Description
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Type E thermocouple bare wire detail:
Positive: Chromel, Negative: Constantan
Color: · bright or oxidized
Product Size: 0.05mm to 10.0mm
Thermocouple bare wire is used at temperatures up to 1260°C (2300°F). MICC thermocouple bare
wire is supplied with bright or oxidized surface according to standard or special EMF requirements.
Each individual lead is calibrated against platinum and the EMF values are shown on each coil or spool.
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| Thermocouple Variety and Index |
| Variety | Type | Measurement Range(℃) |
| NiCr-NiSi | K | –200–1300 |
| NiCr-CuNi | E | –200–900 |
| Fe-CuNi | J | –40–750 |
| Cu-CuNi | T | –200–350 |
| NiCrSi-NiSi | N | –200–1300 |
| NiCr-AuFe0.07 | NiCr-AuFe0.07 | –270–0 |
Thermocouple type and grade
| Thermocouple Type | Grade | Temperature Range(℃) | Allowable Deviation |
| type K and type N | I | –40–1100 | ±1.5℃ or±0.4％t |
| II | –40–1300 | ±2.5℃ or ±0.75％t |
| III | –200–40 | ±2.5℃ or ±1.5％t |
| type E | I | –40–1100 | ±1.5℃ or ±0.4％t |
| II | –40–1300 | ±2.5℃ or ±0.75％t |
| III | –200–40 | ±2.5℃ or±1.5％t |
| type J | I | –40–750 | ±1.5℃ or ±0.4％t |
| II | –40–750 | ±2.5℃ or ±0.75％t |
| type T | I | –40–350 | ±0.5℃ or± 0.4％t |
| II | –40–350 | ±1.0℃ or± 0.75％t |
| III | –200–40 | ±1.0℃ or± 1.5％t |
| NiCr-AuFe0.07 | I | –270–0 | ±0.5℃ |
| II | ±1.0℃ |
Specification of alloy wire
| Anode | Cathode | Diameter(mm) | Maximum Temperature(℃) |
| name | code | name | code | long-time using | short-time using |
| NiCr10(Chromel) | KP | NiSi3(Alumel) | KN | Φ0.3 | 700 | 800 |
| Φ0.5 | 800 | 900 |
| Φ0.8 Φ1.0 | 900 | 1000 |
| Φ1.2 Φ1.6 | 1000 | 1100 |
| Φ2.0 Φ2.5 | 1100 | 1200 |
| NiCr14.2Si | NP | NiSi4 | NN | Φ3.2 | 1200 | 1300 |
| NiCr10(Chromel) | EP | CuNi45(Copel) | EN | Φ0.3 Φ0.5 | 350 | 450 |
| Φ0.8 Φ1.0 Φ1.2 | 450 | 550 |
| Φ1.6 Φ2.0 | 550 | 650 |
| Φ2.5 | 650 | 750 |
| Φ3.2 | 750 | 900 |
| Fe(Iron) | JP | CuNi45(Copel) | JN | Φ0.3 Φ0.5 | 300 | 400 |
| Φ0.8 Φ1.0 Φ1.2 | 400 | 500 |
| Φ1.6 Φ2.0 | 500 | 600 |
| Φ2.5 Φ3.2 | 600 | 750 |
| Cu(Copper) | TP | CuNi45(Copel) | TN | Φ0.2 Φ0.3 | 150 | 200 |
| Φ0.5 Φ0.8 | 200 | 250 |
| Φ1.0 Φ1.2 | 250 | 300 |
| Φ1.6 Φ2.0 | 300 | 350 |
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Type of thermocouple bare wire
| Type | Bare wire | Working Enviroment | Termperature (°C) |
| K | NiCr | Oxidizing | -200 | 1260 |
| NiSi | Inert |
| N | NiCrSi | Oxidizing | -200 | 1260 |
| NiSi | Oxidizing |
| E | NiCr | Oxidizing | -200 | 900 |
| CuNi | Oxidizing |
| J | Fe | Oxidizing | -40 | 750 |
| CuNi | Reducing,inert,vacuum |
| T | Cu | Oxidizing,vacuum | -200 | 350 |
| CuNi | Reducing,inert |
Max temperature of thermocouple bare wire
| Type | Φ3.26mm | Φ1.63mm | Φ1.00mm | Φ0.80mm | Φ0.50mm | Φ0.30mm |
| K | 1050°C | 930°C | 900°C | 860°C | 800°C | 750°C |
| E | 860°C | 800°C | 750°C | 700°C | 660°C | 620°C |
| T | | 400°C | 360°C | 320°C | 280°C | 250°C |
| J | 760°C | 760°C | 720°C | 680°C | 650°C | 600°C |
| N | 1100°C | 1010°C | 960°C | 930°C | 890°C | 840°C |
Standard of thermocouple bare wire
IEC tolerance
| Type | Operating temperature range | Tolerance |
| Long | short | Grade | Temperature | Tolerance |
| K | 1200 | 1300 | I | -40~1100′ | ±1.5℃ or ±0.4%t |
| II | -40~1300′ | ±2.5℃ or ±0.75%t |
| N | 1200 | 1300 | I | -40~1100′ | ±1.5℃ or ±0.4%t |
| II | -40~1300′ | ±2.5℃ or ±0.75%t |
| E | 750 | 900 | I | -40~800′ | ±1.5℃ or ±0.4%t |
| II | -40~900′ | ±2.5℃ or ±0.75%t |
| J | 600 | 750 | I | 0~75 | ±1.5℃ or ±0.4%t |
| II | ±2.5℃ or ±0.75%t |
| T | 300 | 350 | I | -40~350′ | ±0.5℃ or ±0.4%t |
| II | ±1℃ or ±0.75%t |
| III | -200~40′ | ±1℃ or ±1.5%t |
ANSI E-230 tolerance
| Type | Temperature range | limits of error |
| standard | special |
| T | (0 to 133)℃[32 to 270]℉
(133 to 350)℃[270 to 662]℉ | ±1℃[2℉]
±0.75% | ±0.5℃[1℉]
±0.4% |
| J | (0 to 293)℃[32 to 559]℉
(293 to 750)℃[559 to 1382]℉ | ±2.2℃[4℉]
±0.75% | ±1.1℃[2℉]
±0.4% |
| E | (0 to 340)℃[32 to 644]℉
(240 to 900)℃[644 to 1652]℉ | ±1.7℃[3℉]
±0.5% | ±1℃[2℉]
±0.4% |
| K | (0 to 293)℃[32 to 559]℉
(293 to 1250)℃[559 to 2282]℉ | ±2.2℃[4℉]
±0.75% | ±1.1℃[2℉]
±0.4% |
| N | (0 to 293)℃[32 to 559]℉
(293 to 1250)℃[559 to 2282]℉ | ±2.2℃[4℉]
±0.75% | ±1.1℃[2℉]
±0.4% |
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