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Thermocouple Assembly Terms

Ambient Temperature – The temperature of the air surrounding the equipment.
 
Base metal – Any metal other than precious metal, such as copper, aluminum, lead, nickel and tin.
 
Btu -- British thermal unit; a cuit for measuring a quantity of heat. 1 btu is the amount of heat required to raise the temperature of 1 pound of water 1°F.
 
Calibration – Adjusting the equipment so readings and accepted measurements are correlated so the value is accurate.
 
Celsius (centigrade) - A temperature scale defined by 0 °C at the ice point and 100 °C at boiling point of water at sea level.
 
Color Code – Established by ANSI to distinguish wires for thermocouples.
 
Compensating Alloys – Alloys with similar thermoelectric properties to the alloys in the thermocouple, used to connect the thermocouple to the instrument.
 
Deviation - The difference between the value of the controlled variable and the value at which it is being controlled.
 
Fahrenheit -The temperature scale defined by 32° at the ice point and 212° at the boiling point of water at sea level.
  
Joule – Unit of thermal energy.
 
Junction – In a thermocouple where two different metals are joined.
 
Latent Heat - Expressed in BTU per pound. The amount of heat needed (absorbed) to convert a pound of boiling water to a pound of steam.
 
Noble metal – A metal with high resistance to chemical effect, especially corrosion and solution by organic acids; occasionally called precious metal.
 
Probe - A generic term that is used to describe many types of temperature sensors .
 
Refractory metal – Metal containing a coating consisting of material with a high melting point. Used in high temperature capacity thermocouple devices.
 
Radiationange --The transmission of energy by electromagnetic waves and may become thermal energy when absorbed and increase in the temperature of the absorbing body.
 
RTD - Stands for Resistance Temperature Detectors.
 
Sensitivity - The minimum change in a physical variable to which an instrument can respond.
 
Sterling Cycle - Thermodynamic cycle commonly used to cool thermo graphic detectors.
 
Therm - A measurement of heat equal to 100,000 btu.             
 
Thermocouple - Measures the difference in potential created at the junction of two different metal wires which feed from the measuring instrument. ( http://www.thermocouple-assemblies.com )
 
Thermopile – Many Thermocouples grouped together in a series to increase the thermoelectric output.