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Click to enlarge image
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It is the key factor to the optimum service life of the element that correctly select from the surface load of the element according to the furnace construction, atmosphere and temperature. Left figure shows the relation between furnace temperatures, element temperature and element surface load under the condition that the element radiation isn't obstructed.
Recommend surface load:
Furnace Temp 1100?: Surface load <17 W/cm2;**
Furnace Temp 1200?: Surface load <13 W/cm2;**
Furnace Temp 1300?: Surface load <9 W/cm2;**
Furnace Temp 1350?: Surface load <7 W/cm2;**
Furnace Temp 1400?: Surface load <5 W/cm2;**
Furnace Temp 1450?: Surface load <4 W/cm2.***
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