In industry or medical, many processes require the use of a thermostat to perform temperature measurements. THE Thermocouple sensor, robust, usable on large temperature beaches and offering a short response time, is an excellent solution. It works thanks to the electrical voltage generated by the temperature difference between two parts of the probe. There conversion table is a tool for interpreting this tension which is also used for calibrate the measurement probe.
What is a thermocouple table?
A Thermocouple table is an essential tool for using the Thermocouple temperature sensor. The table allows convert an electro-motor force (FEM) to a temperature in degrees Celsius or Fahrenheit. This conversion is done thanks to the Seebeck coefficient, specific to the sensor materials. Indeed, Thermoelectric sensitivity varies from one metal to another. It is often the recorder that directly converses. However, it is useful to understand the functioning of thermocouple To use it effectively.
The thermocouple table is also used to Carry out the sensor calibration. During the calibration, we ensure that the voltage obtained corresponds well to the expected temperature in the table. The operation is repeated for test thermocouple on different temperatures. In case of inaccuracy, a correction coefficient is applied.
How to read a thermocouple conversion board?
THE Thermocouple conversion board can take several forms. It indicates the degrees Celsius or Fahrenheit corresponding to each voltage in Millivolt (MV). When this data is represented in the form of Thermocouples curves, we observe that the relationship is not linear and varies according to the type of thermocouple. To read the table, you must know the Thermocouple type. Some tables detail each degree for a given type, while others compare several types for each ten degrees.
THE Thermocouple type depends on the materials used. There are eight main types. Thermocouples of Type E, J, K, N and T use common metals such as iron, copper or chromel. Types B, R and S are made of noble metals such as platinum, which makes them more expensive. Each material has its own expansion and conductivity characteristics. Types N, S, B and R can measure temperatures up to 1,800 ° C.
How to know the potential difference of a thermocouple?
THE Thermocouple works Thanks to the tension generated between two welds exposed to different temperatures. THE Thermocouple table is based on a voltage measured with a cold welding at 0 ° C. For a precise measurement, apply a cold point compensation method.
A method consists of Maintain cold welding at 0 ° C By plunging it into a moving ice water bath. This reliable technique is however difficult to apply in certain industrial areas. An alternative is to Measure the temperature of the cold point in real time And to carry out a differential calculation to obtain the difference in real potential.
At Thermometre.fr, we offer a wide range of measurement probes adapted to the needs of professionals.
