IOM BiRotor Plus R27Page 15/58
8 Installation and Operation
General
The operation of the meter is embodied in the
function of the measuring rotors; they are always
dynamically balanced but hydraulically unbalanced
during operation. The rotors have no metal to
metal contact with each other or the housing in
which they rotate. Clearances between moving
components are maintained with the use of timing
gears.
The BiRotor Plus is a positive displacement (PD)
meter. A PD meter uses a mechanical principle that
measures flow by continuously dividing the flowing
stream into known volumetric segments, isolating
those segments momentarily, and then returning
them to the flowing stream while counting the
number of displacements. This is a direct volume
measurement, there is no inferred, or software
generated, measurement.
8.1 - Installation Requirements
1. The instrument should be mounted on a
secure foundation. Provisions should be made
for vertically mounting the meter to ensure
stability.
2. The process piping should not place any undue
strain on the instrument.
3. Precautions should be taken to ensure that
thermal fluid expansion does not raise the line
pressure above the maximum working pressure
of the instrument.
4. Process piping must be clean and free of any
foreign matter.
5. A strainer should be installed upstream of the
instrument.
6. An air eliminator should be installed upstream
of the instrument if the process fluid is
expected to contain entrained air.
7. A flow limiting valve should be installed
downstream of the instrument, this will
maintain a back pressure on the instrument
and prevent excessive flow rates.
8. Isolation valves should be located at either
ends of the instrument run and a bypass
section installed. This will facilitate ease of
component removal, when required, and
reduce loss of product.
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