Accurate And Stable Type T Thermocouple Wire Positive Leg Cu(TP) For Scientific Research And Humidity Resistance

Accurate And Stable Type T Thermocouple Wire Positive Leg Cu(TP) For Scientific Research And Humidity Resistance

Type T thermocouple wire consists of Copper (Cu, TP) as the positive leg and Constantan (Cu-Ni alloy, TN) as the negative leg. It is widely used for low-temperature measurements, offering high accuracy and stability.  The Type T thermocouple's positive leg, composed of pure copper (Cu(TP)), is a critical component in cryogenic and low-temperature measurement systems. As one of the most stable thermoelectric materials, Cu(TP) offers a linear output voltage of approximately 43 μV/°C over its operational range of -200°C to 350°C (some specialized grades up to 400°C). The high purity copper (≥99.95%) ensures excellent thermal conductivity and minimal resistance variation, making it ideal for precise temperature sensing in environments like refrigeration systems, food processing, and medical devices.

Composition & Properties:

• Positive Leg (TP): Pure Copper (~99.9%)
• Temperature Range: -200°C to 350°C
• Accuracy: ±1.0°C or 0.75% (Standard), ±0.5°C or 0.4% (Special)
• Electrical Conductivity: High (similar to pure copper)
• Corrosion Resistance: Good in dry air but prone to oxidation in humid environments
• EMF Output: ~40.69 µV/°C at 0-100°

Thermocouple temperature range and tolerance

Key Features of Type T Positive Leg (Cu, TP):

• Material Composition: 99.9% pure copper
• Temperature Range: -200°C to 370°C (-328°F to 698°F)
• Electrical Conductivity: High, as it is made of pure copper
• Corrosion Resistance: Good resistance to oxidation in moist environments
• Thermoelectric Stability: Excellent for cryogenic and laboratory applications
• Accuracy: ±0.5°C or better in standard limits of error (IEC 60584, ASTM E230)
• Compatibility: Works with the Constantan (Cu-Ni) negative leg (TN)
• Color Code:

ANSI/IEC: Blue outer jacket, Copper-colored positive lead

Applications

• Cryogenics & Refrigeration (low-temperature monitoring)
• Biomedical & Laboratory Equipment
• Food Processing & Cold Storage
• Environmental Monitoring Systems

Key Advantages:

• High Precision: Stable output at cryogenic temperatures
• Good Conductivity: Fast response time
• Cost-Effective: Compared to noble metal thermocouples
• Non-Magnetic: Suitable for sensitive environments

Limitations:

• Limited High-Temperature Use – Oxidation risk above 350°C
• Copper Susceptibility – Requires proper insulation to prevent interference

Type T thermocouple with Cu (TP) positive leg is ideal for precise low-temperature measurement applications, ensuring reliable performance in demanding environments.

• 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.