1.5.4. Calibration

Directive 2005/55/EC of the European Parliament and of the Council of 28 September 2005 on the approximation of the laws of the Member States relating to the measures to be taken against the emission of gaseous and particulate pollutants from compression-ignition engines for use in vehicles, and the emission of gaseous pollutants from positive-ignition engines fuelled with natural gas or liquefied petroleum gas for use in vehicles (Text with EEA relevance) · European Union

Each normally used operating range shall be calibrated. Using purified synthetic air (or nitrogen), the CO, CO2, NOx and HC analysers shall be set at zero. The appropriate calibration gases shall be introduced to the analysers, the values recorded, and the calibration curve established according to Section 1.5.5. The zero setting shall be rechecked and the calibration procedure repeated, if necessary.

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Source: EUR-Lex (Cellar) · retrieved 2026-11-01 · Text as adopted (Official Journal); later amendments are not incorporated in this text.