Division 6.2 Calibration gasesF1

The true concentration of a calibration gas shall be within ± 1 per cent of the stated value or as given below, and shall be traceable to national or international standards.

Mixtures of gases having the following compositions shall be available with bulk gas specifications in accordance with paragraphs 6.1.2.1. or 6.1.2.2.:

1. (a)

   C₃H₈ in synthetic air (see paragraph 6.1.2.2.);

2. (b)

   CO in nitrogen;

3. (c)

   CO₂ in nitrogen;

4. (d)

   CH₄ in synthetic air;

5. (e)

   NO in nitrogen (the amount of NO₂ contained in this calibration gas shall not exceed 5 per cent of the NO content).