Electrical/visual differential pressure indicator with solid state sensor
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United States of America Patent
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N/A
Issued Date -
Dec 23, 2004
app pub date -
Jul 16, 2004
filing date -
Dec 30, 2002
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A method of determining fouling of a filter includes the use of a differential pressure indicator which has a housing with at least two ports in the housing. One port receives a first pressure, and the second port receives a second pressure. A pressure resistive device is placed between the first port and the second port, and changes its position when the first pressure exceeds the second pressure by a predetermined amount. A magnet is coupled to the pressure resistive device. A digital displacement sensor senses the position of the magnet and is in communication with an electronic indicator. The electronic indicator activates when the first pressure exceeds the second pressure by a predetermined amount, thus allowing determination of filter fouling.
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