Maybe and maybe not.
PSIA makes it explicit that the measurement given is an "absolute" value; that is, its zero point is a complete vacuum.
PSI may be absolute, or it may be given relative to ambient atmospheric pressure.
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The difference between Absolute Presure and Gauge Pressure is 14.7psi. So zero gauge pressure (0psig) = 14.7 psia. 600 psig = 614.7 psia. Calibrate the tranmitter so 4mA is obtained at 14.7 psig and 20mA is obtained at 614.7psig. The span will be 600 psi in both cases.
To convert 2.4 bar to psi (pounds per square inch), you can use the conversion factor where 1 bar is approximately equal to 14.5038 psi. Therefore, 2.4 bar is equal to about 34.8 psi (2.4 bar × 14.5038 psi/bar ≈ 34.8 psi).
14"
Gallon is volume, PSI is pressure. They're different things and don't translate.
Multiply by 0.036 http://www.enercongroup.com/conversion_factors.htm One PSI is equal to 27.7 inches of water column