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A thermocouple is a temperature measuring device consisting of two conductors of dissimilar metals or alloys that are connected only at the ends. When the ends are at different temperatures a small voltage is produced in the wire that can be related directly to the temperature difference between the ends. If the temperature at one end is known, the temperature at the other end can be determined.
Calibration Type| Thermocouple Type | ANSI Color Code | Initial Calibration Tolerances | ||||
| Wire Alloys | Calibration | +/- Conductor | Overall | Temperature Range | Standard. Limits | Special Limits |
| Iron(+) vs. Constantan 1 TM(-) | J | White/Red | Brown | 0°C to + 285°C 285°C to +750°C | ±2.2°C ±.75% | 1.1°C ±4% |
| Chromel TM(+) vs. Alumerl TM(-) | K | Yellow / red | Brown | -20°C to + 110°C -110°C to 0°C +285°C to +1250°C | ±2% ±2.2°%C ±2.2°C to ±.75% | ±1.1°C% ±.4% |
| Copper(+) vs. Constantan TM .(-) | T | Blue/Red | Brown | -200°C to -65°C -65°C to +130°C 130°C to +230°C | ±1.5°C ±1°C ±.75% | ±.8°C ±.5% ±.4% |
| Chromel(+) vs. Constantan TM .(-) | E | Purple/Red | Brown | -200°C to -170°C -170°C to +250°C 250°C to +340°C 340°C to +900°C | ±1°C ±1.7°C ±1.7% ±.5% | ±1°C ±1°C% ±.4% ±.4% |
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