Online real-time measurement of O2 in biotechnological processes is especially helpful and delivers important information about the acutal status of the culture. No matter if fermentation, bioproduction, scale-up study or else knowing the oxygen concentration directly in the process is essentiel for the success of the process. Oxygen limitations or exceeding certain values can be dected and actions of regulation can be done in time. The measurement principle of BCP-O2ec is an electrochemical principle which can cover - after being calibrated - the whole spectrum of 0-100%vol O2. Like the other sensors of the BCP series it fits on almost every fermenter, every pipe from lab to industrial scale and is very easy to install and needs only few maintenance. BCP sensors can be ordered with aluminium or plastic housing, depending on what you like and where you will apply them.