Energy efficiency and optimal production processes are key success factors especially for small and medium-sized companies. However, unlike IT-systems, industrial machines cannot be exchanged every few years to keep up with state of the art production. At many companies, these machines are often decades old. 20 or 30 year equipment is not uncommon. So how can they keep up with today’s need for increased efficiency? What can companies do, to identify and eradicate problems, thus making the output more efficient? “Retrofitting” is the term summing up the answer. Equipping old machines with new sensors. However, that’s easier said than done.