Product Details

Stainless Steel Electric Heating Tube
1. Stainless steel electric heating tubes should be stored in a dry warehouse. If they are placed for a long time and the surface becomes damp, use a megohmmeter to measure the insulation resistance before use. If it is less than 1 megohm/500 volts, the heating tube should be placed in a drying oven at 200 degrees for drying.
2. Before installation and use of stainless steel electric heating tubes, the relevant instructions should be read in detail, especially the heating tube medium. It should be ensured that the medium has no corrosive effect on the stainless steel electric heating tube material. Avoid damage due to incorrect operation.
Maintenance during use:
1. The terminals of stainless steel electric heating tubes should be kept clean and dry; otherwise, insulation performance will be reduced and short circuit breakdown may occur. If used in environments with chemical corrosion, flammable, explosive liquids or gases, the terminal part of the heating tube should be protected with an insulating sealing device to prevent accidents. When wiring, use two nuts to tighten relatively, do not use excessive force to avoid loosening the lead-out screw and damaging the heating tube.
2. The heating part of the stainless steel electric heating tube should be fully immersed in the heating medium to avoid heat dissipation not being fast enough and exceeding the allowable heating temperature, causing damage to the heating tube. In addition, the lead-out part of the wiring should be exposed outside the insulation layer of the heater or outside the heater, so that this part is not overheated and damaged.
3. When heating certain adhesives such as sodium nitrate, stearic acid, paraffin, etc., the power supply voltage should be reduced at the beginning of heating to reduce the heat generation of the heating tube. After all is melted into liquid, then raise to the rated voltage (the voltage should not exceed 10% of the rated voltage indicated on various heating tubes; if applied below the rated voltage, the heat generated by the heating tube will also decrease accordingly) for heating.
4. The longer the stainless steel electric heating tube is used, if thick scale or oil scale accumulates on the surface, it should be removed regularly; otherwise, the heat transfer performance of the heating tube will be reduced, causing the surface heat load to exceed the rated allowance and damage.

Testing Standards

1. Power input test: Apply rated voltage, the power deviation shall not exceed the table below

Rated power input Rated Input Power (W)	Deviation Deviation
W≦200	±10%
W>200	Positive deviation: +5% or 20W (whichever is greater) Negative deviation: -10%

2. Electrical strength test:
a. Electrical strength under cold state: Withstand 50Hz, 1min voltage withstand, cut-off current 5mA, no breakdown or flashover.
Rated voltage Test voltage
250V 1250V
b. Electrical strength at working temperature: Withstand 50Hz, 1min voltage withstand, cut-off current 5mA, no breakdown or flashover.
Rated voltage Test voltage
250V 1000V
3. Leakage current at working temperature
Under full heat dissipation conditions, with 1.15 times rated power input, leakage current 0.5mA.
4. Overload test
Under full heat dissipation conditions, apply 1.27 times rated power for 1 hour, then cool for 0.5 hours to room temperature (forced cooling allowed), repeat 30 cycles, no damage occurs.
5. Heating tube shell sealing test (tube crack test)
Immerse the heating tube in acidified water (2%~3% hydrochloric acid, sulfuric acid or nitric acid) for 3 hours, the two ends of the heating tube should be at least 5mm above the liquid surface. After the test, it should meet the performance requirements of items 2~3.
6. Seal sealing test
Place the heating tube in an environment with a temperature of 60℃ and humidity of 95% for 24 hours. After placement, it should meet the performance requirements of items 2~3.
7. Life test
Under full heat dissipation conditions, apply rated voltage for 1 hour, then cool for 0.5 hours to room temperature (forced cooling allowed), cumulative working time up to 3000 hours.