A gauge pressure (GP) transmitter compares a process
pressure against local ambient air pressure. Example
Industrial Applications: Open tank level, Line pressure,
and Blanket pressure in a tank.
Differential Pressure Transmitter
Differential Pressure (DP) transmitters measure
The Difference between two pressures. They use a
referent point called the low-side pressure and compare
it to the high-side pressure. Ports in the instrument
are marked high-side and low-side.
Absolute Pressure Transmitter
Absolute pressure (AP) transmitter measure relative to perfect (full) vacuum pressure (absolute zero pressure);
therefore, AP transmitters are not affected by fluctuations
in the local atmospheric pressure. All absolute pressure
measurements are positive.
Fieldbus transmitters accurately measure differential, gauge, or absolute pressure.
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