Check out ( Measurement) Component thermocouple is one of the industry commonly used temperature detecting element, must go together with secondary instrument, its advantage is high accuracy of measurement. Because of thermocouple direct contact with the object being measured, not affected by intermediate medium. Wide measuring range. The commonly used thermocouple from - 50 ~ + 1600 ℃ can be continuous measurement, some special thermocouple low measurable to - 269℃( Such as gold iron nickel chrome) High, up to + 2800 ℃ ( Such as tungsten-rhenium thermocouples) 。 Simple structure, easy to use. Thermocouple is usually composed of two different kinds of metal wire, but is not limited by the size and the beginning of, outside has protective casing, which are very convenient. According to the temperature measurement range and accuracy, the corresponding index number of thermocouple temperature at 1300 ~ 1800 ℃, requirements and high accuracy, generally choose b type thermocouple; Required accuracy is not high, atmosphere and allow tungsten-rhenium thermocouples are available, and higher than 1800 ℃ generally choose tungsten-rhenium thermocouples; Temperature at 1000 ~ 1300 ℃ requires accuracy and higher available s type thermocouple and n type thermocouple; Under 1000 ℃ in general with k type thermocouple and n type thermocouple, below 400 ℃ general use e type thermocouple; Negative temperature under 250 ℃, and usually measured in t thermocouple, t thermocouple during low temperature stability and high precision.