Technical specifications:
Type B (Platinum / Rhodium)
Suited for high temperature measurements up to 1800°C. Unusually type B thermocouples (due to the shape of their temperature / voltage curve) give the same output at 0°C and 42°C. This makes them useless below 50°C.
Type K (Chromel / Alumel)
Type K is the 'general purpose' thermocouple. It is low cost and, owing to its popularity, it is available in a wide variety of probes. Thermocouples are available in the -200°C to +1300°C range. Sensitivity is approx 41uV/°C. Use type K unless you have a good reason not to.
Type R (Platinum / Rhodium)
Suited for high temperature measurements up to 1720°C. Low sensitivity (10uV/°C) and high cost makes them unsuitable for general purpose use.
Type S (Platinum / Rhodium)
Suited for high temperature measurements up to 1720°C. Low sensitivity (10uV/vC) and high cost makes them unsuitable for general purpose use. Due to its high stability type S is used as the standard of calibration for the melting point of gold (1064.43°C).
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