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XRP now offers Differential Pressure Gauges. These liquid filled units can be used to indicate the pressure drop across two different points anywhere in a fluid system.
These gauges can be used on a filter element to indicate the level of contamination build up in the filter. If the filter has a bypass relief valve, the gauge can be used to see how close the valve is to opening or if it actually has opened or not.
Simply route two lines to the gauge, one from the higher pressure inlet side and one from the lower pressure outlet side. The gauge will indicate the pressure difference between the two points. Available in several different mounting configurations, and with or without an electrical switch to use with a warning light or alarm. 0 to 20 PSI differential range is standard. Other ranges are optional.