thermocouple
Noun: A thermocouple is a temperature-measuring device. It consists of two wires made of different metals that are joined together at both ends to form a complete electrical circuit. One junction (the measuring junction) is placed where the temperature needs to be measured. The other junction (the reference junction) is kept at a known, fixed temperature. A small electric current is generated in the circuit, and the strength of this current is directly related to the temperature difference between the two junctions. This principle allows the thermocouple to function as a thermometer.
A thermocouple is used to measure temperature in scientific, industrial, and commercial applications. It is known for its wide temperature range, durability, and fast response time. * The engineer installed a thermocouple inside the furnace to monitor its operating temperature. * For accurate readings, the reference junction of the thermocouple must be maintained at a constant temperature. * The data from the thermocouple indicated a sudden drop in the system's temperature.
- Thermocouple Types: Common thermocouples are designated by letters (e.g., Type K, Type J, Type T), which indicate the specific metal alloys used (e.g., chromel-alumel for Type K). Each type has different temperature ranges and characteristics suitable for various environments.
- Thermocouple Probe: The term often refers to the entire assembly, which includes the metal junctions housed inside a protective metal sheath or probe for insertion into a medium (like a liquid or gas stream).
- Thermopile (noun): A device that contains multiple thermocouples connected in series to increase the output voltage or sensitivity, often used in scientific instruments for measuring radiant heat.
- Thermoelectric (adjective): Relating to the direct conversion of temperature differences into electric voltage and vice versa, which is the fundamental principle behind a thermocouple.
- Thermoelectric thermometer: A more technical term describing its operating principle.
- Temperature sensor: A broader category of devices that includes thermocouples, resistance temperature detectors (RTDs), and thermistors.
- Seebeck effect: The physical phenomenon where a temperature difference between two dissimilar electrical conductors or semiconductors produces a voltage difference. This is the effect that allows a thermocouple to generate an electrical signal.
- Cold junction compensation: The process in the measuring instrument to account for the temperature at the reference junction to ensure the reading reflects only the temperature at the measuring junction.
- a kind of thermometer consisting of two wires of different metals that are joined at both ends; one junction is at the temperature to be measured and the other is held at a fixed lower temperature; the current generated in the circuit is proportional to the temperature difference