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Title: Terminology Used In Instrument Accuracy
Author: Claude A.Winslow
Source: 1998 Gulf Coast Measurement Short Course (Now called ASGMT)
Year Published: 1998
Abstract: The terms used with calibration instruments became a study within themselves with the development of the digital calibration instruments used by the gas and gas liquid industry. To begin our study of terms used with measurement instruments a short refresher on gas laws might help to understand something about the outcome or differences seen from the calibration output and the actual flowing outputs from the measurement equipment whether pneumatic or electronic. What relation does pressure and temperature have on volume? The determination of the volume or mass of gas existing at a given set of pressures and temperature conditions is fundamental to gas measurement. The relationships of the values of pressure and temperature quantities and the relationship with each other are known as gas laws. With gas costs increasing the accuracy of measurement is directly related to the accuracy of the conditions making up measurement and the gas behavior. The three most common gas laws are: Boyles Law V,P, VP with temperature remaining constant, or the volume of gas is inversely proportional to pressure using Charles Law. Charles Law states VT - VT,, with pressure held constant. With the pressure constant the volume of gas varies directly with temperature. The Combined Law pV/T PjV/T, shows the results common where temperature and pressure conditions affecting the gas will change. Because of this change, and the need to determine the new volume under the varying conditions, consideration must be accounted for with the effects of both Boyles and Charles Law. There are other gas laws affecting the properties of gas and gas measurement, but for this paper the three laws are brought to the readers attention only to add depth to the understanding of accuracy terms.

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