Lives International Thermocouple Systems
Type R Thermocouples
-50 to +1480°C
R type thermocouples, or platinum rhodium thermocouples have a low sensitivity (~10 µV/°C) and because of the high cost, they are used mostly for very high temperature applications. Their temperature measurement capability ranges from -50®C up to 1480®C.
Type J Thermocouples
-40°C to 750°C
Type J thermocouples, or iron–constantan thermocouples have a quite narrow range (from −40 °C to +750 °C) but have a higher sensitivity of about 50 µV/°C. The upper limit of this type of thermocouple is determined by the Curie point of the iron, which is 770 °C.
Type K Thermocouples
-200 to +1250°C
The type K thermocouple is accurate, reliable and it covers a wide temperature range (from –200°C to 1250°C). It's inexpensive and is the most common type of thermocouple.