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A positive displacement meter is defined as a device installed in a piping system in which flowing liquid is continuously isolated mechanically into segments of known volume. These segments of liquid are counted as they are displaced and their accumulated total is indicated instantaneously in units of liquid quantity by the meter register. These fixed-quantity liquid segments are united as they emerge from the measuring element, along with the portion of liquid that “slips” through the clearances between the moving parts of the measuring element. This slip, which is an inherent characteristic of a positive displacement meter, must be determined and properly accounted for. Positive displacement meters are generally differentiated by the type of mechanism employed to isolate the liquid segments—in other words, by the nature of their measuring elements.
Humble Pipe Line Co., Houston, Texas.