Chemical Technology July 2016

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Chemical Technology • July 2016
COVER STORY
COVER STORY
small antennas. The new VEGAPULS 64, for example, has
the world’s smallest antenna and does not require a large
horn to focus its beam at the measured material. The
instrument’s small size makes a huge impact, particularly
as it applies to retrofitting. Plants can now integrate the
most advanced radar devices into their process without
shelling out thousands for modifications to their vessels.
Smaller instruments, however, are not just good for old
vessels; they can also help manufacturers stay nimble and
market-responsive.
There is a trend in the pharmaceutical and chemical
industries toward batch production. Batching allows opera-
tors to produce seasonal and low-volume products with less
financial investment. Small batches are produced in small
vessels, where conventional wisdom says using radar is
impossible due to small process connections. Thanks to the
compact design of 80 GHz radar sensors, that is no longer
true, and operators no longer have to sacrifice accurate
measurement in the name of space.
Resolution
Imagine looking at the picture on a standard definition
television next to that of an HD TV. The high definition
picture would be clearer, sharper, and more detailed due
to enhanced resolution. Users will see a similar difference
switching from low-frequency to high-frequency radar sen-
sors.
When the level of liquid in a vessel gets low enough,
26 GHz radar reads the echo from the material and the echo
from the tank bottom as one echo. This tells the user the
vessel is empty when it is not in fact empty and presents
a natural handicap to process efficiency. 80 GHz devices
measure liquid down to the last millimetre, giving users
accurate data they can use to optimise their processes.
Greater resolution is particularly important for shipbuilders,
who count on precise level in large ballast tanks.
Conclusion
High-frequency radar sensors are the “next big thing” in
level measurement. They are the proverbial “giant leap”, a
marker in time after which the process industry will never
be the same. Their excellent focusing makes them perfect
for vessels crowded with internals, their small size makes
them ideal for retrofitting and batch production, and their
unrivalled resolution allows users to get every last drop of
space from their tanks. The future of level measurement
is here.
A radar beam with 80 GHz only reflects from the product surface. A 26 GHz beam also reflects signals from agitators and internal fixtures.