| 摘要 |
<p>The indicator member of the invention consists of a duct (1) open at its opposite ends (2, 3) for location in communication with the air intake and outlet zones of a filter, and containing a slidable piston (5) carrying an indicator strip (6) visible from the outside, said piston (5) being able to slide within the duct (1), between an inner position and a position close to that end opening thereof in communication with the zone in which the air leaves the filter toward the engine, under the action of a pressure difference between the ends (2, 3) of the duct (1) corresponding to the pressure drop which the air undergoes in passing through the filter when the latter is in a state which requires its replacement because of clogging.</p> |
