Discussion on the application of sapphire protection tube in thermocouple

Sapphire protection tube is directly grown from sapphire single crystal at one time. It is very suitable to replace corundum thermocouple protection tube as a thermocouple protection tube. It is also suitable for other applications in harsh high temperature and high pressure environments, similar to sapphire thermocouple protection sleeves. The tube has become a thermocouple protection tube instead of corundum.

Sapphire protection tube is directly grown from sapphire single crystal at one time. It is very suitable to replace corundum thermocouple protection tube as a thermocouple protection tube. It is also suitable for other applications in harsh high temperature and high pressure environments, similar to sapphire thermocouple protection sleeves. The tube has become a thermocouple protection tube instead of corundum.

Sapphire tube, sapphire thermocouple protection tube characteristics

1. Excellent resistance to heat and pressure: The sapphire tube can withstand high temperatures up to 2000 degrees Celsius, high pressure and chemical corrosion, and has better chemical resistance than corundum protection tubes.

2. Ultra-high purity: The sapphire tube adopts single-crystal growth and one-time forming technology, and the purity is as high as 99.995%. The ultra-high purity ensures the performance advantages of sapphire.

3. Ultra-high hardness and durability: The hardness of the sapphire tube is as high as Mohs9, and it has strong resistance to stabs.

4. Extremely strong air tightness: The sapphire tube adopts one-time molding, has 100% air tightness, prevents residual gas penetration and is resistant to chemical gas corrosion, and its performance far exceeds the corundum thermocouple protection tube.

The sapphire thermocouple protection tube is composed of an external one-sided sealed protection tube and one or more internal capillary tubes. The capillary tube inside the thermocouple protection tube is used to isolate the branch flow of the thermocouple. Because the sapphire crystal has excellent optical transparency and no voids, the thermocouple protection tube has good high temperature resistance and atmospheric isolation (prevent gas from entering the thermocouple) and excellent heat insulation.

Thermocouple protection tube application

In view of the above-mentioned excellent characteristics of the thermocouple protection tube, it is an excellent material for extreme environments such as high temperature (2000 degrees Celsius). Thermocouple protection sleeves have special application advantages in chemical industry, oil refining, glass industry and laboratories.

The sapphire thermocouple protection tube can be used in environments where the emery ceramic tube cannot meet the stability requirements. It can be used for temperature measurement in heavy oil combustion reactors, hydrogen production, glass boxes, blast furnaces, inorganic acids (mineral acids) and metallurgical processes.

The sapphire thermocouple protection tube completely replaces the ceramic tube because it has good resistance to metal reaction. Some metals react with the lead-containing ceramic tube, which makes the ceramic tube easy to be damaged. For example, there is such a problem in the blast furnace for the production of lead glass. There is no such problem when using sapphire thermocouple protection tube.