April 2022

Process Controls, Instrumentation and Automation

Expect the unexpected: Estimation of uncertainty in custody measurement

Uncertainty in input parameters does not have an identical effect on uncertainty in the output.

Uncertainty in input parameters does not have an identical effect on uncertainty in the output. The uncertainty estimation process here reveals this phenomenon with multiple unexpected findings that help to take appropriate mitigative measures to reduce the estimated uncertainty in the output. This paper discusses these unexpected revelations during uncertainty estimation in custody metering systems. When any measurement is made, its outcome depends on the measurement procedures, accuracy of instruments, human and environmental factors, etc. Due to these factors, repeated measurements do not agree with one another, but tend to disperse in a certain band. Any repetition of the measurement wi

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