Thermocouples / RTD Sensors

 Thermocouple or RTD sensors are commonly used temperature measuring element in temperature measuring instruments. It directly measures the temperature, convert the temperature signal int thermoelectric EMF signal, and convert it into the temperature of the measured medium through electrical instruments. The appearance of various thermocouple is often very different due to needs, but their basic structure is generally the same. They are usually composed of thermal electrodes, insulating sleeve protection tube, junction and other main parts, and are usually used together with display instruments, recording instruments and electronic regulators.

In the process of industrial production, temperature is one of the important parameters that need to be measured and controlled. In temperature measurement, thermocouples are widely used, which have many advantages, such as simple structure, convenient manufacturing, wide measuring range, high accuracy, small inertia, and convenient remote transmission of output signals. In addition, because the thermocouple is a passive sensor, which does not need additional power supply for measurement and is very convenient to use, it is often used to measure the temperature of gas or liquid in the furnace and pipeline and the surface the temperature of solid.

There are two-wires, three-wires, and four-wires for the leads of thermocouples and thermal sensors. The two- wires system has simple wiring and low design costs, but it is rarely used to increase the additional error of the lead resistance. The three-wires system can eliminate the influence of internal lead resistance, and most of them use this method. The four-wires system is generally used for high-precision measurement, and this lead method can not only eliminate the resistance of the inner lead, but also eliminate the influence of the connecting wire resistance.

 Note: Above just some standard type for reference, all thermocouples or RTD sensors are customized. Contact us for your specification needs.