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Pressure Gauge Terms

Absolute Pressure – A total absence of pressure, indicated by zero. On a pressure measure scale, absolute pressure is typically denoted by the suffix “a” (e.g. psia).

Atm (Atmosphere) – A pressure measurement unit.

Atmospheric Pressure – The air pressure at sea level in standard weather conditions, which is produced by the atmosphere of the earth. Atmospheric pressure is approximately 14.7 psia (29.9” Hg).

Bourdon Tube – A thin-walled elastic tube that is flat and formed into a circular shape, which straightens in response to increases in pressure. Bourdon tubes are fixed to a pressure recording or indicating device such as a gauge.

Case – The housing of a gauge that protects and supports its measuring elements and other internal mechanisms.

Coil Syphon – A coiled length of pipe, typically used on a dead-ended steam line, that acts as a water trap to disperse excess heat. Coil siphons prevent pressure gauges from being exposed to excessive heat transfer.

Dialface – The component of a gauge upon which a graduated scale is printed. The pointer of a dialface indicates a measurement reading.

Pointer – The part of the gauge that works with the dial to indicate the pressure level.

Pointer Indication Adjustment – Modifying the indication of an adjustable needle with the change being the same over the whole scale.

Pressure Relief Plug – The insertion of a plug in the wall of the gauge that vents when there is an element leak in the case of excess pressure build-up.

Proof Pressure – The highest pressure a gauge can maintain with no apparent alteration in accuracy.

Psig (Pounds Per Square Inch Gauge) – Pressure indicated by a gauge, as referenced to ambient air pressure (atmosphere).

Pulsation –A periodic pressure swell.

Repeatability – The highest difference from any two or more successive indications for identical working conditions and applied pressure.

Restrictor – A device that limits the flow of fluid between the pressure element and the source of pressure.

Ring – The part that firmly fixes the window to the case of the gauge.

Rupture Pressure – The highest pressure that the pressure element can hold.

Scale – The markings on the dial of a gauge comprised of gradations, related numbers and units of measure.

Snubber – An apparatus for the reduction of the effect of pressure variations and surges.

Socket – Also called a “stem,” it is the major supporting element of the pressure component assembly to which the elastic component is fixed.

Temperature Error – The alteration of pressure indication that is caused by the difference of temperature in the components from the temperature at which they were calibrated.

Wetted Part – Any surface of a gauge that directly contacts the pressure media.

Window – A clear component made of glass or plastic closing the front of the case of a gauge.