Differential Pressure (DP) Flow meters are popular for being relatively simple, reliable and inexpensive. Their
principles of operation are relatively easily understood. However, traditionally there has been a misconception that no
DP meter self-diagnostic capabilities exist and as such only upgrading to newer ultrasonic or Coriolis technology can
help bridge this gap. In 2008 & 2009 a generic Differential Pressure (DP) meter self-diagnostic methodology [1,2]
was proposed to the industry. In this paper these advanced diagnostic principles were applied towards helping provide
end user a newer yet effective, methodology for DP flow meters diagnostics, field proven with experimental test
results. These results form the basis of a comprehensive validation methodology designed to help meter operators
achieve improved confidence on their DP measurement and thereby help lower their operational risks associated with
large measurement uncertainties due to non-compliance. The paper also aims to demonstrate how such new advanced
tools/methodologies can help reduce operating costs (OPEX) by moving towards a risk based predictive maintenance
plan.