Tangential Meter for Liquids

A mechanical meter for measuring the quantity of liquid flowing through a pipe (2), comprising an impeller (1) supported by a saddle (3) positionable on the outer surface of the pipe (2), the inner surface of the saddle (3) being arranged to abut, at least by a part thereof, directly against the outer surface of the pipe (2) such as to ensure the same penetration of the impeller (1) into the pipe (2) for each installation, said impeller (1) being of tangential type, when the meter is mounted on the pipe (2), said impeller (1) partly projecting into the pipe (2), characterised by comprising one or more deflectors (7, 9) arranged to penetrate into the pipe (2) through the hole provided in this latter and disposed in front of the impeller (1), at least one of said deflectors (7, 9) being disposed about the impeller (1) to form a collar from which the impeller (1) partly emerges.