Thermocouple Types

Use the table below to determine which thermocouple type is best for your application. Standard IEC color coding is shown below, as well.

A thermocouple consists of a welded “hot” junction between two dissimilar metals – usually wires – and a reference junction at the opposite end. The metal alloys in the positive and negative leg wires define the type of thermocouple. The proper thermocouple type for your application depends on your temperature expectations, and on the environment in which your sensor will be placed.

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+/- AlloysComments
K32 to2300℉ Nickel-Chromium (Chromel)
Nickel-Aluminum (Alumel)
For continuous oxidizing or neutral atmospheres
Used mostly above 1000℉
J32 to 1400℉ Iron
Copper-Nickel (Constantan)
For vacuum, reducing, or inert atmospheres
For oxidizing atmospheres with reduced life
T-328 to 700 ℉ Copper
Copper-Nickel (Constantan)
For vacuum, oxidizing, reducing, or inert atmospheres
Will not easily corrode in moist atmospheres
E32 to 1600℉ Nickel-Chromium (Chromel)
Copper-Nickel (Constantan)
For continuously oxidizing or inert atmospheres
Very high thermoelectric output
N32 to 2300℉ Nicrosil (a nickel alloy)
Nisil (a nickel alloy)
Used wherever Type K elements have a shorter life
and stability problems due to oxidation or “green rot”
R1000 to 2700℉ Platinum-Rhodium
For very high temperatures
Used in industry
S1000 to 2700℉ Platinum-Rhodium
For very high temperatures
Used in laboratories
B1600 to 3100℉ Platinum-Rhodium
For very high temperatures in industry and labs
Lower output, but less grain growth and drift
Type K
Type J
Type T
Type E
Type N
Type R
Type S
Type B

Looking for thermocouples by application? See our Thermocouples page.

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Antech Sales, Inc.
105 Elwood Avenue
Medina NY 14103