Types and structure of thermocouples
Types and structure of thermocouples? In the case of
Thermocouples are one of the most commonly used temperature sensing components in industry. Its advantages are:
① high precision measurement. Due to the thermocouple directly with the measured object contact, from the middle of the medium.
② wide range of measurement. Common thermocouple from -50 ~ +600 ℃ can be measured side by side, some special thermocouple can be measured at -269 ℃ (such as gold and iron nickel chrome), up to +2800 ℃ (such as tungsten - rhenium).
③ simple structure, easy to use. Thermocouples are usually composed of two different wires, and are not limited by the size and the beginning, the outer protective sleeve, with very convenient to use.
1. Thermocouple temperature basic principle of two different materials of the conductor or semiconductor A and B welded together to form a closed loop. When there is a temperature difference between the two dedicated points 1 and 2 of conductors A and B, an electromotive force is generated between the two, and thus a large current is formed in the circuit, which is called the thermal effect of the thermal zirconia probe. Thermocouple is the use of this effect to work.
2. Types and structure of thermocouples
Types of thermocouples Thermocouples can be divided into standard thermocouple and non-standard thermocouple two categories. Called standard thermocouple is the national standard specifies the relationship between its thermoelectric power and temperature, allowing the error, and a unified standard thermocouple, it has a matching display instrument available.
