| O.D. |
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Outside Diameter: The Outside Diameter Of The Sheath Of An Rtd Or Thermocouple (Vs Id Or Inside Dia Of Pipe).
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| Ofhc |
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Oxygen Free High Conductivity Copper: One Leg On A Type T Thermocouple. The Other Leg Being An Alloy Of 60/40 Copper/Nickel.
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| Output |
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Often used interchangeably with EMF as a term for the property being measured in the electronics connecte to thermocouples
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| Output Impedance |
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The Resistance As Measured On The Output Terminals Of A Sensor Or Transducer.
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Parallel thermocouple
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A duplex thermocouple wire construction where two conductors are laid parallel and the other pair are laid the ame. Distinct from diagonal where the pairs are opposite each other - generally only relevant to the connection of the wires.
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| Platinum |
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The negative leg in types R and S thermocouples. A noble metal, symbol Pt with excellent chemical and heat resistance. It is more ductile than silver, gold, or copper.
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| Platinum 10% Rhodium |
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The platinum-rhodium alloy that forms the positive leg on a type S thermocouple.
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| Platinum 13% Rhodium |
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The platinum-rhodium alloy that forms the positive leg on a type R thermocouple.
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| Platinum 30% Rhodium |
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The platinum-rhodium alloy that forms the positive leg on a type B thermocouple.
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| Platinum 6% Rhodium |
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The platinum-rhodium alloy that forms the negative leg on type B thermocouple.
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| Platinum 67 |
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The platinum standard used by the NIST. Platinum 67 is used to interpolate the temperature scale between 630.74 and 1064.43°C. Previously called Platinum 27, Platinum 67 (IPTS-68) is 9 microvolts negative to Platinum 27 (IPTS-48) at 1200°C.
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| Positive Temperature Coefficient |
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An Increase In Resistance With An Increase In Temperature. An RTD Characteristic.
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| Pot seal |
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At the junction between the MI cable & the flexible cable, a pot seal is used to strengthen the bond between the core rods and the flexible cables & is filled with a compount to provide mechnical support to that. The seal is also providing resistance to moisture ingress
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Potting compound
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Sealant used in a pot seal to provide mechanical support & moisture resistance for MI cables
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| Primary Standard |
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A term that applies to an instrument that meets conditions required for establishing the International Practical Temperature Scale.
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| Probe |
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A Generic Term For Any Temperature Sensor.
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| Protection Head |
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The Lead Exit End Of A Sensor Where The Connections Are Made To The Process Instruments. Also Known As The Connection Head. Made Of Iron, Aluminium Or Plastic.
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| Protection Tube |
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A Closed End Metal Or Ceramic Tube Into Which A Temperature Sensor Is Inserted For Protection Against The Medium In Which It Is Operated. Also Known As "Thermowell"
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| PTFE |
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An abbreviation for polytetrafluoroethylene. One of the most chemically resistant carbon based insulations.
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| PVC |
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An abbreviation for polyvinyl chloride, a thermoplastic with excellent dielectric strength and flexibility.
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| Pyrosil |
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Tyco Thermal Controls development of the original high Nickel alloy Nicrobel. Excellent for providing low drift, high strength and low corrosion at temperatures to 2300F, 1250C
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Reference Junction
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The junction in a thermocouple circuit that is maintained at a constant, known temperature. It is also referred to as the cold junction and as a standard it is usually maintained at 0°C; however, any temperature can be used.
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Refractory Metal Thermocouple
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A thermocouple made from materials that melt above 1935°C./ 3600F
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Repeatability
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The ability of a sensor or system to indicate the same reading under repeated identical conditions.
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Response Time
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Time required by a sensor to reach 63.2% of a step change in temperature under a specified set of conditions.
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| Rhenium |
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An elementary metal that when added to tungsten, forms an alloy with better ductility and improved high temperature strength over tungsten alone.
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| Rhodium |
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A platinum group metal added to alloy pure platinum to increase high-temperature strength.
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| RTD |
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An abbreviation for resistance temperature detector. It is a circuit element whose resistance increases with increasing temperature in a predictable manner. Platinum is the most popular material used in RTD's.
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| RTD bulb |
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A deviced used to monitor changes of resistance with temperature - often a small coilof platinum inserted into a ceramic bead and encapsulated
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| RTD cable |
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Cable used to connect platinum (or copper or nickel) resistance devices to the measuring instrument
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