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.
The Engineering Leaders Under 40 program identifies and gives recognition to young engineers who...
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.
Sensor-to-cloud interoperability; PID and digital control efficiency; Alarm management system design; Automotive industry advances
Make Big Data and Industrial Internet of Things work for you, 2017 Engineers' Choice Finalists, Avoid control design pitfalls, Managing IIoT processes
Engineering Leaders Under 40; System integration improving packaging operation; Process sensing; PID velocity; Cybersecurity and functional safety
This article collection contains several articles on the Industrial Internet of Things (IIoT) and how it is transforming manufacturing.

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

SCADA at the junction, Managing risk through maintenance, Moving at the speed of data
Flexible offshore fire protection; Big Data's impact on operations; Bridging the skills gap; Identifying security risks
The digital oilfield: Utilizing Big Data can yield big savings; Virtualization a real solution; Tracking SIS performance
click me