High Temperature Furnace Thermocouple

How A Thermocouple Works

SentroTech furnace thermocouples are electrical temperature sensors used to gauge a wide range of temperature changes in high temperature laboratory furnaces.

Two different electrical conductors form electrical junctions to produce a voltage at a single junction. This causes a thermoelectric effect to interpret varying measurements of temperatures.

For commercial and industrial applications, Sentro Tech offers the following high temperature furnace thermocouples:

• Type K Thermocouple
• Type S Thermocouple
• Type R Thermocouple
• Type B Thermocouple

Type K Thermocouple

Most commonly used, the Type K furnace thermocouple measures temperatures from -300°F to +2460°F. This magnetic thermocouple is typically made of nickel and changes its output when the material reaches its Curie point at around 365°F. The Type K thermocouple for high temperature furnaces functions very well in oxidizing atmospheres, except when exposed to hydrogen (which can cause green rot).

Type S Thermocouple

High-temperature applications that reach up to around 2900°F use the Type S furnace thermocouple. Lower temperature processes also use Type S thermocouples because of its accuracy and stability. Like all platinum-type thermocouples, always use a ceramic tube to protect the Type S thermocouple.

Type R Thermocouple

Like the Type S, the Type R furnace thermocouple is used in high-temperature applications reaching up to 2900°F. However, never use the Type R in reducing atmospheres. As an all platinum-type, a ceramic tube should always protect Type R thermocouples.

Type B Thermocouple

Temperature applications of up to around 3200°F use the Type B furnace thermocouple. Use this platinum-type of thermocouple in oxidizing or inert atmospheres with applications ranging from 1000°F to 3100°F. Never use Type B thermocouples in reducing atmospheres. Always use a ceramic tube to protect this type of thermocouple.