1. The altitude of the installation site does not exceed 2000m;
2. The ambient air temperature does not exceed +40°C, and its average temperature within 24 hours does not exceed +35°C;
3. When the highest temperature is +40°C, the relative humidity of the air does not exceed More than 50%; higher relative humidity is allowed at a lower temperature, and the highest relative humidity is not more than 80%;
4. Installed in non-explosive and flammable hazardous media, and there is not enough to corrode metals and damage insulation in the media Gas and dust (including conductive dust);