Cu-CuNi Type T Constantan Thermocouple Wire Essential for Precise Temperature Control in Cold Environments
Cu-CuNi Type T Constantan Thermocouple Wire is a temperature-sensing wire composed of a positive leg of copper (Cu) and a negative leg of Copper-Nickel alloy (CuNi), also known as Constantan. Type T thermocouples are renowned for their high accuracy and excellent stability in low-temperature measurements. They are commonly used for precise temperature measurements in a variety of scientific, industrial, and medical applications. Cu-CuNi Type T Constantan Thermocouple Wire is an excellent choice for precise temperature measurements in low-temperature applications. With high sensitivity, excellent accuracy, and good stability, it is widely used in cryogenic systems, laboratories, food processing, and medical applications. Its non-magnetic nature and corrosion resistance make it reliable and effective, though it is limited by its lower maximum temperature range compared to other thermocouple types.
Color codes of thermocouple ( T type )
Type T thermocouple has good resistance to oxidation, high EMF output, with good temperature accuracy, sensitivity and stability. In the temperature range -200~0 ℃ , it has better property, the year stability is less than ±3μV.
| Name | TP | TN |
| Melting Range(℃) | 1084 | 1220 |
| Density(g/cm³) | 8.9 | 8.8 |
| Resistivity(μΩm20℃) | 1.71 | 49 |
| Resistance-temperture coefficient ×10-4/K(0℃-1200℃) | 43 | 0.5 |
| Tensile strength Rm N/mm² MPa | ≥196 | ≥390 |
| Elongation % | ≥30 | ≥25 |
Thermocouple temperature range and tolerance
Name |
Usag Classification |
Grade | Max. operating temperature(℃) |
emperitre nres) |
Tnlerene |
Standard |
Lang term |
Short term |
Cu-CuNi (Type T)
thermocouple
bright wire | T | l, Ⅱ | 300 | 350 | -40~350 | ±0.5℃ or ±0.4%t ±1℃ or ±0.75%t | GB/T4994 ISO 14125 |
| Ⅲ | -200~40 | ±2.5℃ or ±0.75%t |
Key Features of Cu-CuNi Type T Thermocouple Wire:
Operates effectively in the range of -200°C to 350°C (-328°F to 662°F), making it suitable for low-temperature applications such as cryogenics and laboratory work.
Type T thermocouples provide a high thermoelectric voltage of approximately 50 µV/°C at 0°C, making them highly sensitive and ideal for precise temperature measurements in the low-temperature range.
Positive Leg (Cu): Pure copper, providing excellent conductivity and stable thermoelectric properties at lower temperatures.
Negative Leg (CuNi/Constantan): A copper-nickel alloy, typically consisting of 55% copper and 45% nickel, known for its high resistance to corrosion and stability.
Provides a stable and repeatable thermoelectric voltage, with good linearity over a wide temperature range within its limits.
The Constantan (CuNi) leg is resistant to oxidation, particularly in dry environments and at lower temperatures.
Copper, while stable at lower temperatures, is susceptible to oxidation at higher temperatures, so Type T thermocouples are typically used in conditions where high-temperature oxidation is not a concern.
Type T thermocouples are among the most accurate for low-temperature applications, offering an accuracy of ±0.5°C or ±0.75% of the measured value.
Type T thermocouples are non-magnetic, making them ideal for applications where magnetic fields could interfere with the temperature measurement.
Applications
- Cryogenics: Used in the precise temperature measurement of cryogenic systems, such as liquefied gases and supercooled environments.
- Food & Pharmaceutical Industries: Temperature monitoring in low-temperature storage and refrigerated environments.
- Laboratory Use: Ideal for low-temperature studies, calibration, and controlled temperature experiments.
- HVAC: Suitable for temperature measurement in cooling systems.
- Medical Applications: Used in devices requiring accurate low-temperature sensing, such as thermometers and incubators.
Cable Options
- Available in various forms, including bare wire, insulated wire, and cables, with insulation materials like Teflon, fiberglass, or ceramic to meet environmental and durability requirements.
Advantages of Type T Thermocouple Wire:
- High Accuracy: Excellent for low-temperature measurements with minimal deviation.
- Good Sensitivity: Provides accurate readings in the low-temperature range.
- Corrosion-Resistant: Constantan offers high resistance to corrosion, ensuring long service life in non-oxidizing environments.
- Non-Magnetic: Ideal for applications where magnetism is a concern.
- Stable in Cryogenic Environments: Performs well at cryogenic temperatures, making it suitable for scientific research and low-temperature experiments.
Limitations:
- Limited High-Temperature Range: Type T is not suitable for high-temperature applications, with a maximum limit of 350°C (662°F).
- Copper Oxidation: The copper leg can oxidize at higher temperatures or in oxidizing environments, limiting its use in high-temperature applications.
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