1.Ambient temperature: 15 ℃ ~ 25 ℃; 

2. Relative humidity: ≤ 85%; 

3. Power supply voltage and power: 220V 50Hz 100W; 

4. Air source: commercial propane with purity no less than 95% can also be replaced by liquefied petroleum gas for ordinary test (Note: the air source and connector are provided by the user); 

5. Bunsen lamp applies flame to the pattern for 15s 

6. Single chip microcomputer control and digital display. 

7. Burner aperture: Φ 0.17mm, the flame length of Bunsen lamp is 20mm ± 1mm, and the burner can be inclined by 45 °. 

8. Apply flame (1s-99s) ± 0.5s to the sample, which can be adjusted arbitrarily, with an accuracy of ± 0.2S. 

9. Combustible gas source: propane with purity above 95%. (Note: the air source and connector are provided by the user)