A reference instrument is needed to provide the standard against which personal aerosol samplers can be compared and calibrated in real workplaces. Such a calibration tool should provide reference measurements of the inhalable aerosol fraction that are within 25% of those given by an ideal sampler meeting the inhalable aerosol convention given in EN 481.ObjectivesA calibration tool will be designed based around a simplified breathing head and upper torso. Candidate personal samplers will be mounted on the torso of the calibration instrument and their performances assessed by comparing directly the aerosol concentration values given by the personal samplers with those given by the calibration instrument. This will provide direct information on the ability of personal aerosol samplers to measure the inhalable aerosol fraction in actual workplace situations. It will be established, in a range of different workplace settings, that the calibration tool is practical to use for calibrating personal aerosol samplers, and gives results that are understandable for the conditions prevalent at each workplace.
These objectives will be achieved by carrying out the following tasks:
1) specify and design a simple reference instrument to serve as a calibration tool for personal inhalable aerosol samplers;
2) construct and test for electrical and mechanical reliability, three specimens of prototype calibration tool according to the agreed design;
3) carry out tests both in moving air (in a wind tunnel),and in calm air (in a calm air chamber) to confirm that the calibration tool measures the inhalable aerosolfraction and is suitable for use in testing the performance of personal samplers;
4) carry out tests in six different workplaces to assess the practicality of using the calibration tool to determine the performance of personal inhalable aerosol samplers in real workplaces;
5) disseminate the design and operating procedures to as wide an audience as possible to ensure maximum potential for use of calibration tool.
State of progress: The project started in November 1998.
Funding SchemeCSC - Cost-sharing contracts
EH8 9SU Edinburgh
6700 AE Wageningen
171 84 Solna