Metering Separator : A vessel which measures liquid after separating of gas, usually by means of a positive volume chamber which dumps a measured volume of liquid each time chamber is filled. (WT)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}