Special Thermocouple Types

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Special Thermocouple Types

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Product Description

Product Overview

Thermocouples are temperature sensors made up of two dissimilar metals which are joined at one end forming a hot junction and the open wire end acting as the cold junction, the hot junction is in contact with the process. When the measuring point i.e. hot junction gets heated there is an EMF produced at the cold junction, due to difference in electron density of the two dissimilar metals and the temperature difference between cold end and hot end. Thermocouple elements are made from metals that have material-specific electro negativities in order to achieve the highest possible thermoelectric voltages. Thermocouples are available in both class 1 and class 2 as per IEC 60584 and some standard and special classes in accordance with ASTME230.

Features

Thermocouples can measure a wide range of temperatures, from cryogenic to very high temperatures.
Thermocouples are simple, robust, and reliable devices that can withstand harsh environments and vibrations.
Thermocouples are inexpensive and easy to install and replace.
Thermocouples have fast response time and can measure dynamic temperature changes.
Thermocouples do not require external power or ampification for their operation.

Factors to consider when selecting the right thermocouple for your application :

The temperature range and accuracy required for your measurement.
The chemical compatibility and durability of the thermocouple wires with the environment where they will be exposed.
The physical size and shape of the thermocouple probe or wire that will fit your installation.
The electrical characteristics and noise immunity of the thermocouple circuit and the other measuring instrument.
The availability and cost of the thermocouple type and accessories.

Technical Parameters

Thermocouple Types	Material + & -	Temperature Range (℃)	Application
E	Chromel & Constantan (Ni-Cr & Cu-Ni)	-200 to 900 ℃	Inert Media, Oxidizing media
J	Iron & Constantan (Fe & Cu-Ni)	0 to 750 ℃	Inert Media, Oxidizing media, Reducing media Vacuum
K	Chromel & Alumel (Ni-Cr & Ni-Al)	-200 to 1250 ℃	Inert media, Oxidizing media
N	Nicrosil & Nisil (Ni-Cr & Ni-Si)	-270 to 1300 ℃	Inert media, Oxidizing media
T	Copper & Constantan (Cu & Cu-Ni)	-200 to 350 ℃	Inert media, Oxidizing media, Reducing media Vacuum
R	87% Platinum/ 13% Rhodium & Platinum (Pt & Pt-Rh)	0 to 1450 ℃	Inert media, Oxidizing media
S	90% Platinum/ 10% Rhodium & Platinum (Pt & Pt-Rh)	0 to1450 ℃	Inert media, Oxidizing media
B	70% Platinum/ 30% Rhodium & 94% Platinum/ 6% Rhodium (Pt-Rh Pt-Rh)	0 to 1700 ℃	Inert media, Oxidizing media
C	95% Tungsten/ 5% Rhenium/ 74% Tungsten/ 26% Rhenium	0 to 2320 ℃	Vacuum inert and reducing
G	Tungsten & 74% Tungsten/ 26% Rhenium	0 to 2320 ℃	Vacuum inert and reducing
D	97% Tungsten 3% Rhenium & 75% Tungsten/ 25% Rhenium	0 to 2320 ℃	Vacuum inert and reducing