High temperature resistant precious metal thermocouple

【Product Details】

High temperature resistant precious metal thermocoupleIt serves as a temperature measurement sensorIt is usually used in conjunction with temperature transmitters, regulators, and display instruments to form a process control system, which is used to directly measure or control the temperature of fluids, steam, gas media, and solid surfaces within the range of 0-1800 ℃ in various production processes.

High temperature resistant precious metal thermocoupleThe allowable deviation is -0.015mm. The nominal chemical composition of the positive electrode (BP) is platinum rhodium alloy, with 30% rhodium and 70% platinum. The negative electrode (BN) is platinum rhodium alloy, with 6% rhodium, hence it is commonly known as a double platinum rhodium thermocouple. The long-term use temperature of this thermocouple is 1600 ℃, and the short-term use temperature is 1800 ℃. B-type thermocouples have the advantages of accuracy, stability, wide temperature measurement range, long service life, and high temperature measurement upper limit in the thermocouple series. Suitable for oxidizing and inert atmospheres, and can also be used in vacuum for a short period of time, but not suitable for reducing atmospheres or atmospheres containing metal or non-metal vapors. A significant advantage of B-type thermocouples is that they do not require compensation wires, as the thermoelectric potential is less than 3 μ V within the range of 0-50 ℃. The shortcomings of B-type thermocouples are thermoelectric potential, low thermoelectric potential, low sensitivity, decreased mechanical strength at high temperatures, high sensitivity to pollution, expensive precious metal materials, and therefore a large one-time investment.

Platinum rhodium thermocouple is composed of two conductors with different compositions connected at both ends to form a circuitWhen the temperatures of two junction points are different, a thermal current will be generated in the circuit. If there is a temperature difference between the working end and the reference end of the thermocouple, the display instrument will indicate the temperature value corresponding to the thermoelectric potential generated by the thermocouple.

The thermoelectric heating of a platinum rhodium thermocouple will increase with the temperature at the measuring end, and its size is only related to the thermocouple material and the temperature at both ends, and is independent of the length and diameter of the thermoelectric electrode. The appearance of various platinum rhodium thermocouples is often very different due to needs, but their basic structures are roughly the same, usually composed of main components such as hot electrodes, insulation sleeves, protective tubes, and junction boxes.

【Application of Platinum Rhodium Thermocouples】

Suitable for high-temperature applications in various production processes, widely used for temperature measurement in powder metallurgy, sintering bright furnaces, vacuum furnaces, smelting furnaces, glass, steelmaking furnaces, ceramic and industrial salt bath furnaces, etc.

Platinum rhodium thermocouples have advantages such as accuracy, stability, wide temperature measurement range, and long service life in thermocouples. It has good physical and chemical properties, stable thermoelectric potential, and excellent oxidation resistance at high temperatures, making it suitable for both oxidizing and inert atmospheres. It has the advantages of accuracy, stability, wide temperature measurement range, and long service life. It has good physical and chemical properties, stable thermoelectric potential, and excellent oxidation resistance at high temperatures, making it suitable for both oxidizing and inert atmospheres. Due to the comparable comprehensive performance of R-type thermocouples and S-type thermocouples, it has been difficult to promote in China. Apart from being used for temperature measurement in imported equipment, it is rarely used for temperature measurement in China.

The shortcomings of platinum rhodium thermocouples are thermoelectric potential, low thermoelectric potential, low sensitivity reading, decreased mechanical strength at high temperatures, high sensitivity to pollution, expensive precious metal materials, and therefore a large one-time investment.

【Common models and specifications】

1.Indicate the thermocouple model, graduation number, and operating temperature range.
2.Diameter and length of thermocouple protection tube(Total length and insertion depth)Material(Corundum ceramic or stainless steel)Wait.
3.Fixed method (fixed or movable thread)、Fixed or movableflange）, need to providecorrespondingsize.