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Units

Many countries have standardised on Metric units, however this can mean bars/Pascals/Kilopascals/Megapascals/mm etc. There are other units such as Atmospheres etc. The USA still uses the Imperial system (Psi/Inches H2O) . It is suggested that care is taken to ensure that datasheets are referenced to determine the units used.

Also it is a real trap to just look at the outer scale on Pressure gauges as they may have a factor on them, for example X100. Therefore if one is not careful a 100Kpa gauge may in effect be a 10000Kpa unit, with potential catastrophic consequences if the gauge is being used to monitor a pressure vessel test.

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