PRUEFVORRICHTUNG ZUM PRUEFEN DER LUFTDURCHLAESSIGKEIT VON FLAECHIGEN GEGENSTAENDEN, INSBESONDERE VON FILZEN UND SIEBEN FUER DER PAPIERHERSTELLUNG DIENENDEN MASCHINEN ODER ANLAGEN.

摘要

The device has a measuring channel (20) written an annular air flow channel (18) each coupled to a fan and applied to the surface of the filter (24). The measuring channel (20) contains the turbine wheel (29) of an anemometer (30) for measuring the volumetric flow and a sensor for detecting the static press. A regulating circuit maintains a constant press. difference between the static press within a cylindrical section (22) of the measuring channel (20) and the surrounding atmospheric press. Pref. the measuring channel (20) has a tapering section behind the cylindrical section (22) with a conical taper at an angle of between 10 and 15 degrees.