The reliability and fast response of thermocouples have become the first choice in various environments!

The reliability and fast response of thermocouples have become the first choice in various environments!

As is well known, thermocouples are the most commonly used temperature sensors and can be widely used in various temperature control fields of industrial production. Compared with resistance temperature detectors, thermal regulators, and temperature detection integrated circuits (ICs), thermocouple sensors have a wider temperature range and higher cost-effectiveness.

In addition, the robustness, reliability, and fast response time of thermocouples make them the preferred choice in various working environments. Of course, there are also some defects in thermocouple temperature measurement, such as poor linearity. Although they can measure a wider temperature range than resistive temperature detectors and temperature sensor ICs, their linearity is greatly reduced. In addition, RTDs and temperature sensor ICs have high sensitivity and accuracy, making them ideal choices for precision temperature measurement systems. The thermocouple signal level is very low and often requires amplification or high-resolution data converters for processing. If the above problems can be eliminated, thermocouples are widely used due to their low cost, convenient use, and wide temperature range.

Explosion proof thermocouples usually use flammable and explosive chemical gases in production sites!

Armored thermocouples have a small outer diameter, flexible bending, and strong seismic performance. Prefabricated thermocouples cannot be installed. The outer protective tube adopts stainless steel pipes of different materials (suitable for different working temperatures), filled with insulating high-density oxide materials, which is very suitable for installation in harsh environments.

Explosion proof thermocouple production sites usually use various flammable and explosive chemical gases. If it is easy to use thermocouples caused by gas explosions in normal environments, fire-resistant thermocouples must be used. The explosion-proof thermocouples produced by our factory are used in hazardous areas for the use of explosive gases.

Thermocouple wires generally exhibit heterogeneity after use!

Industry insiders know that the unevenness of thermocouple wires is generated after use. For the new type of thermocouple, even if the uneven thermoelectric electromotive force can meet the requirements, the thermocouple will lose uniformity due to repeated processing and bending. In addition, if the thermocouple is in a high-temperature state for a long time during use, the deterioration of the thermocouple wire can cause changes in the thermoelectric electromotive force

For example, thermocouples inserted into industrial furnaces will deteriorate along the length direction of the thermocouple wire, and the degree of degradation will also increase with the increase of temperature. When the degraded part is located at the temperature gradient, parasitic electromotive force will be generated and added to the total thermoelectric electromotive force, causing measurement errors. In practice, it has been found that some thermocouple products (mostly cheap metal thermocouples) that have been certified as qualified by the metrology department are unqualified during on-site use. Subsequently, he returned to the metrology department, mainly due to uneven distribution of even threads. The technical personnel producing thermocouples have realized that the failure rate of thermocouples increases with the length of the thermocouple. They are all caused by the non-uniformity of the heating wire. In summary, the error caused by parasitic electromotive force depends on the unevenness of the thermocouple wire itself and the temperature gradient.

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