OIML R 144-2 • Test procedures

1.2 Error determination

For a linear calibration characteristic, the error of a gas analytical system shall be determined for at least three points within the measuring range and sub-range. It is recommended to use calibration gas mixtures (CGM) with the following values of volume fractions for the components to be determined:

  • minimum value of the measuring range ;

  • average value ;

  • maximum value of the measuring range .

For a nonlinear calibration characteristic, the error shall be determined for at least five points uniformly distributed within the measuring range and sub-range.

Measurements at each point of the measurement range shall be repeated at least three times, and no errors shall be greater than the specified limits.