Cu-CuNi Type T Constantan Thermocouple Wire for Accurate Temperature Measurements in Laboratories

Cu-CuNi Type T Constantan Thermocouple Wire is a temperature sensing element made of copper (Cu) for the positive leg and a Copper-Nickel (CuNi) alloy, also known as Constantan, for the negative leg. Type T thermocouples are well-regarded for their high accuracy, low-temperature sensitivity, and resistance to corrosion, particularly in low-temperature and humid environments.

Cu-CuNi Type T Constantan Thermocouple Wire is a high-precision, low-temperature thermocouple that offers excellent accuracy, sensitivity, and stability. It is especially useful for cryogenic measurements, scientific research, and applications where humidity resistance is required. The combination of copper and copper-nickel alloy allows it to excel in environments prone to oxidation and corrosion, though its temperature range is limited to low-to-moderate temperatures. Type T thermocouples are well-suited for industries and research areas that require precise low-temperature measurements, such as medical, food, and environmental testing.

Color codes of thermocouple ( T type )

Thermocouple temperature range and tolerance

Key Features of Cu-CuNi Type T Thermocouple Wire:

• Temperature Range

-200°C to 350°C (-328°F to 662°F).

Ideal for low-temperature applications, such as cryogenic temperatures and laboratory settings.

• High Sensitivity

Type T thermocouples provide excellent accuracy with a thermoelectric voltage of approximately 50 µV/°C at 0°C.

Offers high sensitivity, particularly at low temperatures, making it ideal for precise measurements in cryogenic applications.

• Material Composition

Positive Leg (Cu): Pure copper is highly conductive, ensuring rapid and accurate response to temperature changes.

Negative Leg (CuNi/Constantan): Copper-Nickel alloy (usually 55% copper and 45% nickel) provides excellent stability and resistance to corrosion and oxidation, especially in humid environments.

• Corrosion and Oxidation Resistance

Copper Leg: Copper has good resistance to oxidation at low and moderate temperatures but is susceptible to oxidation at higher temperatures.

Constantan Leg: The Copper-Nickel alloy (Constantan) is highly resistant to oxidation and corrosion, particularly in humid or moist environments, making Type T a good choice for high-humidity applications.

• Electrical Properties

Excellent thermoelectric properties that allow for highly accurate temperature measurements, especially in the low-temperature range.

Low temperature drift, ensuring long-term stability and reliability in measurements.

• Magnetic Properties

Type T thermocouples are non-magnetic, making them suitable for sensitive applications where magnetic fields must be avoided.

Applications

• Cryogenics: Commonly used in low-temperature measurements (cryogenic applications) because of their high sensitivity and low drift at temperatures as low as -200°C.
• Scientific Research: Used in laboratories where precise temperature control is required for experiments.
• HVAC & Environmental Testing: Ideal for temperature measurements in humid environments and environmental testing.
• Medical: Suitable for monitoring body temperature in medical devices.
• Food Processing: Used in refrigeration and food storage facilities where low-temperature measurements are needed.​

Cable Options

• Available in bare wire, insulated wire, or cable configurations, with various insulation materials such as fiberglass, Teflon, and ceramic.
• Can be shielded or unshielded depending on the application, particularly in environments with electrical interference.

Advantages of Type T Thermocouple Wire:

• Accuracy at Low Temperatures: Type T is one of the most accurate thermocouples in the low-temperature range.
• Non-Magnetic: This feature makes it ideal for sensitive applications, such as medical equipment or precision instruments.
• Corrosion and Oxidation Resistance: Excellent performance in humid and moisture-rich environments due to the corrosion resistance of the Constantan leg.
• Stable Performance: Offers low drift and good long-term stability, making it reliable for applications that require consistent results.

Limitations:

• Limited High-Temperature Range: Type T is not suitable for high-temperature environments (above 350°C), limiting its use in industrial applications that require higher temperatures.
• Oxidation of Copper Leg: The copper leg can oxidize at higher temperatures, reducing the lifespan of the thermocouple if exposed to high-temperature or oxidizing environments.
• More Expensive Than Other Thermocouples: Due to its high sensitivity and specialized use, Type T can be more expensive compared to other common thermocouples like Type K.