R Type Thermocouple

A type R thermocouple, also known as a thermocouple type R, operates using the Seebeck effect, a principle discovered by Thomas Johann Seebeck in 1821 that explains how an electromotive force (EMF) or voltage is generated when two dissimilar metals joined together experience a temperature difference. In this setup, two different metal wires are connected at one end to form the hot or measurement junction, while the opposite ends are linked to a measuring device. Each thermocouple type is engineered based on the metals used, giving it unique temperature capabilities. When the hot junction of a type R thermocouple differs in temperature from the cold (reference) junction, a small voltage is produced that directly reflects the temperature difference. This millivolt-level voltage is then measured with precise instruments and converted into temperature using reference tables or formulas specific to the thermocouple type, ensuring accurate and reliable readings.

A Type R thermocouple is one of the many types of thermocouples used for temperature measurement. Thermocouples are temperature sensors that generate a voltage proportional to the temperature difference between two junctions. In the case of Type R thermocouples, they are made from a combination of platinum (Pt) and rhodium (Rh) metals.

Specifically, a Type R thermocouple is composed of a positive leg (PtRh10%) and a negative leg (Pt), where PtRh10% refers to platinum alloyed with 10% rhodium. This thermocouple type is designed for high-temperature applications and is commonly used in industries such as metallurgy, ceramics, and other processes where accurate and stable temperature measurements at elevated temperatures are required.

Type R thermocouples have a temperature range of approximately 0 to 1600 degrees Celsius (32 to 2912 degrees Fahrenheit). They are known for their high accuracy and stability at high temperatures, making them suitable for demanding industrial environments.

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