This part of EN 14662 is in accordance with the generic methodology selected as the basis of the European Union Reference Method for the determination of benzene in ambient air  for the purpose of comparison of measurement results with limit values with a one-year reference period. The standard describes guidelines for measurements with, and type approval of, automated gas chromatographs. The use of automated instruments givesThis part a different structure compared to the other parts including the procedure for selecting an appropriate automated gas chromatograph by means of type approval tests. Requirements for use in the field are also described. The standard is applicable to measurements of airborne benzene vapour in the concentration range from 0 μg/m3 to 50 μg/m3 (Standardised to 101,3 kPa and 293 K).This concentration range represents the certification range for benzene in the type approval test.