external float by applying an interrogation pulse to a
waveguide medium. This current pulse causes a magnetic
field to instantly surround the waveguide. The permanent
magnet that is situated inside the float also generates a
magnetic field. At the point where the magnetic field from
the waveguide and the magnetic field from the float
intersect, a rotational force is created. This, in turn, creates
a torsional-sonic pulse, which travels along the length of
the waveguide. The head of the transmitter houses the
sensing circuit. This detects the torsional-sonic pulse and
translates it into an electrical pulse. The distance from a
reference point to the float
is determined by measuring
the time interval between
the initiating current pulse
and the return pulse and
knowing the precise speed
of these pulses. The time
interval is then converted
into a level measurement.
The MG liquid level
transmitter incorporates a
Modbus RTU interface over
RS485, which is easy to
integrate with most control
systems. This transmitter
offers level measurement
accuracy of +1 mm, plus
+0.1˚C temperature
accuracy. It can be supplied
with different hazardous
area approval rating,
including approvals under
ATEX, FM, CSA, KC,
INMETRO, CCoE and IECEx,
if required. In addition, it
features three in one
measurement, with the
product level, interface and
temperature measurement
all being attainable from a
single process opening. This
means that multiple items of
instrumentation are no
longer needed. The upshot
of this is that the associated
costs, as well as the time
and effort involved in
integrating the sensor
system are markedly
reduced.
Conclusion
The MG’s highly advanced
volume calculation
functionality enables the
quantity of liquid present to
be rapidly determined
without requiring
employment of complex
mathematical algorithms. In this particular application,
once the MG transmitters had been installed, it was
possible to ascertain the precise content level of tanks
with 15 000 l capacities to within a 2 l margin. Following
the deployment of the asset management system
(supported by its MG liquid level transmitters) across its
network of sites, Refuels personnel were much better able
to assess the company’s fuel resources. Efficiency levels
were significantly improved and operational expenditure
substantially lowered. Finally, asset losses were also
reduced and customers were billed more accurately.
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