The QuickTON_b^® of LAR Process Analysers AG is an online measurement system for the determination of total nitrogen (TN_b) according to DIN 38409 part 27, ENV 12260 and ISO - TR11905-2. The QuickTON_b^® is suitable for almost every TN_b-measurement in process control or sewage and industrial waste water application. Typical online applications are control of the production (e. g. the chemical and petrochemical industries) and monitoring the influent and effluent of both industrial and municipal waste water treatment plants (WWTP).