28. When the verification of the accuracy of the measurement instruments in accordance with section 27 shows that the volumetric flows of landfill gas as measured by the flow meters or the CH4 concentration measured by the reference CH4 analyzers have a relative error outside the +/-5% range, the promoter must take the necessary corrective actions, such as cleaning or adjusting the sensor on the instruments, as specified by the manufacturer. The promoter must then verify the accuracy of the instruments again.
When the corrective actions taken by the promoter do not, following a new verification, ensure that the instruments can maintain a relative error within the +/-5% range, the promoter must have the instruments calibrated by the manufacturer or by a third party certified by the manufacturer. The calibration must be performed not more than 2 months after the end date of the reporting period for which quantification is carried out.