7.2.2.1

Initial verification of a gas analytical system includes an external examination to determine conformance with the approved type, and also compliance with the contents of the set of accompanying documents.

7.2.2.2

After adjusting a gas analytical system according to the routine adjustment procedure described in the operating manual, tests to determine its errors shall be carried out under rated operating conditions at several values over the measuring range.

The tests shall be performed using at least three calibration gas mixtures (CGMs) with values of the volume fractions for components to be determined that are uniformly distributed over the measurement range.

The smallest and the largest values of the volume fraction for components to be determined in a CGM shall not differ from the lower and upper values of the measurement range by more than +10 % and -10 %, respectively.

The uncertainty on the volume fraction for components to be determined in a CGM shall be such that the ratio between the absolute value of the uncertainty of the CGM and the maximum permissible error of the gas analytical system at the given point of the measurement range shall be not more than 1:3. However, the responsible legal authority may allow the ratio 1:2.

The errors observed during the tests shall be within the permissible limits according to 4.3.2 for initial verification at each measurement.