Optimizing Performance with Cu-CuNi (Type T) Thermocouple Alloys
Product Overview
The Cu-CuNi thermocouple, commonly known as Type T, is a highly reliable temperature sensor consisting of a pure Copper positive leg (TP) and a Constantan negative leg (TN). With its chemical composition of Cu 55% and Ni 45% in the negative leg, this thermocouple delivers exceptional accuracy in low-temperature applications. Fully compliant with IEC 60584-1 standards, Type T thermocouples offer superior performance in their designated temperature range.
Key Advantages
Excellent Low-Temperature Performance: Optimized for temperature measurement from -200°C to 350°C with high accuracy and stability
Oxidation-Resistant Design: Superior performance in oxidizing environments compared to other base-metal thermocouples
Material Precision: Strict composition control ensures consistent thermoelectric properties
Standardized Compatibility: Full compliance with international standards guarantees reliable performance
Type and Chemical Composition (%)
Type | Designation | Ni | Cu | Mn | Si | Al |
Positive Leg | Cu (TP) | / | 100 | / | / | / |
Negative Leg | Constantan (TN) | 45 | 55 | / | / | / |
Performance Characteristics
EMF Output vs. Pt-64 (mV)
Precisely calibrated thermal EMF output ensures measurement accuracy across the operating range.
Type | 100°C | 200°C | 300°C |
Cu TP | 4.229-4.325 | 9.238-9.334 | 14.792-14.932 |
Cu TN | 0.763-0.783 | 1.826-1.846 | 3.137-3.161 |
Cu-CuNi (Combined) | 3.484-3.524 | 7.412-7.488 | 11.655-11.771 |
Physical Properties
Optimized material properties ensure durability and reliable performance in various applications.
Property | Cu (TP) | CuNi (TN) |
Density at 20°C (g/cm³) | 9.0 | 8.9 |
Melting Point (°C) | 1084 | 1220 |
Tensile Strength, Annealed (MPa) | ≥190 | ≥390 |
Elongation, Annealed (%) | ≥20 | ≥25 |
Resistivity at 20°C (μΩ·m) | 0.018 | 0.50 |
Technical Notes
Type T Constantan (TN) provides different EMF characteristics compared to Type J Constantan (JN)
While TN and EN types are interchangeable, they cannot be interchanged with IN type
Operating range limited to 350°C maximum due to copper's oxidation susceptibility
Typical Applications
Low-temperature process monitoring and control
Cryogenic and refrigeration systems
Environmental chambers and thermal testing
Food processing and storage applications
HVAC and building automation systems
Why Choose Type T Thermocouple Alloys?
Proven accuracy in critical low-temperature measurements
Consistent batch-to-batch performance through strict quality control
Excellent mechanical properties for easy installation and handling
International standard compliance for reliable system integration
Conclusion
Type T thermocouples provide optimized solutions for low-temperature measurement applications requiring high accuracy and reliability. Their specific material composition and standardized performance characteristics make them ideal for applications where temperature precision is critical below 350°C. By selecting Type T thermocouples, engineers ensure dependable temperature monitoring with consistent, repeatable results.