Chemical Engineering June 2020 - 15

pressure or temperature calculations
to read flowrate. " what ends up happening
is that you have three or more
different instruments taking these separate
measurements, and each one
has its own accuracy, so that compounds
the measurement uncertainty
you're dealing with, " explains edens.
in compressed-air systems, many
interconnected sub-meters may be
involved, so minimizing uncertainty
is key. " You have to figure out where
the leaks are happening, so installing
a flowmeter to measure primary
airflow from the compressor, along
with sub-meters at each end-use
facility, can give data to compare to
the estimated demand. if there is variance,
you can start to identify leaks, "
she adds.
wastewater treatment is an essential
part of environmental management,
and flow measurement is a
central activity in ensuring that these
processes are operating as intended.
although most users might envision a
flowmeter being installed on a closed
pipeline or tube, the open channels
encountered in the water-treatment
sector
also
require
accurate and
precise flow measurements, particularly
at the water inlet (figure 2). for
these special tasks, devices typically
used for level measurement can be
adapted. " You can find open channels
in all kinds of wastewater treatment
systems. the flow is measured
in open channels using an ultrasonic
sensor for height measurement and
related linearization, " explains Jürgen
skowaisa, product manager radar,
vega grieshaber Kg (schiltach,
germany; www.vega.com). for this
type of application, radar technology
provides reliability because it is
VEGA
GEMÜ Valves features
diaphragm valves,
butterfly valves,
angle seat and
globe valves,
lined metal valves,
flow measurement,
and multiport
block valves.
unaffected by temperature changes,
says skowaisa. vega's radar devices
are now offered with a new 80gHz
radar chip that is optimized for
measurement tasks in the water and
wastewater industries.
Less process disruption
flowmeters are also adapting to processing
demands by offering simpler
installation and maintenance for their
devices. " customers are tending to
shy away from devices with many
moving parts that could cause downtime, "
says dave vollaire, instrumentation
product manager at gf piping
systems (gf; irvine, calif.; www.
gfps.com). gf has launched the
signet 2580 flowtramag magnetic
flowmeter (figure 3), which features
a full-bore, all-plastic design with no
moving parts that is lighter weight
Your Valve and
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3800 Camp Creek Parkway * Building 2600 * Suite 120
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FIGURE 2. A level-measurement device can be
adapted to provide open-channel flow-measurement
readings in water-treatment applications
For details visit adlinks.chemengonline.com/76991-15
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Chemical Engineering June 2020

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