Pressure Measurement: Understanding PSI, PSIA and PSIG

pressure measurement is all about PSI. That ’ randomness because pounds per square column inch ( PSI ) is the most common unit for measuring pressure in the U.S. It ’ second important to understand what PSI means and how it is used, as imperativeness measurement is an important part of liveliness in the twenty-first century. For example, you need to make sure that your car tires or bicycle tires are inflated to the proper PSI before you drive or ride, and today, equipment of all types includes pressure sensors or gauges to assist in monitoring and diagnostic operations. furthermore, scores of careers, ranging from civil and mechanical engineer to meteorologist to refinery pressure instrumental role technician, besides involve understanding and using imperativeness measurements as a part of their daily activities .

Getting a Grip on Pounds per Square Inch — PSI

Pounds per squarely inch is the unit of coerce used the huge majority of the meter in the United States for family, commercial, or industrial equipment. early countries bill imperativeness in different units. In scientific context ( physics labs and therefore forth ), atmospheric pressure is typically measured in a lot smaller units called pascals ( named after french physicist Blaise Pascal ). For reference point, 1 PSI equals 6,894.76 pascals. pressure measurement instruments such as pressure gauges and sensors typically display measurements in PSI. Two frequently used variations of PSI are PSIA and PSIG.

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Pounds per Square Inch Gauge – PSIG Vs. Pounds per Square Inch Absolute – PSIA


PSIG is the condition for pressure specified by a gauge or other pressure measurement device. It gives the remainder between the press in a pipe or tank and the press of the atmosphere ( asynchronous transfer mode ).


PSIA is a condition that describes the absolute pressure in PSI, including the pressure of the atmosphere. absolute atmospheric pressure is besides sometimes referred to as “ sum pressure. ”

Examples of How to Calculate PSIG and PSIA

note that PSIG is constantly lower than PSIA. The formula to describe the kinship are : PSIG + 1 cash machine = PSIA and PSIA – 1 cash machine = PSIG ( where asynchronous transfer mode is atmospheric pressure ). It is easily to calculate PSIA or PSIG or convert between the two. You can use the actual atmospheric blackmail value for your location if it is available, or you can besides use 14.7 pounds per square inch ( the approximate atmospheric pressure at sea level ) as a standard value to convert PSIG to PSIA and vice versa. ( Unless you live at gamey elevation or in a deep valley, the ocean level value will work. ) In early words, since atmospheric pressure at sea level is 14.7 PSIA, you subtract the PSIA of 14.7 from an cash machine pressure of 14.7 to equal zero PSIG ( 14.7 ( PSIA ) – 14.7 ( asynchronous transfer mode ) = 0 ). As an example, absolute press at ocean grade is 14.70 PSIA and absolute pressure at an natural elevation of 1,000 feet is 14.18 PSIA. At the higher elevation there is less pressure, sol if an absolute pressure gauge is read at a 1000-foot elevation, its readings will be close to .5 PSI ( 14.70 – 14.18 = .52 ) less than those from a standard press gauge. WIKA ’ s knowledgeable technical staff is more than happy to answer any questions you may have about PSI, PSIA, PSIG or atmospheric pressure measurement. We can be reached by earphone or electronic mail, and promise a immediate answer .

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