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Below is a chart of the thermocouple codes/conductor combinations per different countries and their characteristics. Countries listed in this chart include: United States of America, United Kingdom, Germany, Japan, and France.
Thermocouple codes in this chart include: K, V, T, J, E, N, R, S, B, U, W, W5, and W3.
ANSI: American National Standard Institute: ANSI MC 96.1: Temperature measurement thermocouples: BS: British Standard Institution: BS 4937l: International thermocouple reference tables: BS 5308: Standard for instrumentation cables: BS 5839-1: Fire detection and alarm system for building. Code of practice: BS 6387. High quality ANSI MC 96.1 Type K Thermocouple Cable 2xAWG16 With Silicone Rubber Jacket from China, China's leading k type thermocouple cable product, with strict quality control thermocouple bare wire factories, producing high quality thermocouple bare wire products. Oct 29, 2018 Standards have long been crucial for the use and management of thermocouples in both science and industry. Most users of thermocouples may be familiar with ANSI MC96.1, which gave tables detailing calibration types, thermocouple tolerances, and some other information. ANSI MC96.1 PDF ANSI MC Temperature Measurement Thermocouples Establishes uniformity in the designation of thermocouples and extension wires and provides. ISA–MC–, Temperature Measurement Thermocouples. Constitute an endorsement of the thermocouple type by ISA, ANSI, and NBS.
Code | Conductor Combinations | Approximate Generated EMF Change per Degree F change with Reference Junction at 0°F µV / °F at... | Approximate Working Temperature Range of Measuring Junction °F | National Standards for Output of Thermocouple Conductors (Those standards noted in this column all conform with each other and are based upon IPTS 1968 & IEC 584.1:1977.) | American | English to BS1843 | German to DIN 43714 | Japanese | French to NR C 42-323 | Notes | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
+ leg | - leg | 212°F | 932°F | 1832°F | Continuous | Short Term | ||||||||
K | Nickel-Chromium Also known as: Chromel, Ni-Cr, T1 | Nickel-Aluminum Also known as: Ni-Al, Alumel, KN, T2 | 23.33 | 23.89 | 21.67 | 32 to +2012 | -292 to +2462 | ANSI/MC96.1 Type 'K' | Wide range and most commonly used. ANSI/MC96.1 Type 'K' replaced circular 561. | |||||
V | Copper | Copper-Nickel Also known as: Constantan, Nickel | Used for interconnecting Type 'K' thermocouples and instrumentation as an alternative to Type 'K' material. Only used where the interconnection temperature is in the range of 32°F to +176°F | Color coded for use as a compensating cable for Type 'K' thermocouples. This compensating cable can also be used for extending Type 'T' thermocouples. | ||||||||||
T | Copper | Copper-Nickel Also known as: Nickel, Cupron, Constantan | 25.55 | -301 to +572 | -328 to +662 | ANSI/MC96.1 Type 'T' | Many low temperature and cryogenic applications. Suitable for use in a mildly oxidizing or reducing atmosphere as an unprotected thermocouple sensor. ANSI/MC96.1 Type 'T' thermocouple replaced circular 561. | |||||||
J | Iron (magnetic) Also known as: FE | Copper-Nickel Also known as: Constantan, Cupron | 25.55 | 31.11 | 32.78 | +68 to +1292 | -292 to +1382 | ANSI/MC96.1 Type 'J' | Commonly used in the plastic molding industry. Used in reducing atmospheres as an unprotected thermocouple sensor. NB Iron rusts at low and oxidizes at high temps. ANSI/MC96.1 Type 'J' replaced circular 561. | |||||
E | Nickel-Chromium Also known as: Chromel, Chromium Nickel | Copper-Nickel Also known as: Nickel Copper, Constantan | 37.78 | 45.00 | 32 to +1472 | ANSI/MC96.1 Type 'E' | Highest thermal EMF output change/°F. Suitable for use in a vacuum or mildly oxidizing or reducing atmosphere as an unprotected sensor. ANSI/MC96.1 Type 'E' replaced circular 561. | |||||||
N | Nickel-Chromium Silicon Also known as: Nicrosil | Nickel-Silicon-Magnesium Also known as: Nisil | 16.67 | 21.11 | 21.67 | 32 to +2012 | -450 to +2372 | This combination shows good promise as an alternative to Type 'K'. Appears to be more stable and longer-lived. | ||||||
R | Platinum- 13% Rhodium | Platinum | 4.45 | 5.56 | 7.23 | 32 to +1600 | -58 to +3092 | ANSI/MC96.1 Type 'R' | Used for high temp applications. Has high resistance to oxidation and corrosion. Easily contaminated and normally requires protection. ANSI/MC96.1 Type 'R' replaced circular 561. | |||||
S | Platinum- 10% Rhodium | Platinum | 4.45 | 5.00 | 6.11 | 32 to +2822 | -58 to +3092 | ANSI/MC96.1 Type 'S' | See Type 'R'. ANSI/MC96.1 Type 'S' replaced circular 561. | |||||
B | Platinum- 30% Rhodium | Platinum- 6% Rhodium | 0.56 | 2.78 | 5.00 | +212 to +2912 | +122 to +3182 | ANSI/MC96.1 Type 'B' | See Type 'R'. Commonly used in glass industry. Copper vs copper compensating cable can be used to normal ambient interconnection temps up to 100°C. ANSI/MC96.1 Type 'B' replaced circular 561. | |||||
U | Copper | Copper-Low Value Nickel Also known as: Nickel | Used for interconnecting Type 'R' and 'S' thermocouples and instrumentation. Only used where the interconnection temperature is in the range of 32°F to +122°F. | This is a compensating cable only and is used with Types 'R' and 'S' measuring thermocouple sensors. | ||||||||||
W | Tungsten | Tungsten- 26% Rhenium | 2.78 | 8.89 | 11.67 | +68 to +4172 | 32 to +4712 | Tungsten Rhenium alloy combinations offer reasonably high and relatively linear EMF outputs for high temp measurement up to 4712°F and good chemical stability at high temps in hydrogen, inert gas, and vacuum atmospheres. They are not really practicable for use below 752°F. Not recommended for use in oxidizing conditions. Suggested compensating cables are listed below. | ||||||
W5 | Tungsten- 5% Rhenium | Tungsten- 26% Rhenium | 8.34 | 10.00 | 10.00 | +68 to +4172 | 32 to +4712 | |||||||
W3 | Tungsten- 3% Rhenium | Tungsten- 25% Rhenium | 7.23 | 11.11 | 11.11 | +68 to +3632 | 32 to +3812 | |||||||
Thermocouple Combinations | Compensating Cable | Combination |
+ leg | - leg | |
W | ALLOY 200 | ALLOY 226 |
W5 | ALLOY 405 | ALLOY 426 |
W3 | ALLOY 203 | ALLOY 225 |
Written by Shelby Reece
Date Published: 12.10.2018
Last Updated: 03.12.2020
ANSI MC Temperature Measurement Thermocouples Establishes uniformity in the designation of thermocouples and extension wires and provides, . ISA–MC–, Temperature Measurement Thermocouples . constitute an endorsement of the thermocouple type by ISA, ANSI, and NBS. The letter. Thermocouples measure temperature with two metals and an emf. They were calibrated with ANSI MC but now depend on NIST and.
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