4.8 Stability with time or drift

When a gas analyzer equipped with semi-automatic adjustment means is operated in accordance with its operating instructions under stable environmental conditions, its error shall remain within the maximum permissible errors (according to 4.3.1) for at least seven days from the moment of adjustment of the gas analyzer using the CGM. If the gas analyzer is equipped with a means for drift compensation, such as automatic zero correction or automatic internal adjustment, the action of these adjustments shall not produce any indication that can be confused with a measurement result of the volume fraction of the components in the analyzed sample.