PM-350 aerosol photometer is used for on-site leakage detection after the installation of the efficient filter and its system, mainly to check small pinholes and other damage in the filter filter, such as frame sealing, gasket seal and leakage on the filter frame.The purpose of leakage detection is to check the sealing of the efficient filter and the connection part with the installation frame, timely find the defects in the installation, and take corresponding remedial measures to ensure the cleanliness of the area.