1. Indoor devices or outdoor applications with protection methods;
2. Outdoor open-air installations, with wind, sand, rain, sun and other erosion;
3. It has a flammable, explosive gas or dust environment;
4. Wet tropical and dry tropical environment;
5. The temperature of the pipeline medium is above 450 °C;
6. The ambient temperature is below -20 °C;
7. Susceptible to flooding or immersion in water;
8. Environment with radioactive materials (nuclear power stations and radioactive material testing devices);
9. The environment on the ship or dock dock (with salt spray, mold, moisture);
10. Occasions with severe vibration; occasions prone to fire
