Tubular electric heaters often experience coking on the heating element surface, local overheating, or early burnout in scenarios such as thermal oil furnaces, thin oil station oil tanks, and asphalt tanks. The problem usually lies not in the heater itself, but in the matching of medium characteristics, surface load, and installation method. The JRH-11 tubular electric heater is designed for this aspect, helping technical engineers avoid common pitfalls during the selection stage.
Immersion bare wire heating structures respond quickly, but the resistance wire directly contacts the medium, making it prone to oxidation and short circuits in thermal oil or water-containing oils, and the safety gap depends on installation precision. Cast aluminum heating plates have large thermal inertia and slow heating, making them unsuitable for precise temperature control of small-volume oil tanks. The JRH-11 uses a metal tube shell enclosing an alloy resistance wire, with magnesium oxide powder insulation compacted, and the tube shell material can be carbon steel or stainless steel, with a waterproof seal at the terminal. Compared with bare wire solutions, electrical insulation is isolated by the tube shell, and the medium does not directly contact live parts; compared with cast aluminum solutions, the heat flux density per unit area is adjustable, and the heating response is more suitable for intermittent heating conditions in thin oil stations.
The internal control system of the electric heater automatically adjusts the output power based on the signal from the outlet temperature sensor, making the outlet medium temperature more uniform. The heating element is equipped with an independent overheating protection device. When the tube shell temperature or medium temperature exceeds the set range, the protection circuit cuts off the heating power to prevent material coking, deterioration, or carbonization, while reducing the risk of burning out the heating element. This protection is independent of the main temperature control circuit, reducing continuous heating caused by a single point of failure.
The JRH-11 tubular electric heater is applicable to voltages covering 220V and 380V, with power matched according to the heating medium and volume. Tube shell material: carbon steel or stainless steel. Installation type can be bolt-fixed, and the waterproof structure is suitable for high-precision thin oil station oil tank heating oil. Common applications include thermal oil circulation systems, lubricating oil stations, water medium heating tanks, and low-viscosity liquid storage tanks. When selecting, it is recommended to provide the medium name, working temperature, oil tank volume, and power supply conditions to calculate the surface load.
