Thermal dispersion sensor performs multiple functions

FlexSwitch from FCI can function as a level sensor, flow switch, and temperature sensor, with capability to differentiate media in separation tanks.

09/08/2009


There are some sensing technologies that are capable of providing data on more than one type of process variable, although not always at the same time.

FLT 93S flow switch from FCI

Flow switches provide a lower-cost alternative to flowmeters where high resolution is not required.

The FlexSwitch FLT93S from FCI uses thermal dispersion technology in a way that can provide several types of information because different fluids have different characteristics for carrying off heat. If you deal with multiple fluids, separation tanks, or other mixed density situations, this can come in very handy.

The FLT93S switch is an insertion-style instrument that can perform monitoring, controlling, and alarming of flow rates or levels of critical fluids such as foams, emulsion layers, liquids, and slurries. It can be configured to function as a level switch with temperature, or as a flow switch with temperature. Dual 6A relay outputs are standard and are assignable to flow, level or temperature.

FCI says that unlike density displacers, which are often used for level and interface control, the FLT93S relies on the specific heat transfer properties of the media to identify the interface of different products. Using its thermal dispersion sensing capability, the device monitors the interface of products with similar densities for reliable control in separation tanks and other vessels. Under most conditions it can identify the interface between any type of media including foam, emulsion layers, liquids, and slurries. Its dual switch point option allows one instrument to control two different product interfaces. Two or more switches are used to control product discharge and intake at specified points.

The FLT Switch operates over a wide setpoint range in water from 0.01 to 0.5 fps (0.003 to 0.15 mps). Level/interface accuracy is

The FLT features built-in temperature compensation to ensure repeatable and reliable operation, even in extreme environments such as those found in high temperature chemical refining and other process industries. The company says this automatic compensation adjusts the instrument for changes in operating environment temperatures to ensure the trip points will remain accurate and prevent false alarms or alarm failures.

A wide selection of standard and custom process connections can be provided. The electronic control circuit can be integrally-mounted with the sensing element, or it can be located in a remote location. The standard enclosure is made from a coated aluminum alloy. It is suitable for use in ATEX locations and is rated for NEMA Type 4X (IP66) environments. Stainless steel or fiberglass enclosures also are available.

-Edited by Peter Welander, process industries editor, PWelander@cfemedia.com,
Control Engineering Process Instrumentation & Sensors Monthly
Register here to select your choice of free eNewsletters .





No comments
The Engineers' Choice Awards highlight some of the best new control, instrumentation and automation products as chosen by...
The System Integrator Giants program lists the top 100 system integrators among companies listed in CFE Media's Global System Integrator Database.
Each year, a panel of Control Engineering and Plant Engineering editors and industry expert judges select the System Integrator of the Year Award winners in three categories.
This eGuide illustrates solutions, applications and benefits of machine vision systems.
Learn how to increase device reliability in harsh environments and decrease unplanned system downtime.
This eGuide contains a series of articles and videos that considers theoretical and practical; immediate needs and a look into the future.
Controller programming; Safety networks; Enclosure design; Power quality; Safety integrity levels; Increasing process efficiency
Additive manufacturing benefits; HMI and sensor tips; System integrator advice; Innovations from the industry
Robotic safety, collaboration, standards; DCS migration tips; IT/OT convergence; 2017 Control Engineering Salary and Career Survey
Featured articles highlight technologies that enable the Industrial Internet of Things, IIoT-related products and strategies to get data more easily to the user.
This article collection contains several articles on how automation and controls are helping human-machine interface (HMI) hardware and software advance.
This digital report will explore several aspects of how IIoT will transform manufacturing in the coming years.

Find and connect with the most suitable service provider for your unique application. Start searching the Global System Integrator Database Now!

Infrastructure for natural gas expansion; Artificial lift methods; Disruptive technology and fugitive gas emissions
Mobility as the means to offshore innovation; Preventing another Deepwater Horizon; ROVs as subsea robots; SCADA and the radio spectrum
Future of oil and gas projects; Reservoir models; The importance of SCADA to oil and gas
Automation Engineer; Wood Group
System Integrator; Cross Integrated Systems Group
Jose S. Vasquez, Jr.
Fire & Life Safety Engineer; Technip USA Inc.
This course focuses on climate analysis, appropriateness of cooling system selection, and combining cooling systems.
This course will help identify and reveal electrical hazards and identify the solutions to implementing and maintaining a safe work environment.
This course explains how maintaining power and communication systems through emergency power-generation systems is critical.
click me