foam/level. PLC control drives the inc/dec outlets assigned to each channel as well as to pumps mounted on the front of the unit. The pump assignments are user defined from the operator interface. Cell-Soft Software are also available. Optional tethered speed drive, optional single support flow station and weight platforms are sold separately.