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United States of America Patent
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Apr 22, 1986
Grant Date -
N/A
app pub date -
Apr 11, 1984
filing date -
Aug 13, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Apparatus for providing an indication of the level of contaminant in a fluid includes a pervious barrier (12) disposed across a fluid path (11) so that the barrier (12) will be progressively blocked by contaminant in the fluid. Monitoring means responsive to the rate of blocking of the barrier provides an indication of the level of contaminant in the fluid. The monitoring means may be means for sensing measurements representing the rate at which the pressure of the fluid upstream of the barrier (12) rises. Alternatively the monitering means senses measurements representing the rate at which the flow rate of fluid through the barrier (12) falls. The provision of an indication conveniently completes a measurement cycle and there is means for renewing the barrier, either by back-flushing the barrier (12) or alternatively by exchanging one barrier for another.
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