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Wire Color Codes and Limits of Error
ANSI Code | Alloy Combination |
| Maximum Useful Temperature Range ++ | Maximum Thermocouple Grade Temperature Range | EMF (mV) Over Max. Temperature Range | Standard Limits of Error** (above O°C) | Special Limits of Error** (above O°C) | International IEC 584-3 | Comments Environment — Bare Wire | IEC Code | ||||
+ Lead | - Lead | Thermocouple Grade | Extension Grade | |||||||||||
J | IRON Fe (magnetic) | CONSTANTAN COPPER-NICKEL Cu-Ni | Thermocouple Grade: 32 to 1382°F 0 to 750°C Extension Grade: 32 to 392°F 0 to 200°C | –346 to 2193°F –210 to 1200°C | –8.095 to 69.553 | greater of 2.2°C or 0.75% | greater of 1.1°C or 0.4% | Reducing, Vacuum, Inert. Limited Use in Oxidizing at High Temperatures. Not Recommended for Low Temperatures. | J | |||||
K | CHROMEGA® NICKELCHROMIUM Ni-Cr | ALOMEGA® NICKEL-ALUMINUM Ni-AI (magnetic) | Thermocouple Grade: –328 to 2282°F –200 to 1250°C Extension Grade: 32 to 392°F 0 to 200°C | –454 to 2501°F –270 to 1372°C | –6.458 to 54.886 | greater of 2.2°C or 0.75% | greater of 1.1°C or 0.4% | Clean Oxidizing and Inert. Limited Use in Vacuum or Reducing. Wide Temperature Range, Most Popular Calibration | K | |||||
T | COPPER Cu | CONSTANTAN COPPER-NICKEL Cu–Ni | Thermocouple Grade: –328 to 662°F –250 to 350°C Extension Grade: –76 to 212°F –60 to 100°C | –454 to 752°F –270 to 400°C | –6.258 to 20.872 | greater of 1.0°C or 0.75% | greater of 0.5°C or 0.4% | Mild Oxidizing, Reducing Vacuum or Inert. Good Where Moisture Is Present. Low Temperature and Cryogenic Applications | T | |||||
E | CHROMEGA® NICKELCHROMIUM Ni-Cr | CONSTANTAN COPPER-NICKEL Cu-Ni | Thermocouple Grade: –328 to 1652°F –200 to 900°C Extension Grade: 32 to 392°F 0 to 200°C | –454 to 1832°F –270 to 1000°C | –9.835 to 76.373 | greater of 1.7°C or 0.5% | greater of 1.0°C or 0.4% | Oxidizing or Inert. Limited Use in Vacuum or Reducing. Highest EMF Change Per Degree | E | |||||
N | OMEGA-P® NICROSIL Ni-Cr-Si | OMEGA-N® NISIL Ni-Si-Mg | Thermocouple Grade: –450 to 2372°F –270 to 1300°C Extension Grade: 32 to 392°F 0 to 200°C | –450 to 2372°F –270 to 1300°C | –4.345 to 47.513 | greater of 2.2°C or 0.75% | greater of 1.1°C or 0.4% | Alternative to Type K. More Stable at High Temps | N | |||||
R | PLATINUM- 13% RHODIUM Pt-13% Rh | PLATINUM Pt | NONE ESTABLISHED | Thermocouple Grade: 32 to 2642°F 0 to 1450°C Extension Grade: 32 to 300°F 0 to 150°C | –58 to 3214°F –50 to 1768°C | –0.226 to 21.101 | greater of 1.5°C or 0.25% | greater of 0.6°C or 0.1% | Oxidizing or Inert. Do Not Insert in Metal Tubes. Beware of Contamination. High Temperature | R | ||||
S | PLATINUM- 10% RHODIUM Pt-10% Rh | PLATINUM Pt | NONE ESTABLISHED | Thermocouple Grade: 32 to 2642°F 0 to 1400°C Extension Grade: 32 to 300°F 0 to 150°C | –58 to 3214°F –50 to 1768°C | –0.236 to 18.693 | greater of 1.5°C or 0.25% | greater of 0.6°C or 0.1% | Oxidizing or Inert. Do Not Insert in Metal Tubes. Beware of Contamination. High Temperature | S | ||||
U | COPPER Cu | COPPER-LOW NICKEL Cu-Ni | NONE ESTABLISHED | Extension Grade: 32 to 122°F 0 to 50°C | Extension Grade Connecting Wire for R and S Thermocouples, Also Known as RX and SX Extension Wire. | U | ||||||||
B | PLATINUM- 30% RHODIUM Pt-30% Rh | PLATINUM- 6% RHODIUM Pt-6% Rh | NONE ESTABLISHED | Thermocouple Grade: 32 to 3092°F 0 to 1700°C Extension Grade: 32 to 212°F 0 to 100°C | 32 to 3308°F 0 to 1820°C | 0 to 13.820 | 0.5% over 800°C | NOT ESTABLISHED | Oxidizing or Inert. Do Not Insert in Metal Tubes. Beware of Contamination. High Temperature. Common Use in Glass Industry | B | ||||
G* (W) | TUNGSTEN W | TUNGSTEN- 26% RHENIUM W-26% Re | NONE ESTABLISHED | Thermocouple Grade: 32 to 4208°F 0 to 2320°C Extension Grade: 32 to 500°F 0 to 260°C | 32 to 4208°F 0 to 2320°C | 0 to 38.564 | greater of 4.5°C or 1.0% | NOT ESTABLISHED | Vacuum, Inert, Hydrogen. Beware of Embrittlement. Not Practical Below 399°C (750°F). Not for Oxidizing Atmosphere | G (W) | ||||
C* (W5) | TUNGSTEN- 5% RHENIUM W-5% Re | TUNGSTEN- 26% RHENIUM W-26% Re | NONE ESTABLISHED | Thermocouple Grade: 32 to 4208°F 0 to 2320°C Extension Grade: 32 to 1600°F 0 to 870°C | 32 to 4208°F 0 to 2320°C | 0 to 37.066 | greater of 4.5°C or 1.0% | NOT ESTABLISHED | Vacuum, Inert, Hydrogen. Beware of Embrittlement. Not Practical Below 399°C (750°F) Not for Oxidizing Atmosphere | C (W5) | ||||
D* (W3) | TUNGSTEN- 3% RHENIUM W-3% Re | TUNGSTEN- 25% RHENIUM W-25% Re | NONE ESTABLISHED | Thermocouple Grade: 32 to 4208°F 0 to 2320°C Extension Grade: 32 to 500°F 0 to 260°C | 32 to 4208°F 0 to 2320°C | 0 to 39.506 | greater of 4.5°C or 1.0% | NOT ESTABLISHED | Vacuum, Inert, Hydrogen. Beware of Embrittlement. Not Practical Below 399°C (750°F)–Not for Oxidizing Atmosphere | D (W3) |
++ Except as further restricted by temperature limits for T/C diameter and insulation tables that follow.
* Not official symbol or standard designation.
** For controlled initial accuracy below 0°C, ask OMEGA's sales Department for a CAL-4 calibration report.