Estimating uncertainty of flow measurement for the in-situ calibration of large water meters

Abstract

A methodology for the establishment of an in-situ calibration approach that makes measurement results more accurate has been determined from previous research. The quality system derived for this in-situ calibration approach facilitates confidence by stakeholders in the statements of uncertainty of flow measurement for existing large in-line water meters. The quality system is outlined in a quality manual that is the core document used for the purposes of obtaining accreditation from a country’s national accreditation body. Some important components of uncertainty of measurement have been identified, as well as guidance as to how they can be minimised when applying the in-situ calibration methodology. When the regular in-situ calibration of large water meters is included as an integral part of sustainable water management practice, the benefits will include minimising non-physical (apparent) water losses, improved financial accountability and optimal decision-making.