Requirements for different types of particulate emission monitoring has evolved over the past 20 years to satisfy three important trends:
1) The increasing importance and variety of type approvals and certification schemes such as MCERTS and TUV.
2) The application of BAT (best available technology) to monitoring approaches which means that feedback on particulate filter condition is required in certain processes while absolute measurement is required in others.
3) The wide adoption of bagfilter type arrestment plant whose operation can be optimised by new types of performance monitoring.