Engie Power Station Rotterdam has been taken into operation only a few years ago. It has been erected by Mitsubishi Hitachi Power Systems of Duisburg/Germany. The Power Station was equipped with a Delta P measurement for all the primary air flows. Due to the constant drift problems on one hand and the convincing digital technology of PROMECON for measuring air flows the stations has now decided to switch over and replace all primary air flows with the PROMECON McON Air systems. The new measurements will be installed in due course.