| Gadolinia |
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A neutron absorbing powder used in nuclear power stations for moderation of the reaction. Used by Tyco Thermal Controls in the manufacture of assemblies for nuclear power stations.
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| Gap measurement |
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A term for our capacitive measuring system for high temperature measurement of gaps in turbines & other rotating equipment
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| GDCD16 |
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A now obsolete standard originally defined by the UK's monolithic power generator, the CEGB in the 1960's. Often superceeded by individual cable standards per power station
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| Grounded Junction |
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Thermocouple construction where wires are attached to the inside of the probe wall at the hot junction, resulting in a quick response time.
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Harness
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A mineral insulated cable assembly used where flexible and low temperature cables would be no good - often at high temperature & vibration
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| Hastelloy |
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A high temperature alloy used in some limited applications for thermocouple sheaths
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| Head box |
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A connection box
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| Heat Treating |
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A Method Of Thermal Strain Relief used for reliving stresses of manufacture of thermocouple cable.
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| Heavy wall |
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A Thermocouple cable with 20% wall thickness supplied by Tyco Thermal Controls
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| Hi-Pot Test |
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A test that determines the largest potential that can be applied to a conductor without breaking down the insulation (see Dielectric Strength).
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| Hot IR |
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A test for the insulation resistance of an MI cable, conducted at raised temperature - often 500 Celcius
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| Ice Point |
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An Obsolete Term In Thermometry. The Temperature Of A Mixture Of Melting Ice And Water At Normal Atmosphere Pressure, Defined As 32 Degree F (Zero Deg C). Replaced In Ipts-68 (And Its-90) By Triple Point Of Water To Which The Temperature Of 0.01 C Degree Is Assigned.
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| Inconel |
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A trade name for a high nickel alloy from Special Metals
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Insulation Resistance
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The ability of an MI cable to resist breakdown / short circuit at high applied voltages. Will be low if moisture has been allowed into the cable through sheath punctures or poor end sealing
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| Interchangeability |
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How closely sensors compare to their manufacturing specs and to each other.
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Interchangeability Error
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A Measurement Error That Occurs When Two Or More Sensors Are Used To Make The Same Measurement.
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| Intrinsically Safe |
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A Circuit In Which Any Spark Or Thermal Effect Produced Normally Or In Specified Fault Condition Is Incapable Of Causing Ignition Of A Specified Gas Or Vapor, In Air In Its Most Easily Ignited Concentration. Per Test Conditions In Nfpa Standard 493-1975.
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| IPTS- 68, 48 |
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Abbreviations for the International Practical Temperature Scales of 1968 and 1948. IPTS-68 is the most recent revision of the temperature scale, which is a standard scale made up of fixed points that closely approximate thermodynamic temperatures. All temperatures between the fixed points are derived by interpolation using the assigned interpolation instrument.
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| Iron |
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The positive leg of a type J thermocouple.
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| IS0 9000 / 9002 |
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A key quality standard
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| ISA |
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An abbreviation for the Instrument Society of America.
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| Isolation |
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Two circuits are isolated when there is no direct electrical connection between them.
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