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Changes over time for: Division
3.3.
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Timeline of Changes
This timeline shows the different versions taken from EUR-Lex before exit day and during the implementation period as well as any subsequent versions created after the implementation period as a result of changes made by UK legislation.
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Version Superseded: 02/01/2013
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EU Directives are published on this site to aid cross referencing from UK legislation. Since IP completion day (31 December 2020 11.00 p.m.) no amendments have been applied to this version.
[3.3. Oxygen interference check and recommended limits U.K.
The response factor (Rf) for a particular hydrocarbon species is the ratio of the FID C 1 reading to the gas cylinder concentration, expressed as ppm C 1 .
The concentration of the test gas must be at a level to give a response of approximately 80 % of full scale deflection, for the operating range. 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 between 293 K and 303 K (20 ° and 30 °C).
Response factors should be determined when introducing an analyzer into service and thereafter at major service intervals. The reference gas to be used is propane with balance purified air which is taken to give a response factor of 1,00.
The test gas to be used for oxygen interference and the recommended response factor range are given below:
Propane and nitrogen 0,95 ≤ Rf ≤ 1,05.]
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