● Surrounding air temperature ○ Upper limit of surrounding air temperature+40 ℃; ○ Lower limit of ambient air temperature -5 ℃; The average temperature of the surrounding air for 24 hours shall not exceed+35 ℃. ● Altitude: The altitude of the installation site shall not exceed 2000m. ● Atmospheric conditions: The relative humidity of the atmosphere does not exceed 50% when the ambient air temperature is+40 ℃; At lower temperatures, there can be higher relative humidity; The monthly average maximum relative humidity of the wettest month is 90%, and the monthly average minimum temperature of that month is+25 ℃, taking into account the condensation that occurs on the surface of the product due to temperature changes. Pollution level: The pollution level is level 3.