What is an Electric Arc Furnace Cover?


While filling an Electric Arc Furnace (EAF), the electrodes are raised and are made to rotate into a parked position. Following this, the EAF cover is raised and rotated into a parked position for EAF loading. When the vertical and rotational movement reaches a programmed parked position, the Mill Duty lever arm limit switches or proximity switches provide discrete outputs.

Electric Arc

Often, however, these switches fail every three to four months. Thus, the adjustment of the actuation points can only be performed when the furnace is not in operation, in effect, leading to large blocks of downtime.


To combat the above issue, a 950MD Mill Duty Housing with a 952 BlueOx LDT was mounted alongside the hydraulic cylinders during their rotation and movement of the cover vertically. The signal is fed to a 1995L Programmable Limit Switch that is mounted in a safe and accessible location, as the 950MD follows the cylinder stroke.


  • Programming that is accessible and safe, owing to remote PLS
  • Prevention of loss of position data, even in cases of power loss, since 950MD is absolute
  • Non-contact 950MD
  • Reduced downtime and enhanced average life expectancy of 950MDs, more than triple than that of a limit switch


Thus, the Gemco 950MD Mill Duty Housing and 952 BlueOx LDT are best equipped to provide absolute position feedback, even in the harshest of environments.

This information has been sourced, reviewed and adapted from materials provided by Ametek Factory Automation.

For more information on this source, please visit Ametek Factory Automation.


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