| 摘要 |
<p>The present invention relates to an air filter housing (1) having at least one filter chamber (2, 3) for receiving at least one filter unit (F), said filter chamber having an inlet end and an outlet end, and means (18, 19) for measuring particle concentration in the air leaving the filter chamber. According to the invention said measuring means (18, 19) include a row of several particle detectors (20) affixed to a common support (21), means (23-31) for moving said support in a direction perpendicular to said row of detectors, and means for connecting each of said detectors to a counter.</p> |
