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CableMaster provides a complete product line of thermocouple wire for applications requiring precise temperature measurement such as boilers, furnaces, ovens, heat treating, pharmaceuticals, chemicals and petrochemicals, HVAC, automotive, food processing, appliances, sensors, and more.

CableMaster can quickly provide custom manufactured thermocouple wire designed to meet the most demanding design specifications and applications.

A thermocouple is a junction between two different metals that produces a voltage related to a temperature difference. Thermocouples are a widely used type of temperature sensor for measurement and control and can also be used to convert heat into electric power.

Thermocouple wire is available in several different metallurgical formulations per type, typically, in decreasing levels of accuracy and cost: special limits of error, standard, and extension grades.

Extension Wire

Extension grade wires made of the same metals, as a higher-grade thermocouple, are used to connect it to a measuring instrument some distance away, without introducing additional junctions between dissimilar materials that would generate unwanted voltages.


K Type Thermocouple

Type K (chromel-alumel) is the most common general purpose thermocouple. It is inexpensive and works in the -200C to +1350C range. One of the constituent metals, nickel, is magnetic; a characteristic of thermocouples made with magnetic material that undergo a step change in output when the magnetic material reaches its Curie point (appx 354C for type K thermocouples)

E Type Thermocouple

Type E (chromel – constantan) has a high output that makes it well suited to cryogenic use. Additionally, it is non-magnetic.

J Type Thermocouple

Type J (iron-constantan) has a more restricted range than type K (-40C to +750C). The Curie point of the iron (770C) causes an abrupt change in the characteristic that determines the upper temperature limit. Type J, like Type K, contains a magnetic metal iron.

Type R/S Thermocouple

Type R thermocouples use a platinum-rhodium alloy containing 13% rhodium for one conductor and pure platinum for the other conductor. Type R thermocouples are used up to 1600C, and type S is used as the standard of calibration for the melting point of gold (1064.43C) CableMaster currently only provides extension grade Type R thermocouples consisting of a positive (+) Copper leg and a negative(-) Copper Alloy (Alloy 11) leg.

Type T Thermocouple

Type T copper-constantan thermocouples are suited for measurements in the -200C to 350C range. They are often used as a differential measurement since only copper wire touches the probes. Both conductors are non-magnetic, and accordingly, there is no Curie point and not abrupt change in characteristics.

Each type of thermocouple cable listed above is available with different types of insulation and jacketing materials depending on the application of use. There is additional over braids that may be added to provide additional insulation from heat. These cables can also be customized in multi conductor and multi-pair configurations with and without shields.

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