In the production process of the electric heating tube, because the length and thickness of the resistance wire are slightly different, the power of the electric heating tube will have a slight deviation. This deviation is allowed.
The range of electric heating tube power deviation is given in "JB/T 2379-93 Industrial Electric Heating Tube Standard": Under the condition of full heating, the deviation of the rated power of the heating tube should not exceed the following specified range:
1. For electric heating tubes whose rated power is less than or equal to 100W: ±10%;
2. For electric heating tubes with a rated power greater than 100W: +5%~-10% or 10W, whichever is greater.
It should be noted that when measuring the resistance, there is a 10% coefficient difference between the cold resistance and the hot resistance.
According to the above standard, we can judge whether the power deviation of the electric heating tube meets the standard. In the next article, the editor will tell you how to judge whether the range of electric heating tube power deviation meets the regulations