thermocouple & pt100 sensors - Peak Sensors

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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

 



Recrystalised Alumina (Alsint)
 A pure and tough ceramic exhibiting hardness and vacuum tightness. Excellent in oxidising and reducing atmospheres. Fair thermal shock resistance. Used with R, S and B thermocouples.

Basic Composition Al 2O 3 99.7%
Temperature Limits 1750 ° C
International Standards DIN VDE 0335 C799
Density 3.9 g/cm³
Melting Range 2072
Specific Heat  
Coefficient of Expansion 8 x10-6 / ° C
Thermal Conductivity 26 W/m ° C
Peak Sensors Colour Code  


Aluminous Porcelain (Pythagoras)
 Good thermal shock resistance. Used with J, K, N and E conductors.
Basic Composition Al 2O 3 60%
Temperature Limits 1500 ° C
International Standards DIN VDE 0335 C610
Density 2.6 g/cm³
Melting Range  
Specific Heat  
Coefficient of Expansion 6 x10-6 / ° C
Thermal Conductivity 2 W/m ° C
Peak Sensors Colour Code  


Sillimanite 60
 Very good thermal shock resistance. Porous.
Basic Composition Al 2O 3 73 to 75%
Temperature Limits 1600 ° C
International Standards DIN VDE 0335 C530
Density 2.35 g/cm³
Melting Range  
Specific Heat  
Coefficient of Expansion 5.7 x10-6 / ° C
Thermal Conductivity 1.4 W/m ° C
Peak Sensors Colour Code  


Silicon Carbide (Clay Bonded)
 Excellent thermal shock resistance. Tends to have a thick wall to improve strength. A porous material that usually has a lining refractory for platinum sensors. High thermal conductivity. Not suitable for highly oxidising atmospheres.
Basic Composition SiC 70 – 90 %
Temperature Limits 1400 ° C
International Standards  
Density 2.4 g/cm³
Melting Range  
Specific Heat  
Coefficient of Expansion 5.0 x10-6 / ° C
Thermal Conductivity 28.0 W/m ° C
Peak Sensors Colour Code  


Silicon Carbide (Recrystalised)
 Excellent thermal shock resistance. A porous material that usually has a lining refractory for Platinum sensors. High thermal conductivity.
Basic Composition SiC 99%
Temperature Limits 1600 ° C in oxidising atmosphere, 2000 ° C in protected atmosphere
International Standards  
Density 2.6 to 2.7 g/cm³
Melting Range  
Specific Heat  
Coefficient of Expansion 4.5 x10-6 / ° C
Thermal Conductivity 30.0 W/m ° C
Peak Sensors Colour Code  


Syalon 101
 A strong and thermal shock resisting material for use in molten metals with little wetting or dross build up. Good in molten aluminium or salt baths. Fairly expensive.
Basic Composition Silicon Nitride, Aluminium Oxide
Temperature Limits 1000 ° C (1250 ° C in controlled conditions)
International Standards  
Density 3.26 g/cm³
Melting Range  
Specific Heat  
Coefficient of Expansion 3.2 x10-6 / ° C
Thermal Conductivity 16.7 W/m ° C
Peak Sensors Colour Code  


Quartz
 Low coefficient of expansion, High thermal shock resistance.
Basic Composition SiO 2
Temperature Limits 1500 ° C (Then flows under own weight)
International Standards  
Density 2.2 g/cm³
Melting Range 1683 ° C
Specific Heat 670 J/Kg ° C
Coefficient of Expansion 5.5 x10-7 / ° C
Thermal Conductivity 1.4 W/m ° C
Peak Sensors Colour Code