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Title: Terminology Used In Instrument Accuracy
Author: Rick Williams
Source: 1999 American School of Gas Measurement Technology
Year Published: 1999
Abstract: The purpose of this paper is to offer a brief explanation and discussion of many key terms used in describing instrument accuracy. The terms included within this discussion are most commonly used for defining performance standards with primary sensing elements typically used in the measurement of flow, level pressure and temperature instruments. Many of the terms used may apply to controllers, recorders and final control elements. However, the focus provided herein is the primary element device. The specific devices include transmitters (differential pressure and temperature) and flow meters (e.g. magnetic, vortex, turbine, variable area and positive displacement). This paper is written for the benefit of the typical user of instrumentation products to include instrument engineers and technicians. A comprehensive discussion of precision measurement must address calibration and traceability issues. The scope of this paper will be limited to discussing the terms associated with the application of instruments rather than addressing the issues of maintaining accuracy. Calibration is a key issue in determining the continuous performance of an instrument and is worthy of discussion. However, it is complex enough to warrant separation from this discussion.

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