Pressure Gauge Calibration Essay

587 Words3 Pages
Introduction Calibration is a fundamental aspect of metrology. Calibration provides the accuracy of an instrument in relation to a higher standard. The National Institute of Standards and Technology (NIST) laboratories provide the measurements, regulations, and standards needed for calibration in US industries. Calibration is essential for instrumentation and equipment in order to ensure that the item is functioning the way that it was designed to. Many factors such as environment, usage and stress influence the accuracy of the equipment/instrumentation. As a result, calibration is never an option but rather a requirement. The process of pressure gauge calibration will be examined in this paper to show its relation to one of Deming’s Funnel Experiment rules. Background Deming’s Funnel Experiment was designed to show that adjustment is not necessary for a process that is stable or in control. Over adjustment can lead to poor results and can make the process unstable. The procedure for Deming’s funnel experiment was to drop marbles down a funnel to hit a target as illustrated in Figure 1 below. Deming’s Funnel Experiment consists of 4 rules, of which one (Rule #2) will be covered as part of this discussion. In Deming’s second rule, the funnel is set over a fixed spot above the target. After each drop, the funnel is adjusted an equal distance from the target but in the opposite direction. See simulation in Figure 2 below. Hypothesis Pressure gauge calibration follows Deming’s Rule #2. Discussion Pressure gauge calibration is typically performed two times for the instrument. The pressure gauge is evaluated at 5-10 different pressure locations on the scale. Each pressure point is measured at rising and falling applied pressures. A rising pressure is attained by starting at zero applied pressure and moving up to the
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