A thermocouple is a union of dissimilar metals in which a voltage, usually in micro or millivolts, is generated due to a change in temperature.
A thermocouple is a temperature-sensing junction formed by joining two dissimilar metals. When the junction experiences a change in temperature, a small voltage, typically in the microvolt or millivolt range, is generated between the two metals, an effect known as the thermoelectric or Seebeck effect. Because this voltage varies predictably with temperature, the thermocouple can be used to measure temperature accurately over a wide range.
The two dissimilar metals are chosen for the temperature range and sensitivity required, and standardized combinations produce known voltage-versus-temperature relationships. The small signal a thermocouple produces must be carried to an instrument without corruption to yield an accurate reading.
In commercial and industrial settings, thermocouples measure temperature in equipment, processes, and ovens. The low-level signals they generate are carried by specialized thermocouple wire that preserves the measurement.
Because the two dissimilar metals are chosen for the temperature range and sensitivity required, standardized combinations produce known voltage-versus-temperature relationships, and the small signal a thermocouple produces must be carried to an instrument without corruption to yield an accurate reading.
Recognizing how a thermocouple generates a temperature-dependent voltage helps in understanding temperature sensing, with the small signal carried by specialized thermocouple wire that preserves the measurement across commercial and industrial monitoring systems.
At Windy City Wire, the focus on quality instrument and thermocouple wire supports accurate temperature measurement. Supplying wire matched to the thermocouple type helps preserve the small signals that thermocouples generate across commercial and industrial monitoring systems.