The ULTRAMAT 23 is highly innovative and space-saving due to its multi-component structure with NDIR technology for electrochemical cells of O2 and H2S measurement (optional) and for a maximum of 3 IR active constituents measurement. Some benefits of using this device are high selectivity due to multi-layer detectors, menu-assisted operation in plain text, open interface architecture (RS 485, RS 232; PROFIBUS, SIPROM GA): streamlined process integration; remote control and operation, cleanable sample cells which are cost-saving via reusing after contamination, and is very practical because of the eliminated need for calibration gases (AUTOCAL with ambient air, dependent on the measuring component).