The advantages and disadvantages of using thermocouple temperature sensor

A, the advantages of using thermocouple

1, wide temperature range: from low temperature to the jet engine exhaust, thermocouple is applicable to most of the actual temperature range. Thermocouple measuring temperature range in & ndash; 200° C - 2500 & deg; C, depending on the use of wire.

2, strong and durable: thermocouple is durable device, good resistance to shock vibration, harsh environment suitable for danger.

3, fast response, because of their small size, low heat capacity, thermocouple fast response to temperature changes, especially in the induction juncture when naked. They can be in the hundreds of milliseconds to respond to temperature changes.

4, no spontaneous heat: due to the thermocouple don't need to motivate power, therefore not easy spontaneous heat, its itself is safe.

2, the disadvantage of using thermocouple

1, the signal disposal complicated: converting the thermocouple voltage available temperature readings required a large amount of signal disposal. For a long time, signal disposal cost a lot of time to design, improper handling can introduce error, lead to lower precision.

2, low precision, in addition to internal thermocouple due to metal features inherent accuracy, thermocouple measuring accuracy can reach the accuracy of measurement of the reference junction temperature, typically in 1 & deg; C to 2 & deg; C.

3, susceptibility to corrosion, because of the thermocouple is made up of two dissimilar metals, under some conditions, corrosion may reduce accuracy over time. As a result, they may need protection; And the essential maintenance.

4, noise resistance poor: when measuring millivolt level signal changes, stray electric field and magnetic field generated by noise may cause problems.