All-fluid differential pressure gauge
Abstract
Abstract A DIFFERENTIAL PRESSURE GAUGE INCLUDES A U-SHAPED TRANSPARENT TUBE HAVING LEGS AT ITS ENDS CONNECTED TO TWO IDENTICAL CLOSED PRESSURE RESPONSIVE ELEMENTS ENCLOSED IN CASINGS TO WHICH CONDUITS FROM TWO DIFFERENT PRESSURE SOURCES ARE CONNECTED. THE TUBE AND PRESSURE RESPONSIVE ELEMENTS ARE FILLED WITH TWO DIFFERENT FLUIDS MEETING AT A MENISCUS IN THE TUBE. A SCALE ADJACENT TO THE TUBE INDICATES THE POSITION OF THE MENISCUS AND PROVIDES A READING OF ANY CHANGE IN POSITION DUE TO CHANGE IN RELATIVE PRESSURES APPLIED TO THE TWO ELEMENTS. TWO IDENTICAL CLOSED EXPANSIBLE PRESSURE RESPONSIVE MEMBERS ARE CON- NECTED TO THE TWO LEGS OF THE TUBE TO EXPAND AND CONTACT EQUALLY WHEN PRESSURE IN THE TUBE CHANGES. VOLUME ADJUSTMENT MEANS MAY BE CONNECTED TO THE TUBE FOR ADJUSTING RELATIVE VOLUMES OF THE FLUIDS IN THE TUBE IN ACCORDANCE WITH ANY DIFFERENCE IN THERMAL COEFFEIENTS OF EXPANSION OF THE FLUIDS IN THE TUBE.
Inventors
- 👤 Frederic Lissau
Bibliographic Details
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