Type T Thermocouple - Technical Information
Type T - Copper vs Copper-Nickel, IEC 60584-1
Thermocouple Type T, whose original name was Copper-Constantan, has found quite a niche for itself in laboratory temperature measurement over the range -250°C to 400°C - although above this the copper arm rapidly oxidises. Repeatability is excellent in the range -200°C to 200°C (±0.1°C). Points to watch out for include the high thermal conductivity of the copper arm, and the fact that the copper/nickel alloy used in the negative arm is not the same as that in Type J - so they’re not interchangeable.
Type T Thermocouples - Typical Constructions and Styles
Type T Mineral InsulatedThermocouples
Rugged sensors, ideal for most applications. Vast choice of terminations e.g. pot seals, cables, connectors, heads etc.Type T Swaged TipThermocouples
Fast response thermocouples ideal for industrial and other applications.
Type T MiniatureThermocouples
Ideal for precision temperature measurements where minimal displacement and a fast response is required.
Type T Heavy DutyThermocouples
For industrial applications such as furnaces, kilns, ovens, boliers, flues etc. Many types of sheath material available.
General PurposeType T Thermocouples
A wide range of thermocouples to suit many applications. Hand held, surface, bayonet, bolt, patch styles etc.
ATEX/IECEx ApprovedType T Thermocouples
A large range of thermocouples with a variety of terminations such as pot seal, terminal heads etc.
Type T - Technical Data
| Conductor Combination | Approximate generated EMF change in µV per ºC change (referenced to 0ºC) at: |
Approximate Working Temperature Range |
Thermocouple Output Tolerances to IEC 60584-1 | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
| + Leg | - Leg | 100ºC | 500ºC | 1000ºC | Continuous | Short Term | Type | Class 1 | Class 2 | Class 3 |
| COPPER |
COPPER - NICKEL Also known as: Constantan, Advance™, Cupron™ |
46 | – | – | –185 to +300°C | –250 to +400°C | Temperature Range Tolerance Value Temperature Range Tolerance Value |
–40°C to +125°C ±0.5°C 125°C to 350°C ±0.004⋅ |t| |
–40°C to +133°C ±1.0°C 133°C to 350°C ±0.0075 ⋅ |t| |
–67°C to +40°C ±1.0°C –200°C to –67°C ±0.015⋅ |t| |
1. The tolerance is expressed either as a deviation in degrees Celsius or as a function of the actual temperature.
2. Thermocouple materials are normally supplied to meet the tolerances specified in the table for temperatures above –40 deg C. These materials however, may not fall within the tolerances for low temperatures given under Class 3 for Types T, E and K thermocouples. If thermocouples are required to meet limits of Class 3, as well as those of Class 1 and/or Class 2, the purchaser should state this, as selection of materials is usually required.
3. The maximum temperature rating is dependant upon construction, size and atmospheric conditions. A more detailed guide for the maximum temperature ratings of mineral insulated thermocouples can be found here.
2. Thermocouple materials are normally supplied to meet the tolerances specified in the table for temperatures above –40 deg C. These materials however, may not fall within the tolerances for low temperatures given under Class 3 for Types T, E and K thermocouples. If thermocouples are required to meet limits of Class 3, as well as those of Class 1 and/or Class 2, the purchaser should state this, as selection of materials is usually required.
3. The maximum temperature rating is dependant upon construction, size and atmospheric conditions. A more detailed guide for the maximum temperature ratings of mineral insulated thermocouples can be found here.
Cable Colour Codes for T Type Thermocouples
| International Colour Code to IEC 60584-3 | ANSI MC96.1 | Redundant national colour coding for thermocouple cables | ||
|---|---|---|---|---|
| BS 1843 | DIN 43714 | NFC 42324 | ||
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