The ULTRAMAT 23 is an innovative multi-component gas analyzer for measuring up to three infrared-sensitive gases using the NDIR principle. Measurement of oxygen (O₂) is also possible through the use of electrochemical oxygen sensors or measuring cells operating according to the paramagnetic principle ("dumbbell"). The use of an additional electrochemical H₂S measuring cell permits use in biogas applications.

Up to 4 gas components can be measured simultaneously with the ULTRAMAT 23 gas analyzer: up to three infrared-active gases such as CO, CO₂, NO, SO₂, CH₄, and additionally O₂ with an electrochemical oxygen measuring cell.