The Type and Parameters of Thermal Couple for Electric Furnace
Electric furnaces are widely used in many industries such as steel, non-ferrous metals, petrochemical, food, and pharmaceuticals, providing high temperatures and efficient heat treatment. As an important accessory of the electric furnace, the thermal couple plays an important role in the production process of the electric furnace. It not only serves as an interference signal in the temperature controller, but also can measure the temperature in the furnace and display it on the instrument.
Thermocouples are a set of thermoelectric devices that convert temperature into an electrical potential. This electrical potential can be used to understand the temperature of a medium.
Thermocouples come in many varieties. Every type has its own unique properties, but generally can be used in one of three temperature ranges: low, medium and high.
Low-temperature thermocouples are often used in flame temperature monitoring and low-temperature laboratory burning. They are commonly made of thermocouple grade K (chromel-alumel) and J (iron-constantan), with a range from -190°C to 760°C.
Medium-temperature thermocouples are mainly used for measuring the intermediate temperature of industrial furnaces. The most common type is type R (platinum-rhodium 13% -platinum), which has a temperature range of 0-1600°C.
High-temperature thermocouples are mainly used to measure the temperature of furnace materials exceeding 1600°C. In the steel industry, the type S (platinum-rhodium 30% -platinum) is common, with a temperature range of 0-1800°C.
In addition, there are elements suitable for special temperatures, such as B, X and C elements, which can measure temperatures up to 2300°C. There are also thermocouples made of dissimilar metals.
When selecting a thermocouple for an electric furnace, it is important to consider the temperature range and operating temperature conditions of the furnace. Different thermocouples are suitable for different temperature ranges and have different measurement accuracy.
These are the main points to consider when choosing a thermal couple for use in an electric furnace. First, the temperature range of the furnace should be considered. Based on this, the type of thermocouple suitable for the furnace should be determined, as well as its measurement accuracy, response time and cost. Secondly, the corrosive performance of the thermocouple should be considered, and the environment in which it will be used should be selected accordingly. Finally, the installation requirements and maintenance of the thermal couple should be considered. Then choose the right type of thermocouple, size and structure according to the actual situation.
