| A.N.S.I. |
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American National Standards Institute is sponsored by the "American Society of Mechanical Engineers". Using approved and proven procedures, they set the standards for the construction of power and process plants.
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| A.S.A. |
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American Standards Association is sponsored by the "Instrument Society for Testing Materials". The focus of this technical organization is primarily in the area of thermocouples. Their mission is to develop guidelines for the manufacture of temperature and other measurement equipment.
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| A.S.M.E. |
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American Society for Mechanical Engineers.
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| A.S.T.M. |
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American Society for Testing and Materials.
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Abrasion Resistance
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Ability to resist mechanical wear.
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| Absolute Zero |
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The Temperature at which thermal energy is minimum & defined As Zero Kelvin; Calculated To Be -273.15 Degree C Or -459.67 Degree F.
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| Accessories |
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A range of products supplied by Tyco Thermal Controls for making thermocouples & RTD's or used for connecting them to the process to be measured
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| Accuracy |
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A statement that is used to define the largest allowable error in a device or system. It is an indication of how close measured values are to true values. It can be expressed in both measured units and in percentages.
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| Alloy #11 |
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A Harrison Alloys trademark for a low-cost negative thermoelement used with copper for a compensating extension wire used with thermocouple types R and S. The EMF characteristics are similar to R and S up to approximately 200°C.
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| Alpha |
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Used to indicate correlation between resistance and temperature change. Typical values for platinum are .00385055 (DIN Standard), .003902 (American Standard), and .00392 (Department of Defense Standard).
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| Alpha |
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Temperature Coefficient Of Resistance In Ppm Or Units Of Ohms Per Ohm Per Deg. C, Over The Fundamental Interval Of 0-100 Deg. C. Ex: Platinum Rtd Per Din 43760: 0.00385 Ohms/Ohm/Deg C.
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| Alpha (-) |
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The temperature coefficient of resistance of a material, derived from measurements at 0°C and at 100°C: {R sub{100} - R sub{0}} over {100 times R sub{0}}. It indicates the basic change in resistance in a material for each °C change in temperature. It is a defining parameter for resistance temperature detectors (RTD's).
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| Alumel |
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Trade name for an alloy of nickel with up to 5% aluminium, manganese and silicon, used as the negative leg of K-type thermocouples.
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Ambient Temperature
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The mean temperature of the air surrounding the instruments under test.
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| Ampere |
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Abbreviation A. SI unit of electric current
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| Amplifier |
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A circuit that produces a larger output power, voltage or current than was applied at its input.
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| Amplitude |
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The size or magnitude of a signal.
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| Analogue-to-Digital (A/D) Converter |
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Converts an analogue signal (such as a voltage signal from a temperature sensor) into a digital signal suitable for input to a computer.
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| Annealing |
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Process of heating and maintaining a substance at a suitable temperature and then cooling. Used in softening metallic materials. For thermocouple cables done under inert gasses to protect the sheath from oxidation
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| ANSI |
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American National Standards Institute.
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| Ansi Std Mc96.1 |
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Defines The Limits Of Error For Different Types Of Thermocouples, often used where end to end calibartion of a coil of cable is essential - for example in the aerospace industry
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| ASTM |
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An abbreviation for American Society for Testing and Materials.
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| AWG |
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An abbreviation for American Wire Gauge, a coding for standard wire sizes
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