thermocouple & pt100 sensors - Peak Sensors

You are here: Technical Information > Protection Sheath Material Datasheets

Protection Sheath Material Datasheets

Materials specification for temperature sensor protection sheaths

Our temperature sensors are specifically designed for many different types of harsh and reducing atmosheres and therefore we supply protection sheaths suitable for each application. Here is a list of datasheets for the materials that we supply and use.

 

Mild Steel 4C54, Ferritic, 446 SS Platinum Grain Stabilised
321 SS Sanicro 31 HT® Hastelloy C276
310 SS Alloy 600 (Inconel®) Kanthal AF, Kanthal APM
316 SS Alloy 800 HT (Incoloy®) Recrystalised Alumina (Alsint)
353 MA® Platinum 10% Rhodium Aluminous Porcelain (Pythagoras)
253 MA® Kanthal Super Silicon Carbide (Clay Bonded)
Pyrosil Sillimanite 60 Silicon Carbide (Recrystalised)
Platinum Quartz Monel 400
Cast Iron Brass Hastelloy B2
Syalon 101 Platinum 10% Rhodium Grain Stabilised

 

Mild Steel
Ceramic support tube (Plated) Occasional sensor protection use
Basic Composition Fe, C
Temperature Limits 550 ° C
International Standards Seamless Pipe
Density 7.9 g/cm³
Melting Range  
Specific Heat  
Coefficient of Expansion  
Thermal Conductivity  
Peak Sensors Colour Code Black


446, 4C54, Ferritic
Very good resistance to sulphurous gases and salts. Good resistance to oxidation in air. Good resistance to oil ash corrosion, molten copper, lead, tin. In sulphurous reducing atmosphere 446 performs better than austenitic steels, although Nitrogen concentrations can result in early failure. Hot gases containing hydrocarbons and carbon monoxide can cause carburisation, if oxygen is present for an oxide layer to form 446 performs well, otherwise failure occurs quickly.
Basic Composition Cr 26.5%, Mn 0.8%, Si 0.5%, N 0.2%, C 0.2% Max, P 0.03 Max, S 0.15 Max, Bal Fe
Temperature Limits 1100 ° C in air and oxidising conditions
International Standards 1.4749, 446-1
Density 7.6 g/cm³
Melting Range  
Specific Heat 460 rising to 670 J/Kg ° C
Coefficient of Expansion 13.5 x10-6 / ° C
Thermal Conductivity 17 rising to 28 W/m ° C
Peak Sensors Colour Code Blue

Kanthal AF, Kanthal APM
High resistance to attack by sulphur. Resists carburisation at temperature. Very little scaling reduces furnace contamination. Better heat transfer than ceramic.
Basic Composition Cr 22%, Al 4-6%, Fe Balance.
Temperature Limits 1400 ° C
International Standards  
Density 7.1 g/cm³
Melting Range  
Specific Heat  
Coefficient of Expansion 12 rising to 16 x10-6 / ° C
Thermal Conductivity 12 rising to 32 W/m ° C
Peak Sensors Colour Code  


Kanthal Super
Less brittle than ceramics. Excellent in corrosive furnaces. Suppresses electromagnetic oscillations.
Basic Composition Moloybdenum disilicade MoSi 2
Temperature Limits 1700 ° C
International Standards  
Density  
Melting Range  
Specific Heat  
Coefficient of Expansion  
Thermal Conductivity  
Peak Sensors Colour Code  


Cast Iron
Inexpensive material used in molten aluminium. It has a relatively short life due to oxidation but other materials also have their drawbacks in this application. Brittle metal.
Basic Composition Fe, C (3 to 3.5%)
Temperature Limits 900 ° C in Aluminium
International Standards  
Density 7.9 g/cm³
Melting Range  
Specific Heat  
Coefficient of Expansion  
Thermal Conductivity  
Peak Sensors Colour Code