Patent ID: 7198053
Filing Date: 2007-04-03
Classification: B01D

Abstract:
1. A filter testing device for testing a filter or filter system, said device comprising switching means for enabling and stopping a fluid connection of internal connection lines, external connections, internal volumes which can come in contact with a fluid from a filter or filter system to be tested, and a device housing containing said switching means and internal connection lines, wherein: the switching means and the external connections are in fluid communication via the internal volumes, the switching means have at least an open state in which respective internal volumes can be brought into communication with each other and a closed state in which respective internal volumes can be brought out of communication with each other, said switching means comprising switching valves, the external connections include a filter connection for connecting the filter or filter system to be tested externally to the device housing, a compressed air supply connection through which compressed air is supplied in testing operation, a connection for internal venting, a connection for external venting, and a connection for an external reference tank, the filter testing device includes means for cleaning at least one of said internal volumes, said cleaning means including means for selecting the at least one internal volume to be cleaned from among said internal volumes during cleaning, the filter testing device includes an internal reference tank to be filled with compressed air during testing, and a pressure meter which detects the pressure drop of the filter to be tested, said internal reference tank connected by connecting lines between the internal reference tank and the switching means, and said pressure meter being isolable from other internal volumes for cleaning, and the internal volumes are the connecting lines between the switching valves, connecting lines between the switching valves and the external connections, connecting lines between the internal reference tank and a switching valve, the internal reference tank, and the volumes of the switching valves.