Design and selection personnel often refer to standards such as JB/T 2379 "Metal Tubular Heating Elements" to evaluate industrial electric heaters. The following Q&A focuses on the maintenance and precautions of the JRH-45 industrial electric heater, for reference in selection and operation.
When wiring the JRH-45 industrial electric heater, confirm that the rated voltage matches the supply voltage. For three-phase elements, ensure the phase sequence is correct to avoid local overheating due to phase loss. Terminal connections should be tightened; excessive contact resistance can cause abnormal terminal temperature rise. The installation location should reserve maintenance space, and the heater should fully contact the heated medium to prevent dry burning. For scenarios heating oil, water, or chemical media, it is recommended to install a filter on the inlet side of the heater to reduce impurity deposition.
Regularly measuring insulation resistance is an effective means to judge the condition of the electric heater. When the cold insulation resistance is below 1 MΩ, check whether the junction box is damp and whether the heating element lead rods are damaged. For working conditions heating molten salts, alkalis, and low-melting-point alloys, clean the surface attachments of the heater promptly after shutdown to avoid excessive scaling affecting heat transfer. If the heater is used for hot-pressing molds, pay attention to the oxidation of the mating surface between the mold and the heater. Element materials can be selected from stainless steel, nickel-based alloys, copper, aluminum, carbon steel, titanium, etc. Different materials correspond to different media and should not be mixed during selection.
A decrease in heating speed is usually related to surface scaling or low voltage; leakage protection activation requires troubleshooting insulation failure or medium penetration into the junction box. When replacing elements, verify the model, power, voltage, and installation dimensions to avoid arbitrary substitution. If custom electric heating tubes of various models and shapes are required according to user drawings, it is recommended to specify the medium, working temperature, and protection level in the procurement agreement.
