WRN-230D,WRN-430DThe basic principle of thermocouple temperature measurement is composed of two different materials and conductors with different compositionsClosed loopWhen there are two ends presenttemperature gradientAt this time, there will be current passing through the circuit, and there will be a gap between the two endselectromotive force——Thermoelectric potentialThis is what is calledSeebeck effect(Seebeck effect）。 Two homogeneous conductors with different compositions are thermoelectric electrodes,temperatureThe higher end is the working end, and the lower temperature end is the free end, which is usually at a constant temperature. Create a thermocouple calibration table based on the functional relationship between thermoelectric potential and temperature; The calibration table is obtained under the condition of a free end temperature of 0 ℃, and different thermocouples have different calibration tables.Multi point thermocouples are suitable for production sites where temperature gradients are not significant and multiple positions or locations need to be measured simultaneously. Multi point thermocouples are widely used in large fertilizer synthesis towers, storage tanks, and other devices. It has many advantages such as simple structure, easy manufacturing, wide measurement range, high accuracy, low inertia, and easy remote transmission of output signals. Additionally, since thermocouples are an active typesensorNo additional measurement is requiredpower supplyIt is very convenient to use, so it is often used to measure the temperature of gases or liquids in furnaces and pipelines, as well as the surface temperature of solids.