Glossary
Temperature Measurement Terms
Temperature terms: RTD, Pt100, thermocouples, cold junction, thermowells, response time, pyrometers and heat transfer.
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All Temperature Measurement Terms
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αAlpha CoefficientAlpha coefficient is the average change in RTD resistance per degree between 0 and 100 °C,…TermBimetallic ThermometerA bimetallic thermometer uses a coiled strip of two bonded metals with different expansion…CJCCold Junction CompensationCold junction compensation corrects a thermocouple reading for the temperature of the terminals…FormulaDew PointDew point is the temperature to which air must be cooled for its water vapour to start condensing.TermDry Block CalibratorA dry block calibrator is a portable heated or cooled metal block with inserts, used to…εEmissivityEmissivity is the ratio of radiation emitted by a surface to that of a perfect black body at…FormulaInfrared ThermometerAn infrared thermometer, or pyrometer, measures surface temperature from the infrared radiation…UInsertion LengthInsertion length is the length of a thermowell or sensor that projects into the process from…
TermITS-90ITS-90 is the International Temperature Scale of 1990, which defines temperature by fixed…LMTDLog Mean Temperature DifferenceLog mean temperature difference is the effective average temperature difference between two…MIMineral Insulated CableMineral insulated cable has sensor wires packed in compressed magnesium oxide inside a metal…FormulaNTC ThermistorAn NTC thermistor is a ceramic semiconductor resistor whose resistance falls strongly as…FormulaPt100Pt100 is a platinum RTD with a resistance of 100 Ω at 0 °C, following the IEC 60751 resistance…τResponse TimeResponse time is how fast a temperature sensor follows a step change, given as a time constant…TermRTDAn RTD is a resistance temperature detector: a metal element, usually platinum, whose…FormulaRTD Self HeatingRTD self heating is the rise in sensor temperature caused by the measuring current flowing…
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TermRTD Tolerance ClassRTD tolerance class is the permitted deviation of an RTD from the standard curve, set by IEC…FormulaRTD Wiring (2, 3 and 4 Wire)RTD wiring is the 2, 3 or 4 wire connection of an RTD; more wires cancel more of the lead wire…FormulaSeebeck EffectThe Seebeck effect is the voltage generated in a conductor along which there is a temperature…TermTemperature ClassTemperature class is the maximum surface temperature of electrical equipment in a hazardous…FormulaTemperature ScalesTemperature scales are the units used to state temperature: Celsius and Fahrenheit for everyday…FormulaTemperature TransmitterA temperature transmitter converts an RTD or thermocouple signal into a robust 4 to 20 mA or…FormulaThermal ExpansionThermal expansion is the increase in length or volume of a material as its temperature rises.FormulaThermocoupleA thermocouple is two different metal wires joined at one end; it produces a small voltage that…
TermThermocouple Extension CableThermocouple extension cable carries the thermocouple signal to the instrument using wires that…TermThermocouple Tolerance ClassThermocouple tolerance class is the permitted deviation of a new thermocouple from its…TermThermocouple TypesThermocouple types are letter codes such as J, K, T, N, E, R, S and B, each a standard pair of…TermThermowellA thermowell is a closed end tube fitted into the process that protects a temperature sensor…FormulaWake FrequencyWake frequency is the frequency of vortices shed by flow past a thermowell; if it approaches…
Frequently Asked Questions
What does the temperature measurement glossary cover?
Temperature terms: RTD, Pt100, thermocouples, cold junction, thermowells, response time, pyrometers and heat transfer.
Are the formulas checked?
Yes. Formulas follow the relevant standards such as ISO 5167, and every worked example is calculated and checked.
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