| Secondary Standard |
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A measurement device that has been referenced to a primary standard.
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| Seebeck Coefficient |
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Rate of change of thermal EMF with temperature at a set temperature, expressed in millivolts per degree.
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| Seebeck Effect |
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States That The Junction Of Two Dissimilar Metals Held At Different Temperatures Will Product A Current Flow Proportional To The Temperature Difference.
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| Seebeck emf |
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The net thermal emf in a thermocouple under zero current conditions.
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Sensor
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Temperature measurement device, most commonly an RTD or Thermocouple.
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| Sheath |
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The external metal covering that protects the highly compacted powder insulant and the core rods form corrosion or mechanical damage. Main types are Steels, Alloy 600 and others suitable for high temperatures - such as Pyrosil
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| Si |
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System International, The New International Systems Of Measuring Units. Replaced The Old Metric System.
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| Signal cable |
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Another name for RTD or extension cable
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| Simplex |
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1 thermocouple, 2 core rods, 1 pair - a single thermocouple with 2 dissimilar metals.
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| Special |
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Term used to describe thermocouple cables of best emf output quality - ie closest to theoretical accuracy for that cable.
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| Stability |
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The ability of an instrument or a sensor to maintain a consistent output with the application of a constant input.
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| Strain Gauge |
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A device which experiences a change in resistance when it is stretched or strained.
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| SX / RX Compensating Cable |
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Often it is necessary to arrange the cold junction at some distance from the hot junction for reasons of design, finance or safety. In other cases, the measuring circuit is installed permanently and the actual thermocouple is designed as a measuring insert so that it can easily be replaced. It is then necessary to have a connection cable between the thermocouple and the cold junction with the same thermoelectric properties as the thermocouple itself. This connection is the compensating or extension cable
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Teflon®
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Trademark of Dupont Company. Insulation composed of flurocarbon polymer used on RTD or Thermocouple leadwires.
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| Temperature Calibration Point |
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A temperature at which the output of a sensor is compared or determined by comparison against a standard.
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| Thermocouple |
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A Junction Of Two Dissimilar Metals With Millivolt Output Proportional To The Difference In Temperature Between The Hot Junction And The Cold Junction
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Thermocouple cable
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Mineral Insulated, Flexible or Ceramic beads provide insulation between 2 dissimilar metals to create a thermocouple cable.
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| Thermowell |
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A closed-end tube that will accept a temperature sensor and provide a pressure-tight connection at the well's point of installation.
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| Tip Clearance |
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Tyco Thermal Controls range of high temperature capacitive sensors for measuring small distances in rotating equipment
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| Transducer cable |
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Another name for signal or RTD cable - similar core rods inside a sheath.
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| Transient |
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A short surge of current or voltage, often occurring before steady-state conditions have become established.
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| Transmitter |
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Device which is externally powered and transmits a signal from a sensor via a two wire current loop.
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| Triple Point of Water |
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A thermodynamic state (of water) in which the gas, liquid, and solid phases all occur in equilibrium. For water, the triple point is 0.01°C.
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| Triplex |
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3 thermocouples in one sheath - ie 6 core rods or 3 pairs. Occasionally used to provide single cable, multiple measuring point thermocouples.
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| T-Type Thermocouple |
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Copper-constantan thermocouple with a temperature range of -200 to 400°C
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| Twisted Pair |
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Two insulated conductors twisted together. Twisted wires in flexible thermocouple circuits minimize magnetic noise produced from current carrying conductors. MI metal sheathed thermocouples are shielded by the meatla outer sheathing.
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