che_november-2024 - 39

in a variety of processes (Figure 1).
Typical applications use the basic Utube
type design (upper left image in
Figure 1), with various form factors.
Very high accuracy requirements necessitate
the use of a larger U-tube
to maximize signal-to-noise ratio,
however, more compact designs
are now available. These designs
remain accurate, but have a smaller
piping take-out and much reduced
body size, made possible in part by
a V-shaped tube. Beyond those sensors,
there are many other options,
including: straight-through,
singletube
sensors that reduce plugging
and can be pigged; all-tantalum
body designs for corrosive liquids;
and specialty meters designed for
compressed or liquefied natural gas
(CNG and LNG), hygienic applications;
and designs for very high pressures
up to 15,000 psi.
Sensor cost will vary considerably
depending upon the body type, but
the broad range of available options
allows a user to find a suitable sensor
to meet their specific application
requirements and budget.
Transmitter improvements
There have also been significant
technological advances in Coriolis
transmitters, including new hardware
capabilities and software enhancements.
Historically, Coriolis transmitters
had somewhat limited options,
with only full-featured and expensive
models available. To address varying
needs, a range of Coriolis transmitters
are now offered that include
different electric classifications and
I/O offerings, with enhancements
that can be added as needed. This
scalability of features allows users to
choose a transmitter that meets their
requirements without paying for unneeded
or redundant features.
For instance, a typical high-tier
Coriolis transmitter might carry Class
1, Div. 1 electrical classifications and
have a large number of fixed I/O
channels. Less expensive transmitters
are now available for Class 1,
Div. 2 or unrated electrical areas,
and the I/O offerings have a smaller
number of configurable channels to
suit specific needs. There are also
different housings available - such
as standard painted aluminum or
316 stainless steel - to handle
various process environments, and
most of the transmitters can either
be integral to the sensor or
remote-mounted (Figure 2).
New transmitters offer expanded
hardware features that vary by
model, but typically include options
to energize the unit with a.c., d.c.,
two-wire power, or Power over Ethernet.
Bluetooth access is another
valuable feature offered with some
models, as well as other connectivity
options, including Modbus RTU,
Modbus TCP, HART RS-485 or EtherNet/IP.
Some units now offer conShapingthe
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FIGURE 2. Coriolis transmitters are now offered
with a wide range of housings, classifications and
hardware offerings
figurable I/O, which allow specific
channels to be set up for HART analog,
frequency, digital inputs, digital
outputs or various other digital communication
options.
Many of the latest Coriolis transmitters
can be configured without opening
the cover using WirelessHART,
secure Bluetooth connectivity or
capacitance touch sensors on the
graphical display. Most models also
offer a USB port for fast configuration
download or backup, and several
Coriolis transmitters on the marCHEMICAL
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NOVEMBER 2024
39
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