A modular instrumentation system for monitoring and control of biochemical processes, and in particular of fermentation processes is provided. The system includes a plurality of function monitoring and control modules each including a microprocessor and associated memory devices, manual input devices and an interface for the receipt of sensor signals and the transmission of control signals. The modules for a plurality of functions have substantially common design and are adapted for relatively quick conversion to another function. The system may include an instrument console adapted to receive a plurality of the function monitoring and control modules as well as incorporating provision for sensor inputs, power inputs, one or more recorders, one or more pumps and/or an interface for an external computer. The back plane of the console is provided with a conductor array interconnecting the various modules, power supply, pumps, recorders, sensor inputs and external computer interface and incorporates provision for the plug-in connection of the respective modules therewith.