INTRODUCTION
A semi positive displacement rotary piston flow transducer type
KPO is situated in the liquid line, which detects the transfer of
very small volumes of liquid. A magnetically operated switch
converts the piston movement irato impulses which are transferred
along Mn screened wire to remote electronic counting/control
devices.
INSTALLATION
Location of Meter.
It is recommended that the meter be fitted irato a vertical section
of the pipe run wherever possible. With the meter fitted irato
horizontal pipe, it is possible that errors in registration can be
caused by the settling of the piston due to gravity within the
measuring chamber after shut off. The moviment of the piston after
metering has ceased can trigger the reed switch and create an extra
pulse. The meter should be fitted up stream of any flow control
device, thus preventing free discharge front the meter and
minimizing the risk of draining and vopour locking causing
erroneous reading on start up.
Preparation of Pipework.
Before fitting the meter irato 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 mode with !he
meter in position.
That the distance between unions or flanges is correct far 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 al/ rust, swarf, welding slag
jointing compound by flushing or similar means before
putting the meter irato service.
Installation of Meter.
To prevent damage to the REED switch encapsulations, they
should be removed belare fitting the meter fin to the fine.
As the meter are bi-directional (i.e. flow may take place in either
direction) direction arrows are not required and the meter may
be fitted directly in to the system.
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