These piston volumetric water meter are a instruments which directly measure the volume of the fluid and divide it into separate volumetric spaces with known volumes. By multiplying the number of gradually filled volume spaces by the volume of each space, we get the value of flow. It is always measured over a period of time, and the result is the value of a unit of volume in a unit of time. Volume flowmeters usually show the total flow through the counter, but also allow the generation of output pulses, each pulse represents a certain volume of fluid. Pulse numbers can be read or transmitted from the local display to the control system.
