Bourdon gauges are relative in that they read the difference between the inside

Question

Bourdon gauges are relative in that they read the difference between the inside and outside pressure. It assumes outside pressure is 1atm (=14.7psi), then add the difference between the inside pressure and outside pressure to 1 atm and displays the sum. In other words, its reading = 14.7psi+(Pin-Pout). A Bourdon gauge is used to measure pressure of a gas tank. The fab is at a high elevation. The atmospheric pressure is at 0.9atm. The Bourdon gauge reads 3psi. What is the pressure of the gas tank?

Explanation / Answer

Bourdon gauge reading = Patm + ( Pin - Pout)

Patm = 0.9 atm = 13.23 psi

3 psi = 13.23 psi + ( Pin - Pout)

Pout = 1 atm = 14.7 psi

3 psi = 13.23 psi + Pin - 14.7 psi

Pin = 4.47 psi

Pressure of gas tank = Pin = 4.47 psi

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