1. Compressed air should be used for power, with a pressure range of 0.2 to 0.7 Mpa;

2. The temperature of the conveying medium shall not exceed 40 ℃;

3. The pH of the conveying medium is within the range of 4-10;

4. Larger diameters containing solid particles shall not exceed 6-9mm, and their volume concentration shall not exceed 2%;

5. Environmental temperature: -20 ℃ to 50 ℃;

6. Environmental humidity: ≤ 95% (when the ambient temperature is+25 ℃);

7. Atmospheric pressure: 80kPa~106kPa;

8. Suitable for hazardous locations of coal dust and methane explosive gases underground in coal mines, but without corrosive gases that damage insulation.