Orifice Meter 4 : Instrument used to measure fluid flow by recording differential pressure across a restriction placed in the flow stream and the static or actual pressure on the system. (WT)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}