This document specifies requirements of construction and minimum requirements of performance characteristics of automated measuring systems for single measurements of nitrogen monooxide and nitrogen dioxide in the field of stationary source emissions. It also details the procedure of instrumental suitability tests. Measuring systems which have these performance characteristics and which were granted the DiN Testing and Inspection Mark may also be used for individual measurement within the framework of administrative regulations, e.g. for measurements carried out according to the Technical Instruction on Clean Air (TA Luft).#,,#