What Are Ceramic Protection Sheaths?
Overview
Ceramic protection sheaths are a ceramic sheath tube covering, often made from technical ceramics such as aluminous porcelain and recrystallised alumina, used to shield a temperature sensor from the environment they are immersed in. They are generally used in temperature sensors at very high temperatures from between 1000 to 1750°C. Some ceramic protection sheaths provide a very high electrical resistance so may be suitable for high voltage applications.
For applications where ceramic protection isn’t suitable, metal protection sheaths can be used up to limited temperatures.
Materials
Typical materials include:
- Aluminous porcelain – cost-effective, good thermal and chemical resistance.
- Recrystallised alumina – higher purity and strength, suitable for extremely high temperatures.
These materials offer excellent thermal stability and resistance to chemical attack, making them ideal for furnace or kiln applications.
Applications
- High-temperature measurement: Ideal for temperatures from 1000°C to 1750°C.
- Electrical insulation: Some ceramic sheaths provide very high electrical resistance, making them suitable for high-voltage environments.
- Harsh chemical environments: Resistant to corrosive gases and molten materials.
For applications where ceramic sheaths are unsuitable (e.g., lower temperatures or mechanical shock tolerance), metal protection sheaths can be used, but these are limited to lower temperature ranges.
Key Advantages
- High thermal stability – withstands extreme temperatures without degrading.
- Chemical resistance – ideal for aggressive or oxidising environments.
- Electrical insulation – protects sensors in high-voltage applications.
- Customisable – can be tailored to sensor diameter, length, and process requirements.
If you want to order a temperature sensor or you are unsure exactly what you need, get in touch and we can help you.