First, we use the resistance meter to see if there is any resistance value of the electric heating tube. If there is no, the electric heating tube is broken.
It may be that the resistance wire inside the electric heating tube is broken, so that it cannot be repaired. If a U-shaped tube is broken like a flange electric heating tube, if the other U-shaped heating tube has a resistance value, then the flange electric heating tube can not be repaired. Because all the U-tubes are welded up, they cannot be removed.
Second, if the electric heating tube has a resistance value
1. There are small holes on the surface of the heating tank, and the leakage of electricity always occurs.
In this way, the surface of the electric heating tube is corroded, and the liquid is immersed in the magnesium oxide powder through the small hole, so that the magnesium oxide powder loses thermal conductivity and insulation. This can't be repaired.
2, the heating tube surface is smooth, no dents or holes
It shows that the electric heating tube can also be repaired. It may be that the electric heating tube is placed in a humid environment for a long time, and the internal magnesium oxide powder is damp, weakened or loses thermal conductivity and insulation, and the surface temperature of the electric heating tube is not high. The repair method is to place the damp electric heating tube in an oven at a temperature of 200 degrees and bake for 30 minutes.