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Title: Combined Accuracy
Author: Rex C. Allen
Source: 2019 Western Gas Measurement Short Course
Year Published: 2019
Abstract: We use the term Combined Accuracy to define the error in both the meter and the instrument in a single figure. This figure also helps us stay within rules/regulations or Company policies requiring us to measure within a defined overall error tolerance. We all want to provide our customers with a bill that accurately depicts their usage, no more, no less. Using Combined Accuracy allows us to get there by accounting for known error in both pieces of our measurement equipment. The typical gas meter setup found in residential or low volume commercial customers consists of a standalone meter. Since there is only one measuring device, there is no combined accuracy calculation. The meter accuracy, by itself, dictates its measurement accuracy via the meters check proof. Combined Accuracy comes into play usually with your larger, high demand commercial applications where an Electronic Volume Corrector is employed with the gas meter. We now have two measurement devices working in tandem. With two measurement devices, we have two accuracy points to contend with.

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