Choose thermocouples according to different temperature and environmental requirements.
Choose thermocouples according to different temperature and environmental requirements.
In the actual temperature measurement, the side object is extremely complex, should be familiar with the measured object, master the various thermocouple characteristics, based on the measurement requirements, the use of the environment, the level of temperature and so choose the correct thermocouple.
A Press the temperature selection
When t <1000 ℃, the choice of cheap metal thermocouple, such as K-type thermocouple. It is characterized by the use of a wide temperature range, high temperature performance is more stable. When t = -200 a 300 ℃, the best choice of T-type thermocouple, which is the highest accuracy of cheap metal thermocouple; can also choose E-type thermocouple, it is the highest potential in the thermoelectric power change, the sensitivity Highest. When t = 1000 a 1400 ℃, the choice of R, S-type thermocouple. When t <1300 ℃, the choice of N-type or K-type thermocouple. When t = 1400 a 1800 ℃, the choice of B-type thermocouple. When t <1600 ℃, short-term use S-type or R-type thermocouple. When t> 1800 ℃, often use tungsten zinc thermocouple.
B according to the selected medium selection
a: oxidizing atmosphere
When t <1300 ℃, multi-use N-type or K-type thermocouple, because they are the strongest corrosion resistance of the metal thermocouple; when t> 1300 ℃, the choice of platinum basking thermocouple.
b: vacuum, reducing atmosphere
When t <950 ℃, you can choose J-type thermocouple, it can work in the oxidizing atmosphere. Can also work in a reducing atmosphere; when t> 1600 ℃, should use tungsten rhenium thermocouple.
