Temperature Sensor Application Guide

Thermocouple Material

Material Best Operational Range Good for... Not Recommended for...
J, Iron/ Constantan +32 to +1400ºF Vacuum, reducing, or inert apps Oxidizing or humid environments
K -100 to +2300ºF Oxidizing or neutral applications Use under 1000º
E +32 to +1600ºF Oxidizing or inert applications  
T, Copper/ Constantan -300 to +700ºF Oxidizing, reducing or inert apps Wet or humid environments
R, Plt 13% Rh /Plt +1000 to 3000ºF High temperatures Shock or vibrating equipment
S, Plt 10% Rh/ Plt +1000 to 3000ºF High temperatures Shock or vibrating equipment
B, Plt 30% Rh/ Ptl 6% Rh +1600 to 3100ºF High temperatures  
N, NiChroSil/ NiSil +32 to 2300ºF Similar to Type K  
C, W 5% Re/ W 26% Re +1000 to 4200ºF Inert or vacuum applications  
M, Ni 18% Mo/ Ni -50 to +2500ºF Inert, vacuum or hydrogen apps Constant cycling of temperature

Tubing, Sheath, Protection Tube, and Thermowell Materials

Material Best Operational Range Good for... Not Recommended for...
304 Stainless Steel -300 to 1650ºF Oxidizing or neutral applications  
316 Stainless Steel -300 to 1700ºF Oxidizing or neutral applications  
Inconel 600 +32 to 1900ºF Oxidizing or reducing apps Sulfurous environments > 1000ºF
Inconel 601 +32 to 2300ºF Oxidizing or reducing apps  
Wrought Iron +32 to 1200ºF Oxidizing or reducing apps  
Cast Iron +32 to 1300ºF Oxidizing or reducing apps  
Seamless Steel +32 to 1000ºF Oxidizing or reducing apps  
Mullite (63% Alumina) +32 to 2700ºF High temperatures Mechanical shock
Alumina (>99% Al2O3) +32 to 3400ºF Induction melting, vacuum Mechanical or thermal shock
Silicon Carbide +32 to 3000ºF Secondary protection tube  

Wire, tubing insulation

Material Best Operational Range Good for... Not Recommended for...
Fiberglass Braid -100 to 800ºF General purpose use Damp or wet areas
PVC +32 to 250ºF Extension wiring High temperature areas
Teflon -50 to 500ºF Wet or corrosive areas High temperature areas
Magnesium Oxide (MgO) -100 to +2100ºF high temperatures, rugged environments