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Beaded Thermocouples
An “oldie but goodie” Beaded Thermocouples were among the first thermocouple construction types to become accepted in industry. Today, they are still commonly used for extremely high temperature applications and assembled with ceramic protection tubes where standard and even most exotic metal tube or sheath materials would simply not survive. They are also used as a rugged, cost effective solution for metal protection tube applications where the application calls for more frequent replacement.
Beaded thermocouples are an excellent choice where NIST traceable certified calibrations can be supplied to AMS 2750 standards based on individual or lot calibrations.
- Thermocouple Type Material & Color Code
- Thermocouple Limits of Error and Published Range For Bare Wire
- Thermocouple Sheath Material Temperature Limits
- Thermocouple Temperature Limits By Sheath Diameter
| Thermocouple Type | Material | Magnetic | ASTM Color Coding | IEC Color Coding |
| J | Iron Constantan | Yes No |
White Red |
White Black |
| T | Copper Constantan | No No |
Blue Red |
White Brown |
| K | Chromel Alumel | No No |
Yellow Red |
White Green |
| E | Chromel/Constantan | No No |
Purple Red |
White Violet |
| P | Platinel | N/A | N/A | N/A |
| S | Platinum 10% Rhodium Pure Platinum | No No |
Black Red |
White Orange |
| R | Platinum 13% Rhodium Pure Platinum | No No |
Black Red |
white Orange |
| B | Platinum 30% Rhodium Platinum 6% Rhodium | No No |
Grey Red |
White Grey |
| N | Nicrosil/Nisil | No Slightly |
Orange Red |
White Pink |
| C | Tungsten 5% Rhenium/ Tungsten 26% Rhenium | No No |
White Red |
N/A |
| ANSI Thermocouple Type | Temp Range (°C) | Temp Range (°F) | Standard Limits of Error (°C)* | Special Limits of Error (°C) |
|---|---|---|---|---|
| J | 0 to 760 | 32 to 1400 | The greater of ±2.2 or ±0.75% | The greater of ±2.2 or ±0.75% |
| T | 0 to 370 | 32 to 700 | The greater of ±1 or ±0.75% | The greater of ±0.5 or ±0.4% |
| K | 0 to 1260 | 32 to 2300 | The greater of ±2.2 or ±0.75% | The greater of ±1.1 or ±0.4% |
| E | 0 to 870 | 32 to 1600 | The greater of ±1.7 or ±0.5% | The greater of ±1 or ±0.4% |
| S | 0 to 1480 | 32 to 2700 | The greater of ±1.5 or ±0.25% | The greater of ±0.6 or ±0.1% |
| R | 0 to 1480 | 32 to 2700 | The greater of ±1.5 or ±0.25% | The greater of ±0.6 or ±0.1% |
| N | 0 to 1246 | 32 to 2300 | The greater of ±2.2 or ±0.75% | The greater of ±1.1 or ±0.4% |
| B | 870 to 1700 | 1600 to 3100 | ±0.5% | ±0.25% |
| TA | -200 to 0 | -328 to 32 | The greater of ±1 or ±1.5% | B |
| EA | -200 to 0 | -328 to 32 | The greater of ±1.7 or ±1% | B |
| KA | -200 to 0 | -328 to 32 | The greater of ±2.2 or ±2% | B |
A: Thermocouple and thermocouple materials are normally supplied to meet the tolerances specified in the table of temperatures above 0°C. The same materials, however, may not fall within the tolerances given for temperatures below 0°C in the normal section in the table. If materials are required to meet the tolerances stated for temperatures below 0°C the purchase order must specifically state that requirement. Selection of materials will usually be required.
B: Special tolerances for temperatures below 0°C are difficult to justify due to limited available information.
*: Standard and special limits of error in °F are 1.8 times larger thant the °C tolerance at the equivalent °C temperature.
| Material Symbol |
Sheath Material |
Melting Point(°F) |
Max Temp; In Air(°F) |
Atmosphere* |
|---|---|---|---|---|
| H | 304 SS | 2550 | 1650 | ORNV |
| J | 310 SS | 2550 | 2100 | ORNV |
| L | 316L SS | 2550 | 1650 | ORNV |
| O | 446 SS | 2700 | 2100 | ORNV |
| M | Inconel 600 | 2500 | 2100 | ONV |
| P | Inconel 702 | 2620 | 1500 | ONV |
| Q | Platinum | 3216 | 3000 | ON |
| R | Molybdenum | 4750 | 1000 | VNR |
| T | Titanium | 3300 | 600 | V |
| V | STABALOY | 2552 | 2220 | ORNV |
*KEY
O=Oxidizing, R=Reducing, N=Neutral, V=Vacuum
| Suggested Upper Limit for Outside Diameter (Single Element) °C (°F) | ||||||
|---|---|---|---|---|---|---|
| Sheath | Thermocouple Type | |||||
| In | mm | T | J | E | K | N |
| 1/25" | 1.0 | 260° (500°) | 260° (500°) | 300° (570°) | 700° (1290°) | 2700° (1290°) |
| 1/16" | 1.6 | 260° (500°) | 440° (825°) | 510° (950°) | 920° (1690°) | 920° (1690°) |
| 1/8" | 3.2 | 315° (600°) | 520° (970°) | 650° (1200°) | 1070° (1950°) | 1070° (1950°) |
| 3/16" | 4.8 | 370° (700°) | 620° (1150°) | 730° (1350°) | 1150° (2100°) | 1150° (2100°) |
| 1/4" | 6.3 | 370° (700°) | 720° (1330°) | 820° (1510°) | 1150° (2100°) | 1150° (2100°) |
| 3/8" | 9.5 | 370° (700°) | 720° (1330°) | 820° (1510°) | 1150° (2100°) | 1150° (2100°) |
Resources
JMS Southeast, Inc.