Product Overview
High-purity graphite thermocouple protection tubes are essential components in high temperature furnaces and molten metal applications. With excellent thermal conductivity, corrosion resistance, and high temperature stability, graphite protection tubes shield thermocouples from corrosive atmospheres, molten metals, and mechanical damage, ensuring accurate and reliable temperature measurement.
Key Features
- Excellent thermal conductivity for fast response
- High temperature resistance up to 3000°C
- Corrosion resistant to molten metals and salts
- Good thermal shock resistance
- Available in various diameters and lengths
- Closed-end or open-end designs available
- Custom fittings and mounting options
Technical Specifications
| Parameter | Unit | Value |
|---|---|---|
| Material | - | Isostatic / Molded Graphite |
| Bulk Density | g/cm³ | 1.70 - 1.85 |
| Outer Diameter | mm | 6 - 50 |
| Inner Diameter | mm | 4 - 40 |
| Max Length | mm | 1500 |
| Max Working Temp | °C | 2500 (inert/vacuum) |
| Straightness | mm/m | 0.3 |
| Wall Thickness Tolerance | mm | ±0.1 |
Applications
- Thermocouple protection in high temperature furnaces
- Molten aluminum and zinc temperature measurement
- Salt bath furnace thermocouple protection
- Vacuum furnace temperature sensing
- Molten glass temperature measurement
- Heat treatment furnace temperature control
- Foundry and metal melting applications
Why Choose Jincheng Thermocouple Tubes?
We manufacture precision graphite thermocouple protection tubes for furnace builders, foundries, and heat treatment companies. Our tubes are precision drilled with consistent inner diameters for proper thermocouple fit. We offer standard sizes as well as custom lengths, closed-end designs, and mounting fittings.
FAQ
Q: How long do graphite thermocouple protection tubes last?
A: Tube life depends on the application. In furnace atmosphere, graphite tubes can last for months. In direct contact with molten metals, life is shorter and depends on metal temperature and chemistry. Regular inspection of tube wall thickness is recommended for critical applications.
Q: Can you produce closed-end thermocouple tubes?
A: Yes, we produce both open-end and closed-end (blind hole) graphite thermocouple tubes. Closed-end tubes provide complete isolation of the thermocouple from the process environment. Please specify your required inner diameter, outer diameter, and overall length when ordering.
Q: What is the response time of graphite thermocouple tubes?
A: Graphite has excellent thermal conductivity, so response time is fast compared to ceramic protection tubes. Thin-wall graphite tubes provide the fastest response, while thicker walls provide longer life. The optimal wall thickness depends on your balance of response speed and durability requirements.
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