Conventional aerosol generators are used with certain pre-defined settings to generate the required aerosol, e.g. for the testing of filters.
Changes within the aerosol material, the ambient conditions as well as the used settings can change the particle size distribution as well as the concentration, the mass flow, the dosing constancy, the standard deviation of repeatability and the response time of the produced aerosol. Therefore aerosol generators must characterized accordingly.
According to the requirements of the new ISO 16890 a salt generator should be used to measure the ePM 2.5 and the ePM 10 value of filter and filter media.
The difficulty especially for the ePM 10 is to supply enough large salt particles in the size range 7 – 10 µm, as the standard request at least 500 counts in 1 minute.
The regular salt generator AGK 2000 from Palas® was not able to fulfill this statistical requirement. Therefore Palas® started the development of a new salt generator according to the requirements of the ISO 16890 filtration standard
In this paper the new salt generator for the ISO 16890 will be shown on the requirements of the new VDI 3491, as the VDI strongly increases the requirements in the verification of aerosol generator characteristics and will include amongst others the following:
Session: G13 - Particles for Filter Testing
Day: 14 March 2018
Time: 16:45 - 18:00 h