1. What is a thermocouple ?
Thermocouple is one of the most commonly used temperature detection elements in the industry. The working principle of thermocouple is based on Seebeck effect, that is, two ends of conductors of two different components are connected into a circuit. If the temperature of the two connection ends is different, it will be generated in the circuit. Physical phenomenon of thermal current. Its advantages are:
High measurement accuracy. Because the thermocouple is in direct contact with the measured object, it is not affected by the intermediate medium.
Simple structure and easy to use. Thermocouples are usually composed of two different metal wires, and they are not limited by size and opening. They have protective sleeves and are very convenient to use.
Wide measurement range. Commonly used thermocouples can be continuously measured from -50 to + 1600 ° C. Some special thermocouples can measure as low as -269 ° C (such as gold-iron-nickel-chromium) and up to + 2800 ° C (such as tungsten-rhenium).
What is the basic principle of a thermocouple ?
Solder two conductors or semiconductors A and B of different materials to form a closed loop, as shown in Figure 2-1-1. When there is a temperature difference between the two attachment points 1 and 2 of the conductors A and B, an electromotive force is generated between them, and a large current is formed in the circuit. This phenomenon is called a thermoelectric effect. Thermocouples use this effect to work.
Jinhu Dongxiang Instrument Co., Ltd. main products: electromagnetic flowmeter , orifice flowmeter , v-cone flowmeter, turbine flowmeter, vortex flowmeter, Verabar flowmeter, precession vortex flowmeter, thermal resistance, thermocouple, Bimetal thermometer, pressure (differential) force transmitter, pressure gauge, pressure calibrator, calibration simulator , paperless recorder , intelligent RF admittance level meter, ultrasonic liquid (level) level meter, radar liquid level Gauges, magnetic flap level gauges, safety barriers, isolators and more.