Sempore Method – Simple Air Sampling
The method works as well on air as liquid. It is now used both for research purposes and for different types of air quality control measurements. Examples of this are quality assurance of supply air in fan controlled ventilation systems and for the determination of particulate pollutants in indoor air in connection with “sick house investigations”.
The filter installations found on most ventilation systems are such that they are able to stop the large particles contained in the air such as, for example, pollen, but the smallest particles pass through them.
The simple air sampling which takes place by means of a filter electrode, the so-called measuring stump, is one of the most important advantages of the Sempore method. Partial pollutants in the air are captured on a patented filter holder provided with a flat membrane, a nucleopore filter, on the upper side.
Particles down to 0.1 μm are concentrated on the filter holder either by air suction through the membrane with a pump or by electrostatic enrichment with the Airpoint air ionizer.
In order to facilitate the practical and safe handling of the filter holders to be sent for analysis, a storage carousel for 10 filters has been designed.
For the air sampling, a pump with a constant airflow of 1,0 l/min is used under 25 min as standard measurement. A typical measurement takes place on several points, usually on four measuring points. By comparing the results with each other and with a sample of the outdoor air as a reference you can localise the source of the problem.