If it is a long-term reserve electric heating tube that has not been used for a long time, the quality of the heating tube can be judged by the following points:

If it is a long-term reserve electric heating tube that has not been used for a long time, the quality of the heating tube can be judged by the following points:

Use a small resistance range to measure the wiring terminals at both ends of the electric heating tube. The resistance value should be below a few hundred ohms. A high-power electric heating tube will have a smaller resistance and energy flow, but if the resistance value is high, the electric heating tube may also have burned out.

Measure the resistance between the wiring pile head and the heating tube shell using the high resistance range of the electric meter. The resistance value should be infinite. If the resistance value is only a few tens of kiloohms, it indicates that the insulation of the heating tube has been broken, and there is a risk of leakage during use. It is best not to use such heating tubes again.

The quality of electric heating tubes has always been a concern for users, so many people are eager to know how to determine the quality of electric heating tubes. Here, I would like to say that there is no specific standard for judging the quality of electric heating tubes, which is determined by many factors. Today, let's take a look at how to judge the quality of electric heating tubes?

1, Material selection

The material selection varies depending on the heating environment:

1. Normal water heating uses stainless steel 304, weak acid and weak alkaline liquids use stainless steel 316L material, and strong acid and strong alkali use PTFE coating material.

2. Oil heating can be made of stainless steel 304 or iron material.

3. Air heating is quite unique, as it selects different materials based on the temperature.

(1) Use stainless steel 304 material for working temperatures below 300 degrees;

(2) The working temperature of the air dry burning electric heating tube is below 500 degrees, using stainless steel 321 material;

(3) The working temperature of the air dry burning electric heating tube is below 800 degrees, using stainless steel 310S material;

2, Power design

Because the power design of electric heating tubes varies in different usage environments, we usually measure them based on the power per meter (i.e. how much power can be achieved in a one meter long heating zone).

(1) The power per meter for water heating is between 1-3;

(2) The power per meter for oil heating is between 1-2;

(3) The power per meter for air heating is between 1-1.5; Beyond this range, the higher the power, the shorter the lifespan

If it is a long-term reserve electric heating tube that has not been used for a long time, the quality of the heating tube can be judged by the following points.

1. The pipe body is leaking electricity.

2. There is no obvious damage to the tube body. If the resistance value of the heating tube measured with a multimeter is 0, it must be broken.

3. There are obvious holes, sand holes, and cracking on the surface of the pipe.

If there are the above points, it can be judged that the heating tube is damaged.

four

Set the multimeter to the 1K ohm gear, connect the two probes to both ends of the heating wire, and move the pointer to a certain value in the middle to indicate that the heating wire is normal. If the pointer reaches the end, it indicates that the heating wire is short circuited. If the pointer does not move, it indicates that the heating wire is open circuited. Both short circuiting and open circuiting are problems and cannot be used normally.

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