AQESHOW - Abstract

Abstract Information :

In Europe, the quality assurance of Continuous Emissions Monitoring Systems (CEMS) is largely governed by EN 14181 which was first published in 2004 and revised in 2014.  CEMS are referred to as Automated Measuring Systems (AMS) and there are three Quality Assurance Levels: QAL1 (Certification); QAL2 (Calibration) and QAL3 (Control).  QAL1 requires that the AMS is type-approved, with a suitably low certification range, and that it is acceptable for the given process application.  QAL2 requires that the AMS is calibrated by a third-party accredited test laboratory using a defined Standard Reference Method (SRM); a linear calibration relationship is established between the AMS output and the SRM test readings.  The calibration relationship is checked annually, by the test laboratory, by means of an Annual Surveillance Test (AST).  QAL3 requires regular zero and span checks to be performed by the operator in order to check that the drift of the AMS over time is not excessive, i.e., the AMS remains under control. As Emission Limit Values (ELVs) are lowered under the Industrial Emissions Directive, and the associated Best Available Techniques Reference documents (BREFs) for each process industry, there can be issues with every component of the quality assurance process which is based upon evaluation at the daily ELV.  This presentation will review each element of the QA process and highlight issues associated with low concentration measurement whilst reviewing both existing and potential solutions