However, when the bushing contains an uncooled joint that incorporates a transite T-bar for the electrical isolation, the thermal gradient in the bushing joint area is adversely altered.
In this method, the bushing is fitted with Type K thermocouples.
If the temperature of the copper bushing is 140F (60C), and if the temperature 1 in.
By installing thermocouples in the refractory, the temperature gradient between the bushing and the saturation network can be monitored.
Using a simple clock diagram, the thermocouples are taped to the outside of the bushing at the 3, 6, 9 and 12 o'clock positions.