Chemical Engineering July 2023 - 20

Sensirion
A small flow sensor for
flowrates up to 1 L/min
The SLF3S-4000B liquid flow sensor
(photo) accurately measures flowrates
up to 1 L/min with the usual
quality, while measuring just 5 cm
in length and weighing 7 g. Normally,
either higher flow velocities
or larger channel cross-sections are
required to accurately measure high
flowrates; both factors, however, increase
the likelihood of turbulence.
To overcome this hydrodynamic
limitation,
this company employs
Fluid Components International (FCI)
a design trick - the new channel
profile has a W shape. This allows
the micro-electromechanical system
(MEMS) chip to be positioned
along the narrower side stream (with
laminar flow), where it can really
demonstrate its measurement performance.
The new sensor covers
flowrates from microliters per minute
to 1 L/min. Initial field trials are also
being planned for a device handling
flowrates up to 20 L/min. - Sensirion
AG, Stäfa, Switzerland
www.sensirion.com
Precise gas line control for
ovens and furnaces
Emerson
Flexim
20
The compact ST75 air/gas flowmeter
(photo), which measures fuel
gas, process gas, inert gas, waste
gases and air in small line sizes, is
suitable for optimizing natural-gas
flow control for industrial ovens,
heat chambers and furnaces to reduce
process and plant fuel costs.
No matter the type of oven, heat
chamber or furnace, they all benefit
from the precise control of natural
gas flow. The ST75 helps process
and plant engineers more accurately
control their complex heating
processes to optimize rise time,
which lowers gas consumption and
minimizes plant energy costs. In
addition, reducing natural gas consumption
shrinks a plant's carbon
footprint to protect the environment.
The ST75 is equally well suited for
low- and high-flow operations in industrial
ovens and operates over a
wide flow range, from 0.01 to 559
std. ft3/min depending on line size.
For variable process conditions, the
ST75 is factory preset to a wide
turndown range at 10:1 to 100:1.
The ST75 flowmeter features accuracy
to ±2% of reading with ±0.5%
repeatability over varying
process
CHEMICAL ENGINEERING WWW.CHEMENGONLINE.COM
The Rosemount 319 Flushing Ring
with valve-integrated design (photo),
ensures accurate differential pressure
(DP) measurement and lower maintenance.
Available in traditional and compact
options, the new 319 Flushing
Rings provide a process-to-seal connection
and allow for faster diaphragmseal
maintenance without disconnecting
them from process flanges. The
traditional design utilizes a flow-through
cleaning action and can be sized to
fit almost any application. Configurations
are offered with a choice of ball
valves, needle valves or gate valves,
and in multiple materials, flange types,
sizes and ratings. The compact design
removes residual build-up quickly,
cleaning five times faster over 30%
more surface area and 50% fewer leak
points than other flushing rings. - Emerson,
Shakopee, Minn.
www.emerson.com
Real-time determination of
gas-quality parameters
With the Natural Gas Engine (NGE)
function of the Fluxus G gas flowmeter
series (photo), this company now
offers the possibility of determining
gas parameters, such as compressibility,
molecular weight and density
simultaneously with the flow in real
time, enabling the meter to output the
correct standard volume flow. The
analysis function of the NGE is based
on the measurement of the speed of
sound - the same clamp-on transducers
mounted on the outside of
the pipe that are used to determine
the volume flow by measuring the
transit time difference simultaneously
record the speed of sound of the medium
flowing inside. The company
has developed a self-learning algorithm
that links the speed of sound
with gas quality parameters. A series
of tests in independent test laboratories
confirmed the performance and
accuracy of the NGE, for example,
when measuring the flow of natural
gas-hydrogen mixtures. - Flexim
GmbH, Berlin, Germany
www.flexim.com
n
Gerald Ondrey
JULY 2023
temperatures in line sizes from 0.25
to 2 in. - Fluid Components International
(FCI), San Marcos, Calif.
www.fluidcomponents.com
Reduce maintenance of
DP measurements
http://www.fluidcomponents.com http://www.sensirion.com http://www.emerson.com http://www.flexim.com http://WWW.CHEMENGONLINE.COM
Chemical Engineering July 2023

Table of Contents for the Digital Edition of Chemical Engineering July 2023
