Badger Meter Disc Meter - Manual (Page 5)

Installation & Operation Manual
DESCRIPTION
The Badger Meter Recordall (RCDL) positive displacement meters are one of the most cost effective methods in metering
industrial fluids . The RCDL meter has a simple, efficient design for high accuracy and repeatability over the entire meter
flow range .
Available in five sizes, 1/2" through 2" for flows up to 170 gpm, these meters are extremely rugged and reliable . Maintenance
is seldom required, but if necessary, takes only a few minutes . All parts are designed and built of materials that meet your
application requirements and provide an enduring and a trouble-free, precision flow meter .
To complement the RCDL meter line, Badger Meter offers a complete line of accessories that includes totalizers,
electromechanical and electronic endpoints, rate of flow indicators and batch/process controllers .
Operating Principle
The metering principle, known as positive displacement, is based on the continuous filling and discharging of the measuring
chamber . Controlled clearances between the disc and the chamber provide precise measurement of each volume cycle .
As the disc nutates, the center spindle rotates a magnet . The movement of the magnet is sensed through the meter wall
by a follower magnet or by various sensors . Each revolution of the magnet is equivalent to a fixed volume of fluid, which is
converted to any engineering unit of measure for totalization, indication or process control .
Liquid flowing through the meter chamber (A) causes a disc (B) to nutate or wobble . This motion, in turn, results in the
rotation of a spindle (C) and drive magnet (D) . Rotation is transmitted through the wall of the meter to a second magnet (E) or
varied style of sensor pickup .
C
B
A
E
D
Figure 1: Nutating disc operation
Page 5 February 2013