monitor version of OPSIS’ SM200 particulate monitor provides accurate and reliable automatic measurements of PM10
particulate fraction concentrations in ambient air, as well as sampling of the PM10
particulate fraction for subsequent manual analysis.
To separate the PM10
fraction, a pump drives a well-controlled flow of air through a standardized inlet head at a rate of either 1.0 or 2.3 normalized cubic metres per hour. The sampled air then passes through a 47 mm filter; typically made of Teflon but it can also be made of glass fibre or cellulose. During the sampling process, the particles are accumulated on the filter. Finally, after sampling, the weight of the particles collected on the filter is measured using the well-known beta attenuation method
. The weight combined with the total volume of air passing the filter during sampling gives the average particulate concentration during the sampling period. The filters are preserved after sampling, allowing subsequent analysis of the specific composition of the particulate matter, typically revealing information about air-borne cadmium, nickel and other metals.
Quality assurance and quality control is an integral part of the SM200 design. It is applied automatically and secures reliable monitoring results with high accuracy and precision. The robust design of the instrument and track records from many years of practical operation in challenging environments, both with respect to temperature and particulate concentrations, vouch for trouble-free use with only a minimum of maintenance required.
The SM200 instrument is often combined with OPSIS gas analysers
and other sensors to form a complete ambient air quality monitoring
station, but it can also be used stand-alone on its own merits. Versatile communication options allow easy system integration and accurate data extraction and remote supervision of the instrument.
monitor is just one version of the SM200 instrument. It also exists in versions for PM2.5
monitoring, for stability monitoring, and as a pure particulate sampler.
The SM200 instrument meets new regulations on dust sampling on filter membranes for further analysis. The OPSIS PM10
monitor has been tested and approved
by a number of internationally recognized institutes and authorities, such as U.S. EPA
, German TÜV
and British MCERTS