In this example, we see a remote seal system with a fill fluid having a density of 58.3 lb/ft
3
, and
a process level measurement range of 0 to 11 feet of sea water (density = 64 lb/ft
3
). The transmitter
elevation is 6 feet, which means it will “see” a vacuum of −2.43 PSI (−67.2 inches of water column)
when the vessel is completely empty. This, of course, will be the transmitter’s calibrated lower range
value (LRV). The upper range value (URV) will be the pressure “seen” with 11 feet of sea water in
the vessel. This much sea water will contribute an additional 4.89 PSI of hydrostatic pressure at the
level of the remote seal diaphragm, causing the transmitter to experience a pressure of +2.46 PS
In this example, we see a remote seal system with a fill fluid having a density of 58.3 lb/ft3, anda process level measurement range of 0 to 11 feet of sea water (density = 64 lb/ft3). The transmitterelevation is 6 feet, which means it will “see” a vacuum of −2.43 PSI (−67.2 inches of water column)when the vessel is completely empty. This, of course, will be the transmitter’s calibrated lower rangevalue (LRV). The upper range value (URV) will be the pressure “seen” with 11 feet of sea water inthe vessel. This much sea water will contribute an additional 4.89 PSI of hydrostatic pressure at thelevel of the remote seal diaphragm, causing the transmitter to experience a pressure of +2.46 PS
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