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Graphite rotors and shafts machined to drawing for degassing units.
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Thermocouples and Protection Tubes
Thermocouples and protection tubes for molten aluminium temperature control
Overview
What it is and where it works
Thermocouples and protection tubes for measuring molten aluminium in melting and holding furnaces, ladles and launders. The element (often type K) sits inside a tube of cast iron or a technical ceramic, where silicon nitride and sialon give the best life to price ratio, which must resist aluminium attack and thermal shock. We sell both full assemblies and tubes only, to your length and fitting.
- Element types
- K, N, J, E, T, R, S, B available; simplex, duplex or triplex
- Tube materials
- Silicon nitride and sialon (best life to price ratio); cast iron, clay-bonded silicon carbide and alumina-mullite on request
- Cast iron tubes
- Coated cast iron tubes tend to dissolve in aluminium and need frequent recoating, which is why ceramics replaced them in many plants
In your plant
Where It Is Used
- Melting and holding furnace bath control
- Dosing and low pressure furnaces
- Ladles, launders and transfer troughs
To quote, we need
Send Us These Data Points
With this information we can ask the right factories and come back with a proposal that fits your process. Missing something? Send what you have: we fill the gaps together.
Request a Quote Printable checklist to fill with your plant teamWe reply in English, Spanish, Italian or Chinese.
- Thermocouple type and number of elements
- Immersion length and tube outside diameter
- Tube material preference or current tube and its life
- Head, connector and mounting fitting
- Controller or instrument it connects to
- Quantity per year
One supplier, one shipment
Often Quoted Together
Need something different? We adapt sizes, materials and specs to your drawing.
Further reading
From Our Insights
Buyer questions
Frequently Asked Questions
Can I buy only the protection tube?
Yes. Send the outside and inside diameter, length and fitting so the tube matches your existing element.
Why do my cast iron tubes fail so fast?
Molten aluminium dissolves iron, so cast iron tubes rely on a coating that must be renewed. Ceramic tubes avoid this but need care against thermal and mechanical shock.
