This instrument is suitable for determining the residual carbon of petroleum products according to GB/T268-87 "Determination of Residual Carbon in Petroleum Products (Kjeldahl Method)". The complete set of instruments includes ceramic crucibles, inner iron crucibles, outer iron crucibles, tripods, flame arresters, round iron covers, outer crucible tripods (supports), and spray lamps. Its main specifications are as follows:

1. Ceramic crucible: short, with a capacity of approximately 30 milliliters.

2. Inner iron crucible: made of iron sheet, with a capacity of 75 ± 5 milliliters, covered, and coated with black on the surface.

3. Outer iron crucible: made of iron sheet, with a capacity of 190 ± 10 milliliters, covered, and coated with black on the surface.

4. Tripod: Made of iron, polished with nickel chromium plating on the surface, with a height of 250 ± 10 millimeters and a ring diameter of 130 ± 5 millimeters.

5. Flame blocking body: made of cast iron, with an upper hole diameter of 89 millimeters and a lower hole diameter of 83 millimeters.

6. External crucible tripod (holder): made of 2mm stainless steel, supporting the external iron crucible.

7. Round iron cover: The material is made of 0.8mm thick iron sheet, with a lower height of 50-53mm, a middle cone height of 25mm, and an upper circular tube height of 50mm. The top is welded with a fire bridge bent into a mouth shape with a φ 3 iron wire, used as a maximum height indicator for flames, and the surface is coated with black.

8. Spray lamp: using gas spray lamp or liquefied gas spray lamp.