Why is the electric heating tube more likely to break if it is left for a long time without using it?
When some customers order heating tubes in batches, some spare heating tubes will be left unused in the warehouse, and will be taken out when needed. But when it was used, it was found to be broken and could not be used. What is the reason?
Because the heating tube should not be placed for too long, there are mainly the following reasons:
1. Internal factors. Because the magnesium oxide powder in the electric heating tube can absorb moisture, and the heating tube port is not completely sealed, so if the air is placed for a long time in a humid environment, the moisture will enter the electric heating tube . At this time, the magnesia powder that plays a role of heat conduction is damp, so the electric heating tube will not heat up.
Situation analysis:
1. Measure whether there is any resistance value, if not, it is broken.
2. If there is a resistance value, check whether there is any leakage, and measure the insulation resistance value with a megger (insulation resistance meter). (The larger the insulation resistance value, the better the insulation). If the insulation resistance value is more If it is small, it means that the magnesium oxide powder in the electric heating tube may be damp, causing the insulation of the electric heating tube to weaken!
Solution:
1) Put the electric heating tube in the oven and bake it to dehumidify the magnesium oxide powder.
2) Use a low voltage to energize the electric heating tube for a while, which also plays a role in dehumidification.
