| 摘要 |
An efficiency indicator for a separation system, such as a water filter, wherein a first volume of fluid is exposed, under a first pressure, to a separation medium and a second volume of fluid is recovered therefrom, under a second, lesser pressure. The indicator comprises a housing including an aperture and a biased piston rod in a tube driven between a first position and a second spaced-apart position by the differential between said first and second pressures when said second pressure represents an undesired loss of medium separating efficiency. The piston rod has a first reflective colored coating at one location on said rod and a second reflective colored coating at a second location. A sphere of optical transparent material is mounted so as to project through the aperture of the housing. The sphere includes an outer portion exterior the aperture for gathering light exterior the aperture and an inner end interior the aperture and disposed adjacent the tube for focusing the gathered light in an area, the area being that occupied by said first colored coating when said piston is in its first position and that occupied by said second colored coating when the piston is in its second position, and for receiving light reflected from a coating and projecting it out through the outer portion thereby providing a clear visual indication of efficiency of the medium.
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