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Thermocouples & RTD's are only part of the system, of equal importance is the design of the temperature probes used to physically measure the item.
Resistance temperature detector (PT100 or RTD) probes consist of flat film or a wire wound platinum resistance sensor element. The measurement resistance value changes in line with the temperature being measured.
Thermocouple probes consist of two wires of dissimilar metals or metal alloys welded together. Thermocouples are based on the thermoelectric (Seebeck) effect. there are various types of thermocouples, types K and J being the most common industrial types used.
Type K and J thermocouple probes are fast to respond to changes in temperature and they also have a wide measurement range. Resistance temperature detector probes are slower to respond to changes in temperature, but are generally more accurate.
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