Level Measurement & Control


Foxboro buoyancy level transmitter

August 2019 Level Measurement & Control

Principle of operation

When an element a (displacer rod) is immersed into a liquid, according to Archimedes’ Principle, the displacer will ‘lose’ some of its weight proportional to the level of the liquid and its density. These changes in weight are converted to a measuring signal via a torque tube and can be used to determine liquid level, density and interface. When the displacer is fully immersed in the liquid, the density and interface level can be directed by suspending the displacer in a constant calendric shape into the liquid. This weight difference is detected by the use of a torque tube sensor that converts it to an electronic signal.

Foxboro’s intelligent 244LD LevelStar buoyancy transmitter is designed to perform continuous measurements for liquid level, interface or density in industrial process applications. The instrument is extremely robust and durable and easured values can be transferred using analog and digital methods. Digital communication facilitates complete operation and configuration via PC or control system. Despite extreme temperatures, high process pressure and corrosive liquids, the 244LD measures with consistent reliability and high precision. It is approved for installations in contact with explosive atmospheres and combines the abundant experience of Foxboro with most advanced digital technology.

Foxboro’s Model 244LD LevelStar is its most powerful version for high temperature and high pressure applications. Key features include:

• Process temperatures from –196 to 400°C.

• Process pressures from full vacuum up to 550 bar.

• Class 2500 and API 10000 version available.

• No moving parts = maintenance free.

• Easy two button and LCD display field calibration.

• FDT/DTM technology.

This turnkey solution consisting of a transmitter, displacer element and displacer chambers meets all EPC instrument specifications and is easy to setup and recalibrate in the field.

For more information contact Johan van Jaarsveldt, EOH Process Automation Solutions, +27 87 803 9783, johan.vanjaarsveldt@eoh-pas.co.za, johan.vanjaarsveldt@eoh-pas.co.za



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