Automation microprocess systems

The thesis of this chapter is that standard process control systems - with a few enhancements and in the right configuration - are indeed suited for the task of automating microprocess systems. 

The basic aspects of a control system are the same, independent of the size of the automated system or the type of the controlled process. However, most microprocess systems are operated today with zero or little automation. This is partly due to a lack of adapted sensors and actuators. 

Of course, the first question has to be Why should I automate my microprocess system set-up at all Running it manually is cheaper, easier and has worked for me until now - why should I change ... 

These asp>ects of automation are useftd for microprocess systems also. So the question is how to make a microprocess system automated with adequate effort. 

Can we just use standard process control systems from normal process automation for microprocess systems also Or are there specific requirements for the automation of microprocess systems that aren t encountered in normal process automation ... 

Well, some spedal requirements are indeed caused by the specific properties of microprocess systems. Due to the small volumes, some process values will have very fast change rates that are not easily covered by standard automation solutions. And... 

While automated reactions to process upsets may be less crucial than with conventional processes, in view of the small hold-up volumes involved in microprocess systems, this feature is still desirable in order to prevent damage to the equipment or spoiling an experiment/production run. 

Many more miniaturized sensors and actuators have been demonstrated as prototypes and would be interesting candidates for automated control of microprocess systems. The challenge here is the transition from a laboratory stage to industrial production and stability of the devices. 

Automation of Microprocess Systems for Process Development and Production 173... 

Automation needs sensors and actuators, but in view of the sizes of microprocess systems, commercially available process instrumentation is not really applicable. This is due to their sizes, but also to the dead volumes caused by the macro connections, hence new generations of miniaturized sensors and actuators including appropriate connection technologies will have to be developed. 

SIPROCESS (Figures 8.18) is an open automated modular microprocess system with integrated automation for chemical synthesis in process development and production. This system makes it much easier to use microstructured components. Its modules address all functions required for chemical synthesis metering, mixing and reacting, sampling and pressure adjustment and maintenance. Each module includes sensors, actuators and automation electronics with preconfigured functions. 

The automation of microprocess systems is still in its infancy. However, existing solutions from the automation of large processes - distributed control systems - and from laboratory automation can be adapted and used. 

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