EPA does accept thermal flow meters for measuring volumetric flow rate of LFGs?
Thermal mass flow meters may be used to comply with the monitoring requirements of the rule provided they meet the accuracy requirements under section 98.3(i). Calibration should be done as specified by the manufacturers if none of the methods listed in section 98.344(b) or (c) are applicable. We are considering our options for providing clarifications to the regulatory text in the future.
