IOM BiRotor Plus R27Page 21/58
9 Maintenance
General
The Brodie BiRotor Plus will give many years
of consistent performance with little need for
maintenance or service. There are, however,
several recommendations which, if followed, will
further extend the instrument’s service life.
The instrument should be kept filled with the
process fluid it is measuring. This prevents the
exposure to any product vapor which, in the case
of petroleum products, are more corrosive than
their liquids. In addition, this also prevents the
formation and build up of deposits or gums, which
would cause increased mechanical friction. The
instrument should always be kept free of water,
keeping it full of process fluid will accomplish
this, but if this is not possible a regular inspection
program should be set up and any water drained
from the measuring unit.
Filter and strainer baskets should be cleaned
frequently. Debris and foreign matter are the
biggest cause of meter wear and damage.
All other associated equipment within the system
should be regularly maintained and checked for
functionality.
NOTE:
If the instrument is being used in hazardous
areas, all instructions on the labels and in this
manual must be followed before the start of any
maintenance.
If the instrument is removed from the process line,
the line should be sealed with suitable blanking
flanges to prevent any possible leakage of product.
WARNING:
The internal measuring element contains closely
meshed moving parts, care should be taken not
to insert fingers into the rotors or timing gears
as this will cause injury.
NOTE:
All Item Numbers referenced in this section can
be found on Figure 11-1 in Chapter 12, Parts Lists.
Performance Considerations
The amount of maintenance necessary for efficient
instrument performance is dependent on many
factors; some of these are listed below.
Continuity of Operation: An instrument that
operates continuously will require more attention
than one used intermittently.
Working Flow Rate: The life of the instrument is
proportional to the speed of its operation. If the
instrument is operating at or near the maximum
flow rate it will have a shorter life expectancy than
if it were operating at its minimum flow rate.
Lubricity: The lower the lubrication properties of
the process fluid being measured then the lower
the life expectancy should be.
Cleanliness: A product contaminated with abrasive
particulate will accelerate the wear of the
instrument.
Electronics
This instrument can be provided with up to
two inductive pick off sensors and an optional
preamplifier. Maintenance of the electronics does
not require the system line pressure to be drained
or the instrument to be removed from the system.
ESD precautions must be followed.
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