An Examination of the Uncertainty of Industrial Deadweight Testers Used for Pressure Calibrations in Different Environments (NCSLI Measure reprint)

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An Examination of the Uncertainty of Industrial Deadweight Testers Used for Pressure Calibrations in Different Environments (NCS (2.53 MB)

 Posted by permission of NCSLI Measure.

The industrial deadweight tester (IDWT) is a dead weight pressure gauge that is designed, built, and calibrated to be used without having to make corrections or calculate pressure. In practice, the level of corrections ranges from no corrections, or relying on the pressure value engraved on the weights, to using the full pressure equation to calculate a reference pressure. The environments in which IDWTs are used also differ. Some IDWTs are portable enough to be used in an open environment, some are used on production floors, and some are used as references in laboratories with a controlled environment. It is not always clear what the uncertainty specifications are for the variety of levels of corrections and environments. This paper carefully examines the levels of corrections made and applies them to an industrial environment, and provides the tools to be able to perform a valid uncertainty analysis in pressure.