Measurement principle: zirconium oxide oxygen sensor. Measurement parameters: excess oxygen and residual combustibles. Application: flue gas. Advantages: it is perfectly suitable for aggressive and nonpurified gases, automatic calibration and verification, easy installation, suitable for temperatures up to 1900°C. Regulatory documents conformance: comply with EMC Directive 89/336/EEC, 73/23/EEC LVD (low voltage equipment Directive) (overvoltage category II, contamination level 2) and PED 97/23/EC for pipes DN<25.