INTRODUCTION
A semi positive displacement nutantic disc flow transducer type
KDN is situated in the liquid line, which detects the transfer of
very small volumes of liquid. A magnetically operated switch
converts the disc movement into pulses which are transferred
along twin screened wire to remote electronic counting/control
devices.
INSTALLATION
Location of Meter.
It is recommended that the meter be fitted into a horizontal
section of the pipe run wherever possible. With the meter fitted
into vertical pipe, errors in registration can be possibly caused
by the settling of the disc due to gravity within the measuring
chamber after shut of the movement of the disc after metering
has ceased can trigger the reed switch and create an extra pulse.
The meter should be fitted upstream of any flow control device,
thus preventing free discharge from the meter and reducing the
risk of draining and vopour locking causing erroneous reading
on start up.
Preparation of Pipework
Before Petting the meter into position, the following points
should be checked:
That unions or flanges of correct size and spacification have
been fitted to the pipeline in the required position. Joints
requiring the application of heat must never be made with
the meter in position.
That the distance between unions or flanges is correct for the
meter to be fitted.
That the two unions or flanges are in line, and all local
pipework is unstrained and correctly supported. This is
particulary significant when using meters constructed in
PVC.
The pipeline must be purged of a!! rust, swarf welding slag
jointing compound by flushing or similar means before
putting the meter into service.
