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1.8.2. Hydrocarbon response factors

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

The analyser shall be calibrated using propane in air and purified synthetic air, according to Section 1.5. Response factors shall be determined when introducing an analyser into service and after major service intervals. The response factor (Rf) for a particular hydrocarbon species is the ratio of the FID C1 reading to the gas concentration in the cylinder expressed by ppm C1. The concentration of the test gas must be at a level to give a response of approximately 80 % of full scale. The concentration must be known to an accuracy of ± 2 % in reference to a gravimetric standard expressed in volume. In addition, the gas cylinder must be preconditioned for 24 hours at a temperature of 298 K ± 5 K (25 °C ± 5 °C). The test gases to be used and the recommended relative response factor ranges are as follows: methane and purified synthetic air 1,00 ≤ Rf ≤ 1,15 propylene and purified synthetic air 0,90 ≤ Rf ≤ 1,10 toluene and purified synthetic air 0,90 ≤ Rf ≤ 1,10 These values are relative to the response factor (Rf) of 1,00 for propane and purified synthetic air.

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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.