The EMLI III Ladle slag detection system uses state-of-the-art electronics and custom designed sensors to detect the presence of slag in the well block area of the ladle. 

This design allows the EMLI system to generate a reliable and accurate slag alarm far in advance of the slag detection of a human operator.

This allows the user to maximize yield while greatly minimizing slag carryover.

The EMLI Ladle slag detection system utilizes two sensor coils, placed on opposite sides of the well block in the bottom of the ladle.  One coil is used as a transmitter and the other is used as a receiver.

The transmitter is excited with a controlled AC current.  This current causes the formation of an electromagnetic field that is detected by the receiver.

When the well block is empty, maximum signal transfer occurs and the receiver detects a strong signal.

As tapping begins and the well block is totally filled with steel, maximum signal shielding occurs and the receiver detects the minimum signal.

Near the end of the tapping, slag begins to become entrained in the stream and appears in the well block.  Since slag does not shield electromagnetic signals, the signal in the receiver begins to increase toward maximum.  The received signal is directly proportional to the amount of slag in the well block.

When the received signal reaches a certain predetermined set-point level, a slag alarm is activated.