Calibrations - Thermocouple Wire
The principle behind thermocouple wire is that the joining of two alloys exposed to certain temperature will create a specific voltage. A different temperature will produce a different voltage. Essentually temperature can be measured using thermocouple wire and equipment that can translate the voltage reading into a corresponding temperature. Those two alloys are the wire's Calibration.
Calibrations fall into three categories.
- Themocouple Special Limits of Error
- Thermocouple Wire
- Thermocouple Extension
Thermocouple and Extension Wire - Calibration Tolerances
| Calibration Type |
Temperature Range | Tolerances (whichever is greater) | ||
|---|---|---|---|---|
| °F | °C | Standard | Special | |
| Thermocouple-Grade Wire | ||||
| J | 32 to 1382°F | 0 to 750°C | ±2.2°C or ±0.75% | ±1.1°C or ±0.4% |
| K | 32 to 2282°F | 0 to 1250°C | ±2.2°C or ±0.75% | ±1.1°C or ±0.4% |
| E | 32 to 1652°F | 0 to 900°C | ±1.7°C or ±0.5% | ±1.0°C or ±0.4% |
| T | 32 to 662°F | 0 to 350°C | ±1.0°C or ±0.75% | ±0.5°C or ±0.4% |
| R or S | 32 to 2642°F | 0 to 1450°C | ±1.5°C or ±0.25% | ±0.6°C or ±0.1% |
| B | 1598 to 3092°F | 870 to 1700°C | ±0.5°C | |
| N | 32 to 2282°F | 0 to 1250°C | ±2.2°C or ±0.75% | ±1.1°C or ±0.4% |
| Extension-Grade Wire | ||||
| JX | 32 to 392°F | 0 to 200°C | ±2.2°C | ±1.1°C |
| KX | 32 to 392°F | 0 to 200°C | ±2.2°C | ±1.1°C |
| EX | 32 to 392°F | 0 to 200°C | ±1.7°C | ±1.0°C |
| TX | 32 to 212°F | 0 to 100°C | ±1.0°C | ±0.5°C |
| NX | 32 to 392°F | 0 to 200°C | ±2.2°C | ±1.1°C |
| Compensating Extension Wire | ||||
| BX | 32 to 392°F | 0 to 200°C | ±3.7°C | |
| CX | 32 to 1600°F | 0 to 870°C | ±6.8°C | |
| RX or SX | 32 to 392°F | 0 to 200°C | ±5.0°C | |
