| ISA CODE | Conductor & Characteristics | Temperature Range | Limits of Error | |||
|---|---|---|---|---|---|---|
| Positive | Negative | Fahrenheit | Celsius | Standard | Special | |
| J | Iron
(Magnetic) |
Constantan
(Non-Magnetic) |
32° to 1382° | 0° to 750° | 2.2°C (4°F) or 0.75% | 1.1°C (2°F) or .4% |
| Jx | Iron (White) |
Constantan
(Red) |
32° to 392° | 0° to 750° | 2.2°C (4°F) or 0.75% | 1.1°C (2°F) or 0.4% |
| T |
Copper
(Yellow Metal) |
Constantan
(Silver Metal) |
-328°to 32° 32° to 662° |
-200° to 0° *
0° to 350° |
1°C (1.8°F) or 1.5%
1°C (1.8°F) or 0.75% |
**
0.5°C or (0.9°F) or 0.4% |
| Tx |
Copper
(Blue) |
Constantan
(Red) |
-76° to +212° | -60° to + 100° | 1°C (1.8°F) | 0.5°C (0.9°F) |
| K |
Chromel
(Non-Magnetic) |
Alumel
(Magnetic) |
32° to 2282° | 0° to 1250° |
2.2°C (4°F) or 0.75% |
1.1°C (2°F)
or 0.4% |
| Kx |
Chromel
(Yellow) |
Alumel
(Red) |
32° to 392° | 0° to 200° | 2.2°C(4°F) | --- |
| E | Chromel | Constantan | 32° to 1652° | 0° to 900° | 1.7°C (3°F) or 0.5% | 1°C(1.8°F) or 0.4% |
| Ex |
Chromel
(Purple) |
Constantan
(Red) |
32° to 392° | 0° to 200° | 1.7°C(3°F) | --- |
| S |
Platinum
10% Rhodium |
Platinum | 32° to 2642° | 0° to 1450° | 1.5°C(2.7°F) or 0.25% | 0.6°C(1.1°F) or 0.1% |
| R |
Platinum
13% Rhodium |
Platinum | 32° to 2642° | 0° to 1450° | 1.5°C(2.7°F) or 0.25% | 0.6°C(1.1°F) or 0.1% |
| Sx |
Copper
(Black) |
11 Alloy
(Red) |
32° to 392° | 0° to 200° | 0.57mV | --- |
| B |
Platinum
30% Rhodium |
Platinum
6% Rhodium |
1472° to 3092° | 800° to 1700° | 0.5% | .25% |
| Bx |
Copper
(black) |
Copper
(White) |
32° to 212° | 0° to 100° | 0,000mV | ---- |
| W | Tungsten |
Tungsten
26% Rhenuium |
32° to 800°
800° to 4200° |
0° to 472°
472° to 2315° |
4.5°C(8°F) 1% *** |
--- |
| W3 |
Tungsten
3% Rhenium |
Tungsten
25% Rhenium |
32° to 800°
800° to 4200° |
0° to 472°
472° to 2315° |
4.5°C(8°F) 1% *** |
--- |
| W5 |
Tungsten
5% Rhenium |
Tungsten
26% Rhenium |
32° to 800°
800° to 4200° |
0° to 472°
472° to 2315° |
4.5°C(8°F) 1% *** |
--- |
* Thermocouples and thermocouple materials are normally supplied to meet the limits of error specified in the table for temperatures above 0°C. The same materials, however, may not fall within the sub-zero limits of error given in this section. If materials are required to meet the sub-zero limits, the purchase order must so state. Selection of materials usually will be required.
** Little information is available to justify establishing special limits of error for sub-zero temperatures.
*** For wire sizes of .010″ dia. and larger.
NOTES:
Note 1: Values for J, T, K, E, R, S and B are the same as those specified in ANSI specification MC96.1-1982
Note 2: Where error is given in percent, the percentage applies to the temperature being measured, not the range. Select whichever is greater
Note: Limits of Error for Type N are the same as Type K
Note: Type W5 is also known as Type C