The EMLI Tundish Level Measurement System
The EMLI Tundish Level Measurement system provides consistent and accurate level monitoring during continuous casting. Its robust design and precise control support enhanced production stability, ensuring optimal steel flow with this innovative measurement solution.
EMLI System Overview
The EMLI™ (Electro Magnetic Level Indication) system employs advanced technology to measure and detect liquid metal levels accurately. The system’s core components include a MANAGEMENT UNIT, a CONTROL UNIT, and a PREAMPLIFIER UNIT. A single MANAGEMENT UNIT can oversee up to eight CONTROL UNITS in setups with multiple systems.
The MANAGEMENT UNIT is responsible for system monitoring, data logging, and setup, with remote access capabilities through an Internet connection if enabled.
The CONTROL UNIT is the system’s central component, generating the transmitter signal and processing the measurement data.
The PREAMPLIFIER UNIT amplifies the measurement signal before sending it to the CONTROL UNIT.
EMLI – Tundish Level Measurement System
The EMLI Tundish level measurement system is a durable instrument that consistently and accurately monitors the liquid metal level in a continuous caster tundish. It provides real-time level output for either monitoring or automatic level control.
This system features two sensors mounted between the tundish’s metal shell and refractory lining. These sensors are designed for longevity, lasting from one tundish relining to the next.
A key advantage of the EMLI Tundish Level Measurement System is its precise measurement capability, covering the entire metal level from the bottom refractory to the overflow spout. This enables users to maximize metal yield while ensuring no slag enters the continuous caster mold.
As previously explained, the EMLI tundish level measurement system uses two sensors: a transmitter and a receiver. These sensors are typically positioned opposite each other within the tundish vessel. The transmitter sensor is energized with an AC current, generating an electromagnetic field. This field is directly coupled to the receiver sensor. When the metal level in the tundish is low, the electromagnetic field travels unobstructed to the receiver, resulting in a strong detected signal. Conversely, when the metal level is high, part of the electromagnetic field is blocked from reaching the receiver, causing a decrease in the received signal. This method of level measurement produces an output signal that corresponds directly to the metal level in the tundish.
It is crucial to emphasize that slag on the metal surface does not affect the EMLI measurement system. The system accurately measures the metal level, regardless of the slag content in the tundish.
Additionally, the eddy currents generated are reduced as the metal level increases. This leads to a smaller magnetic field and a weaker signal received by the sensor.
Exceptional System Advantages
The EMLI Tundish Level Measurement System’s capability to measure the actual metal level in the tundish, rather than just weight, provides modern steelmakers with several advantages:
- It enables precise draining of the tundish at the end of a continuous casting sequence, significantly increasing yield while minimizing the residual skull left in the tundish. Some customers have reported that the yield improvement covered the cost of the system in less than eight months.
- When integrated with the automation tundish level regulation system, the EMLI system maintains a stable metal level, resulting in constant Ferrostatic head pressure over the tundish taphole. This stability enhances the efficiency of the mold level control system, leading to improved mold level regulation.
- The EMLI system’s accurate and precise level measurements allow for minimizing the steel intermix zone during ladle changes, resulting in substantial savings by reducing downgrades and additional processing.
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