Chemical Engineering July 2019 - 23

process operating safely, " explains
Tony Maupin, market segment manager
with WIKA USA (Lawrenceville,
Ga.; www.wika.com).
Accuracy, reliability, repeatability
When seeking temperature measurement
instrumentation, processors
usually demand accuracy, reliability
and repeatability in order to
achieve efficient processes that produce
high-quality product in a safe
and energy-efficient manner.
Accuracy is important when the
processor is looking at very critical
measurements that affect product
quality. " The margin could be very slim
between having a successful reaction
and burning or degrading a product, "
says Meyer. " In those cases, accuracy
is a very important feature. "
Repeatability, or stability, of instrumentation
allows processors to know
that the same process conditions
are being repeated. " Many customers
will say accuracy is most important,
but that's not always true, " says
Ehren Kiker, product marketing manager
with Endress+Hauser (Greenwood,
Ind.; www.us.endress.com).
" Accuracy implies that the instrument
measures with plus or minus a
certain percentage of accuracy, but
that means today the measurement
could be plus 1% and then tomorrow
it could be minus 1%. But, with
a repeatable or stable measurement,
I know it will always be off by plus
1% and can correct for that. When
it's all over the map, even if only by
plus or minus 1%, it's not as easy to
account for. "
And, reliability is also important. " If
you have a failed measurement in a
batch process, you could waste the
batch, cause rework and negatively
impact profits, " says Yokogawa's
Meyer. " Likewise, if the measurement
points go out during a continuous
process, you could end up with
unplanned downtime, which also
equals lost profit. "
Instrumentation advancements
Often, the user friendliness of not
just instrumentation, but of programming
techniques and calibration, can
impact accuracy, repeatability and
reliability of the measurement. For
this reason, equipment providers
are making it easier to use. To simplify
programming and monitoring
of temperature transmitters, some
manufacturers are adding Bluetooth
capability to their instruments.
INOR, for instance, has the INOR
Connect application (Figure 1), which
allows operators to connect to the
transmitter with a smartphone or tablet
using Bluetooth or near-field communication
so they can configure
and monitor temperature transmitters
without supply voltage and cables.
The application offers the same configuration
options as INOR's existing
ConSoft transmitter software, but with
a more user-friendly interface. " The
app gives users the ability to communicate
and configure transmitters
with their phones, which makes it
easier to get the product installed in
their process because they can now
program the transmitter right in the
field. This is a huge help when something
goes down at an inopportune
time and needs to be replaced and
programmed as quickly and easily as
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Chemical Engineering July 2019

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