Know the Difference between Gauge Pressure and Absolute Pressure

Bits and Pieces: Fluid Power Fact #3

Know the Difference between Gauge Pressure and Absolute Pressure

Two pressure scales are utilized to measure pressure values in fluid power systems: a gauge scale and an absolute scale. The gauge pressure is the pressure indicated by a pressure gauge. It is a measure of the pressure with reference to the atmospheric pressure (1.013 bar or 14.7 psi) and it is not with reference to the absolute vacuum. Therefore, it does not include the pressure exerted by the atmosphere. The zero gauge pressure corresponds to one atmospheric pressure. The absolute pressure scale begins at the point where there is complete absence of pressure (zero absolute pressure).

The gauge scale is represented with a ‘g’ suffix to the unit or with no suffix at all {for example, bar(g) or bar} and the absolute pressure scale is always represented with an ‘a’ suffix {for example, bar(a) or psi(a)}.

Gauge pressures may be converted to absolute pressure by adding the atmospheric pressure to the gauge reading. Absolute pressures are to be used, for example, in calculations using gas laws. The relationship between absolute pressure and gauge pressure is illustrated graphically in the figure.

GaugePressure

Logo Ai(2)


Comprehensive Training in Pneumatics and Hydraulics!!


Fluid power technology is fascinating as ever!! It may take many more years to have uniform approach towards evolving product lines so that manufacturers and end-users have a common ground.

Fluidsys Training Centre, Bangalore is striving to meet the challenge with a systematic training in the field of Pneumatics and Hydraulics.

Fluidsys Training Centre, Bangalore will be conducting six-week long-term training program on ‘Professional in Pneumatics and Hydraulics – Advanced level with TUV Rheinland Certified Qualification’* from this academic year (2018-19) onwards, apart from the regular short duration (3 to 4 days) courses.

[*Approval from TUV Rheinland is awaited].


Please contact:


Fluidsys Training Centre Pvt Ltd, Bangalore

07338385505 | 080-29729505

Email: info@fluidsys.org

Website: https://fluidsys.org

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

WordPress.com.

Up ↑

%d bloggers like this: