Extension wires connect thermocouples to measurement instruments while maintaining temperature signal accuracy.
Extension wires are specialized conductors used to extend the distance between thermocouple sensors and temperature measurement or control instruments without introducing significant measurement errors. They are designed to match the thermoelectric properties of specific thermocouple types (such as Type K, J, T, E, etc.) over a limited temperature range, typically from -40°C to 200°C. These wires consist of paired conductors with specific alloy compositions that create a predictable and stable electromotive force (EMF) when subjected to temperature gradients, ensuring the temperature signal transmitted from the thermocouple junction remains accurate over extended cable runs.
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Extension wires are used to connect thermocouples to instruments over distances and are rated for lower temperature ranges (typically up to 200°C). Thermocouple wires are used to make the actual sensing junction and are rated for the full temperature range of the thermocouple type (up to 1200°C for Type K). Using extension wires beyond their temperature rating causes measurement errors.
No. Ordinary copper wire does not match the thermoelectric properties of thermocouple alloys. Using it introduces significant measurement errors because it creates additional thermoelectric junctions with different Seebeck coefficients, resulting in inaccurate temperature readings.
Select based on: 1) Thermocouple type (K, J, T, etc.), 2) Required temperature range, 3) Environmental conditions (moisture, chemicals, abrasion), 4) Electrical noise in the environment (choose shielded versions if needed), and 5) Compliance with industry standards for your application.
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