There are many kinds of popular thermocouple protection tubes on the market, depending on the customer’s different applications, working temperature, materials, and use environments. And for use in the cast aluminium furnace or industry, they are also very widely used.
Do you know which thermocouple protection tubes can be used for casting aluminium industry?
According to different customers’ needs, we recommend the following popular protection tubes.
- Silicon Carbide Thermocouple Protection tube (Also called SiC Tube)— max temperature 1400℃.
This Silicon Carbide Thermocouple Protection tube Si3N4 content >92%, hardness >92, due to the very high hardness, used in aluminium solution, the life time can usually reach at least 1 year. It is popular among customers due to its long life.
The popular standard sizes are.
| OD(mm) | ID(mm) | Length(mm) |
| 16 | 8 | From 250mm-950mm |
| 22 | 12 | From 300mm-1000mm |
| 28 | 16 | From 300mm-1600mm |
| 30 | 18 | From 300mm-1600mm |
| 45 | 25 | From 300mm-1600mm |
2. Enamel Cast Iron Thermocouple Tube— max temperature 900℃.
High carbon cast iron thermocouple protection tube with black or red enamel coating, specially used for melting aluminum and aluminum processing industry, keeping furnace combustion chamber, chute, ladle and other casting areas.
Cast Iron Thermocouple Tube Standard Sizes
Red Enamel Coating:
Outer Diameter 40mm Inner Diameter: 12mm Thread: 3/4NPT
Outer Diameter 43mm Inner Diameter: 22mm Thread: 3/4NPT
Black Enamel Coating: Outer Diameter 43mm Inner Diameter: 22mm Thread: 3/4NPT
The one of the advantage is the length can be as long as 108″.
3. Nitride Bonded Silicon Carbide Thermocouple Tube (also called NSIC) — max temperature 1450℃.
Application: in the thermometric system of nonferrous metal melting furnace.
Parameter:
| Density | 2.8 g/cm3 |
| Porosity | ≤16% |
| Phase composition | β-Si3N4, Oxide |
| SiC | 72% |
| Si3N4 | 21% |
| compressive strength | 140MPa |
| flexure strength | 35MPa |
| Thermal conductivity | 16 w/m*k |
Nitride Bonded Silicon Carbide Thermocouple Tube is also a cheaper choice to replace the Silicon Carbide Thermocouple Protection tube, because this tube price is much cheaper, receives a wide range of customer favourites.
All above three kinds of thermocouple protection tubes for the cast aluminium industry are widely used, and customers in different areas will prefer to different ones. Silicon nitride tubes are more popular in Europe. Cast iron tubes are sold more in America
.Which one do you prefer to use?
