Patent ID: 8286480
Filing Date: 2012-10-16
Classification: G01F

Abstract:
1. A fluid flow meter comprising: a chamber having a fluid inlet and a fluid outlet; and a rotor having an end surface and a sidewall, said rotor being displaceable within the chamber, rotation of the rotor being related to the volume of fluid passing through the chamber, wherein the chamber has a surface proximate which the end surface of the rotor passes, the chamber surface and/or the rotor end surface having at least one recess to retain at least a portion of debris carried by the metered fluid wherein the at least one recess is formed so as not to provide fluid communication from the inlet to the outlet of the chamber across the rotor end surface via the recess, and wherein the at least one recess has a width in one direction which is less than a cross sectional width of a sidewall of the rotor.