Abstract
How to avoid damage to electric heating tubes during use? This article compiles complete safety operation points from installation to storage.
Humidity Limit
The recommended maximum relative air humidity is 95%. Excessively high humidity can cause flashover at the terminal connections.
Voltage Monitoring
The actual operating voltage should not exceed 1.1 times the rated value. Excessive voltage will cause a sudden increase in surface load, shortening the life of the alloy wire.
Effective Heating Zone
Ensure that the heating section of the electric heating tube is completely immersed in the medium (such as liquid or metal mold). Dry burning is strictly prohibited because air has extremely low thermal conductivity, causing the tube to overheat instantly and melt.
Scale and Carbon Removal
When heating hard water or thermal oil, scale or carbon deposits easily form on the tube surface. These substances act as a natural thermal barrier, hindering heat dissipation. Once detected, they must be physically removed promptly.
If an electric heating tube has been stored for a long period and its insulation resistance drops below 1 MΩ, do not energize it directly.
Drying Strategy
Place the tube in an oven at 200°C for several hours, or apply a low voltage to gradually heat the tube and expel internal moisture.