Chemical Engineering May 2016 - 88

Gulf Coast 2016 Special Advertising Section
Measure level with higher
reliability and fewer alarms
Endress+Hauser compensates for polar
molecules in guided wave radar applications
A
re you experiencing deviation
alarms in high-pressure process
vessels? In many high-pressure vessels,
redundant level measurement
technologies are employed to provide
multiple level indications for
safety, points out Endress+Hauser.
It is common for these instruments
to use different technologies, so as to
provide what is referred to as " diverse redundancy " .
A process condition that may give
problems for one technology will likely not
affect the others, ensuring that a reliable
level measurement is being provided by at
least one technology.
Guided wave radar (GWR), also called
time-domain reflectometry, is a time-offlight
level measurement technology
for level measurement in high-pressure
vessels. How an instrument
will function in the application in
which it is being applied is particularly
true of GWR transmitters
in high-pressure vessels. Typically, a
GWR will send a pulse through the upper
gas phase in the vessel to reflect off of the liquid
(or solid) material being measured. In high-pressure
applications where the upper phase is made
up of a gas with a polar molecular structure, special
consideration needs to be taken to obtain repeatable
measurements.
Since polar molecules alter the speed of
microwave pulses, the microwave are slowed,
resulting in measurement errors. GWR will therefore
give the wrong level unless the reduction in
speed of the microwave pulse, which slows as it
propagates through the upper polar gas phase,
is compensated. The result is an indicated level
reading that is less than the actual process level.
Clearly, when using a GWR for measurement
in high-pressure applications with polar molecules
in the gas phase, corrections to the resulting
error must be made based on pressure and

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Chemical Engineering May 2016

Table of Contents for the Digital Edition of Chemical Engineering May 2016

Contents
Chemical Engineering May 2016 - Cover1
Chemical Engineering May 2016 - Cover2
Chemical Engineering May 2016 - Contents
Chemical Engineering May 2016 - 2
Chemical Engineering May 2016 - 3
Chemical Engineering May 2016 - 4
Chemical Engineering May 2016 - 5
Chemical Engineering May 2016 - 6
Chemical Engineering May 2016 - 7
Chemical Engineering May 2016 - 8
Chemical Engineering May 2016 - 9
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Chemical Engineering May 2016 - 11
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Chemical Engineering May 2016 - 15
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Chemical Engineering May 2016 - 42
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Chemical Engineering May 2016 - 45
Chemical Engineering May 2016 - 46
Chemical Engineering May 2016 - 47
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Chemical Engineering May 2016 - 49
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Chemical Engineering May 2016 - 88
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Chemical Engineering May 2016 - 96
Chemical Engineering May 2016 - 97
Chemical Engineering May 2016 - Cover3
Chemical Engineering May 2016 - Cover4
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