Optical coil protection of two induction furnaces at Affilips N.V., Tienen, Belgium

LIOS DTS technology is being used for the OCP system to protect the integrity of the refractory lining of two 2.5-tonne vacuum-type coreless induction furnaces used for melting copper pre-alloys. These particular furnaces are operated in three-shifts to produce copper-iron pre-alloys. Such alloys pose exacting demands on the crucible material due to their aggressive chemical characteristics and fluidity. The tapping temperature is in the region of 1500 °C.


  • 1 OTS20P Controller, 2 channel fiber switch
  • Simultaneous monitoring of two 2.5 t furnaces (1200 kW, 200 Hz)
  • Connected to the JOKS-visualisation system via a serial interface.
  • High precision measurement with 27 cm spatial resolution and less than 1 K temperature accuracy.
  • 2 x 60 m OCP sensor cable installed meander wise in two levels (top and bottom)
  • 2 x 20 m supply cable


April 2004


Over a span of a few charges, oven temperatures increasing from one charge to the next were identified in a specific position, and the system eventually generated alarms of the “deviation from average” type. The crucible was broken out, and a crack was found at this point which had allowed the melt to infiltrate the ramming compound.

Once a critical maximum temperature had been identified over several crucible campaigns, the OCP system was used as an indicator to identify the need for a scheduled re-lining.


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