Not every level measurement application is straightforward. In some instances, the nature of the substance being measured creates a hostile measurement atmosphere requiring creative solutions. Without reliable instruments in these environments, the level measurement readings can be inaccurate and cause significant problems.
gas production company required an accurate level measurement in a molten sulfur pit. Previously, the company used a bubble system, but it requires periodic maintenance and recalibration to keep it operational.
Obtaining an accurate level measurement is difficult in this application
due to both the low dielectric of the process medium and dry sulfur
buildup. In addition, the relatively high temperature (150°C)
and the corrosive properties of the molten sulfur increased the demands
for service and maintenance.
The Eclipse® 706 - guided wave radar transmitter - provides accurate and reliable level measurements in difficult process conditions. Comparing to other technologies, it requires less maintenance and does not need calibration. To ensure the maximum accuracy and reliability the transmitter was delivered with 7YF single-rod probe. Before the Eclipse was accepted as the molten sulfur pit level control device, it was tested and monitored for two weeks. Plant operators, using the manual hand-dipped method, inspected measurement made by the transmitter. After testing period, the performance of the Eclipse was verified and its application was endorsed. The single-rod probe performed well despite the problems that can be caused by sulfur buildup or coating. A strong pulse was still detected from the liquid surface despite the buildup. Reliable level measurement of molten sulfur in a pit is difficult to obtain. The Eclipse proved to be an excellent solution for process level control that was not adversely affected by high temperature, probe build-up, or the corrosive properties of the media measured.