(Reference Junction at 0°C)
American Limits of Error ASTM E230-ANSI MC 96.1
| ANSI Code | Standard Limits | Special Limits | |||
|---|---|---|---|---|---|
| J | Temp Range Tolerance Value |
>0 to 1250°C 2.2°C or 0.75% -200 to 0°C 2.2°C or 2.0% |
>32 to 2282°F 4.0°F or 0.75% -328 to 32°F 4.0°F or 2.0% |
0 to 1250°C 1.1°C or 0.4% |
32 to 2282°F 2.0°F or 0.4% |
| K | Temp Range Tolerance Value |
>0 to 750°C 2.2°C or 0.75% |
>32 to 1382°F 4.0°F or 0.75% |
0 to 750°C 1.1°C or 0.4% |
32 to 1382°F 2.0°F or 0.4% |
| T | Temp Range Tolerance Value Temp. Range* Tolerance Value |
>0 to 350°C 1.0°C or 0.75% -200 to 0°C 1.0°C or 1.5% |
>32 to 662°F 1.8°F or 0.75% -328 to 32°F 1.8°F or 1.5% |
0 to 350°C 0.5°C or 0.4% |
32 to 662°F 1°F or 0.4% |
| E | Temp Range Tolerance Value Temp. Range* Tolerance Value |
>0 to 900°C 1.7°C or 0.5% -200 to 0°C 1.7°C or 1.0% |
>32 to 1652 3°F or 0.5% -328 to 32°F 3°F or 1.0% |
0 to 900°C 1.0°C or 0.4% |
32 to 1652°F 1.8°F or 0.4% |
| N | Temp Range Tolerance Value Temp. Range* Tolerance Value |
>0 to 900°C 1.7°C or 0.5% -200 to 0°C 1.7°C or 1.0% |
>32 to 1652 3°F or 0.5% -328 to 32°F 3°F or 1.0% |
0 to 900°C 1.0°C or 0.4% |
32 to 1652°F 1.8°F or 0.4% |
| R S | Temp Range Tolerance Value |
0 to 1450°C 1.5°C or 0.25% |
32 to 2642°F 2.7°F or 0.25% |
0 to 1450°C 0.6°C or 0.1% |
32 to 2642°F 1°F or 0.1% |
| B | Temp Range Tolerance Value |
800 to 1700°C 0.5% |
1472 to 3092°F 0.9°F |
Not Established | |
| G* C* D* | Temp Range Tolerance Value |
0 to 2320°C 4.5°C or 1.0% |
32 to 4208°F 0.9°F |
Not Established | |
* Not official symbol or standard designation † Whichever value is greater.
Note: Material is normally selected to meet tolerances above 0°C. If thermocouples are needed to meet tolerances below 0°C, the purchaser shall state this as selection of material is usually required.
IEC Tolerance Class EN 60584-2; JIS C 1602
| IEC Code | Class 1 | Class 2 | Class 3† | |
|---|---|---|---|---|
| J | Temp Range Tolerance Value Temp Range Tolerance Value |
-40 to 375°C ±1.5°C 375 to 750°C ±0.4% Reading |
-40 to 333°C ±2.5°C 333 to 750°C ±0.75% Reading |
Not Established |
| K N | Temp Range Tolerance Value Temp Range Tolerance Value |
-40 to 375°C ±1.5°C 375 to 1000°C ±0.4% |
-40 to 333°C ±2.5°C 333 to 1200°C ±0.75% Reading |
-167 to 40°C ±2.5°C -200 to -167°C ±1.5% Reading |
| T | Temp Range Tolerance Value Temp Range Tolerance Value |
-40 to 125°C ±0.5°C 125 to 350°C ±0.4% Reading |
-40 to 133°C ±1°C 133 to 350°C ±0.75% Reading |
-67 to 40°C ±1°C -200 to -67°C ±1.5% Reading |
| E | Temp Range Tolerance Value Temp Range Tolerance Value |
-40 to 375°C ±1.5°C 375 to 800°C ±0.4% Reading |
40 to 333°C ±2.5°C 333 to 900°C ±0.75% Reading |
-167 to 40°C ±2.5°C -200 to -167°C ±1.5% Reading |
| R S | Temp Range Tolerance Value Temp Range Tolerance Value |
0 to 1100°C ±1°C 1100 to 1600°C ±[1 + 0.3% x (Rdg-1100)]°C |
0 to 600°C | -167 to 40°C ±2.5°C -200 to -167°C ±1.5% Reading |
| B | Temp Range Tolerance Value Temp Range Tolerance Value |
Not Established | 600 to 1700°C ±0.25% Reading |
600 to 800°C +4°C 800 to 1700°C 0.5% Reading |
† Material is normally selected to meet tolerances above -40°C. If thermocouples are needed to meet limits of Class 3, as well as those of Class 1 or 2, the purchaser shall state this, as selection of material is usually required.