Level indicators wave the red flag

Rendering is a process that takes what normally would be animal waste and transforms it into usable product. The cycle begins by heating the animal product in a tank using steam from a boiler. Once the heat is used, the steam it's taken from is collected again and condensed in a separate tank where it starts the process over again .

12/01/1998


Rendering is a process that takes what normally would be animal waste and transforms it into usable product. The cycle begins by heating the animal product in a tank using steam from a boiler. Once the heat is used, the steam it's taken from is collected again and condensed in a separate tank where it starts the process over again . Level indication is necessary so technicians can monitor and maintain proper water levels in the condensate tank.

Mid South Steam Boiler Engineering Co. (Van Buren Ark.) manufactures these types of condensate tanks and fits them with level instrumentation. Ken Wormky, project manager for the company, says mechanical and pneumatic displacement-type level indicators were normally used with a sight glass showing the amount of water in the tank. These level indicators, though, were expensive and difficult to install. Over time they became cloudy and hard to read, would break, and sometimes injure technicians. This prompted an instrument change.

Mr. Wormky now equips the condensate tanks with the LevelSite magnetic flag-type level indicator from Barksdale (Los Angeles, Calif.), making the change based on several key factors. First, he says it's important for the user to see the water level in the condensate tank "at a glance." With flag-type level indicators, the brightly colored, rotating red flags are easy to read from the front or sides at distances of up to 100 ft., even when monitoring the level of a clear liquid. The indicator has no glass to cloud or break, and isolation from the measured media prevents the flags from discoloring.

Users also needed a system that was easy to install and maintain. Mr. Wormky says the LevelSite is not only easy to install, "it can be easily adjusted without bringing the system down." LevelSite is said to provide accident-proof level measurement to an accuracy of

Float is the key element

Equipped with a permanent ring magnet, the float rides at the surface of the liquid contained within the float housing, rising and falling with the liquid. As the float moves up and down in its housing, its position is tracked by the rotating magnetic flags. Flags below liquid level show their red side while those above show their white side. Because of the float's permanent ring magnet design, which provides a 3608 magnetic flux field, the rotating flags, limit switches, and continuous level sensors can be located anywhere around the float housing.

Connects to trransmiller

LevelSite can also transmit alarms and electrical signals to remote process control panels, PLCs, or distributed control systems. A common method would be to use an externally mounted, vertical-shaft transmitter equipped with a network of magnetically activated reed switches connected to a series of resistors. As the float rises or falls, it magnetically activates the reed switches, changing the electrical resistance in the network's circuit, which thereby provides a standard 4-20 mA or 0-10 V output signal. Because nothing ever contacts the measured liquid, the transmitters are easy to maintain, accurate, and reliable, Mr. Wormky says.

For more information on Barksdale, visit www.controleng.com/info


Author Information

Michael Drakulich, Assistant Editor mdrakulich@cahners.com




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.
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
Integrated mobility; Artificial intelligence; Predictive motion control; Sensors and control system inputs; Asset Management; Cybersecurity
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