From American Sensor Technologies, Inc. - AST
Differential pressure measurement is the difference in pressure between two points in a system. For filtration applications, the upstream side [A] is positioned before the filter [B], whereas the downstream side [C] is after the filter. A differential pressure sensor can be used to monitor the cleanliness of a filter in either liquid or gas applications.
How It Works
1. The upstream pressure (commonly referred to as the line pressure or influent pressure) drives the media through the filter. A line is installed before the filter, as well as connected to the High side of the sensor.
2. The filter then removes contaminants from the media.
3. Next, the downstream pressure or effluent pressure, leads the media through the system with fewer contaminants than before. A line is installed on the Low side of the sensor in order to monitor the differential.
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