Thermocouple Cable
Thermocouple wires & cables are used to make or extend signals from a thermocouple. Thermocouple wire is used in a thermocouple from the sensing point to the cold junction compensation point (or reference point).
It is the difference in the millivolt output from the sensing point to the reference point that provides the temperature measurement. Different thermocouple types require different alloy wire combinations.
Some of the more popular thermocouple wire & cable types include
• Type E (Chromel/Constantan),
• Type J (Iron/Constantan),
• Type K (Chromel/Alumel), and
• Type T (Copper/Constantan)
LIMITS OF ERROR :-
• Initial Calibration Tolerances as per ASTM E230 & ANSI MC 96.1
• Tolerance – Reference Junction ( 0°C)
• Limits of Error in Thermocouple Wire
Limits of Error in Thermocouple Wire
| Type of Wire | Temperature Range | Standard Grade |
|---|---|---|
| T | (-200°C to 370°C ) | ±1.8 (1) or ±0.75% |
| J | (0°C to 760°C) | ±4 (2.2) or ±0.75% |
| E | (-200°C to 870°C) | ±3.1 (1.7) or ±0.50% |
| K | (-200°C to 1260°C) | ±4 (2.2) or ±0.75% |
| N | (-200°C to1260°C) | ±4 (2.2) or ±0.75% |