Arrangement for testing a flow meter

摘要: An arrangement for testing a flow meter which issues first train of pulses in response to the rotation rotatable member thereof includes measuring cylinder-and-piston unit that has cylinder, piston slidably received cylinder and displacing known comparison volume fluid out delivery meter, rod extends exterior cylinder. A photoelectric sensing is mounted on joint movement therewith along stationary scale scan distancing markings such issue second detection thereof. so situated encounters same only after covered an initial distance corresponding running-in piston. lug with countermarkings interposed light path mask unmask thus achieve pronounced light-dark effect. The pulse triggers counting are correlated number revolutions correction made termination test run fractions occurring at beginning end run.