Device for the sequential testing of filters and their use

A device for sequential testing of filters (1), comprising

• a first assembly having an aerosol generator (4) and a first measuring device (5) for determining the aerosol concentration of the air as raw gas, a raw gas-side coupler (3) for connecting to the filter (1) to be tested, wherein the raw gas-side coupler is connected via a first shut-off valve (6) to the first assembly and to a non-return valve (11),
• a clean gas-side coupler (2) for connecting to the filter (1) to be tested,
• a second assembly comprising a device (7) for sucking in air in connection with a second measuring device (8) for determining the aerosol concentration of the air as a clean gas downstream of the filter (1), which is connected via a second shut-off valve (9) to the clean gas-side coupler (2), so that the volume flow is brought about on the clean gas side of the filter (1) and, when the coupling is closed at the filter (1), aerosol is sucked through the feed lines from the aerosol generator (4), and
• a control device in connection with actuating devices of the shut-off valves (6, 9), where the shut-off valves (6,9) do not have a common drive,
• wherein the couplers (2, 3) are connected to the filter (1) and the shut-off valves (6, 9) are opened and the first assembly, the filter (1) and
• the second assembly thus are connected to one another for testing the filter (1), the first shut-off valve (6) is closed in succession after the testing of the filter (1) and before the opening of the couplers (2, 3), so that the non-return valve (11) opens and ambient air flows through the non-return valve (11) in the raw gas-side coupler (3), and the second shut-off valve (9) is then closed so that no ambient air can flow into the clean gas-side coupler (2), the couplers (2, 3) are opened by the tested filter (1) when the shut-off valves (6, 9) are closed, and
• the couplers (2, 3) are connected to the next filter (1) to be tested, such that the first line (12) is already filled with an aerosol when the next filter (1) is tested.