Self-limiting temperature electric heating tape is a heating tape that can automatically limit the heating temperature and automatically adjust the output power as the temperature of the heated system changes. Its detection method mainly includes the following steps:

1. Appearance and size inspection
Check the appearance: Observe whether the surface of the electric heating tape is flat and smooth and whether there are defects such as damage and deformation.
Measure the size: Use tools such as vernier calipers and micrometers to measure the length, width, thickness and other dimensions of the electric heating tape to ensure that they meet the standard requirements.
2. Resistance value detection
Prepare tools: Use a resistance tester for measurement.
Test method: Contact the two test probes of the resistance tester to the two ends of the electric heating tape, read the resistance value, and check whether it meets the standard requirements.
3. Insulation resistance detection
Prepare tools: Use an insulation resistance tester for measurement, usually select a test voltage of DC500V or DC1000V.
Test method:
For electric heating tapes with metal shielding layers, a voltage should be applied between the two connected wires and the metal braided layer to read the insulation resistance value.
For electric heating cables without metal shielding, they should be immersed in water (the conductors at both ends are exposed to the water surface), and voltage should be applied between the two connected wires and the water to read the insulation resistance value.
The insulation resistance value should not be less than the specified standard value to ensure that the insulation performance of the electric heating cable is good.
IV. Temperature characteristic detection
Install the simulated pipeline: install the electric heating cable on the simulated pipeline and pass the rated current.
Measure the temperature: Use an infrared thermometer to measure the maximum surface temperature of the electric heating cable and check whether it meets the standard requirements. This helps to ensure that the electric heating cable does not overheat under normal working conditions.
V. Stability and reliability detection
Continuous operation test: Install the electric heating cable on the simulated pipeline, pass the rated current, and run continuously for a period of time (such as hours or days).
Monitoring parameters: During the operation, measure the resistance value and maximum surface temperature value of the electric heating cable at regular intervals to check whether it is stable and reliable. This helps to evaluate the performance of the electric heating cable in long-term operation.
VI. Corrosion resistance detection
Immersion test: Soak the electric heating cable in corrosive media such as acid, alkali, and salt for a period of time (such as hours or days). Check the appearance: After removing the electric heating cable, rinse it with clean water, and then use visual inspection to check whether there is any corrosion on its appearance. This helps to evaluate the durability of the electric heating cable in a corrosive environment.
In summary, the inspection methods of self-limiting temperature electric heating cables include appearance and size inspection, resistance value inspection, insulation resistance inspection, temperature characteristic inspection, stability and reliability inspection, and corrosion resistance inspection. These inspection methods together constitute a comprehensive system for the inspection of self-limiting temperature electric heating cables to ensure that their quality and performance meet the standard requirements.