The EMLI ELP Electromagnetic Furnace Profile System is a measurement unit for recording a complete furnace material profile at a fixed location when required.  The system can be used in all furnace/smelter types where access is possible and the process requires knowledge of different materials levels. Slag thickness, matte level and bottom build-up can all be provided quickly and easily.

Level Sensing

The system is easy to use with pre-prepared lances performing a software controlled sequence of immersion and withdrawal.  During the immersion sequence an electromagnetic sensor sensors conductivity changes as it passes through the different material layers.  This information, in combination with the lance position and time, is fed to the plant PLC or Level 2 system.

Lance mechanisms, speed and immersion times are all customized to fit the specific requirements at a measurement location.  The system is capable of measuring a change of electromagnetic coupling in the order of 2% and will produce a complete furnace profile.

The output of the system will be lance position, show as height about the furnace bottom, and material conductivity.  These signals can be delivered as two 4-20ma signals or in Profibus format.

Bottom Build-up

High resolution lance position encoders, mechanical structure, and sensitivity to solid surfaces, allow the system to provide accurate information about hearth position, including bottom build-up at location of measurement.  Information is received and transferred to the plant PLC or Level 2 system.

Temperature Measurement and Sampling

In the optional twin lance format the ELP system can also provide matte temperature measurement and pure samples.  the second lance functions independently of the profile measurement and can be programmed to follow immediately after or any other occasion.  Correct temperatures or samples from the required level, (in the matte), are assured by knowledge of the exact measurement depth.

Typical System Measurement Chart

The chart above is a plot of the measured conductivity vs. the sensor position in the furnace.  The transition areas are readily apparent.