Tiankang Platinum Rhodium Thermocouple

Tiankang Platinum Rhodium Thermocouple

Platinum rhodium thermocouple is a traditional temperature measuring element with stable thermoelectric performance and strong oxidation resistance, suitable for continuous use in oxidizing and inert atmospheres. The long-term usage temperature is 1600 ℃, and the short-term usage temperature is 1800 ℃. The technical specifications of the paper recorder are as follows:

Insulation resistance: 5 M Ω (at 20 ℃)

Specifications and dimensions: 50075010001200 (mm)

Main technical parameters

Electrical export: M20x1.5, NPT1/2

Accuracy level: I, II

Protection level: IP65

Wire diameter: Φ 0.5

Nominal pressure: atmospheric pressure

Application of Platinum Rhodium Thermocouples

Also known as high-temperature precious metal thermocouple, platinum rhodium includes single platinum rhodium (platinum rhodium 10 platinum rhodium) and double platinum rhodium (platinum rhodium 30 platinum rhodium 6)

Platinum rhodium thermocouples, as temperature measurement sensors, are usually used in conjunction with temperature transmitters, regulators, and display instruments to form process control systems. They are 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.

Tiankang Platinum Rhodium Thermocouple

Platinum rhodium thermocouple is a precious metal thermocouple. The diameter of the thermocouple wire is specified as 0.5mm, with an allowable deviation of -0.015mm. The nominal chemical composition of its positive electrode is platinum rhodium alloy, containing 30% rhodium and 70% platinum. The negative electrode is platinum rhodium alloy, containing 6% rhodium, hence it is commonly known as a double platinum rhodium thermocouple. The maximum long-term operating temperature of this thermocouple is 1600 ℃, and the maximum short-term operating temperature is 1800 ℃.

Advantages of Platinum Rhodium Thermocouples

Platinum rhodium thermocouples have the highest accuracy, best stability, wide temperature range, long service life, and high upper temperature 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 ℃.

Disadvantages: 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 large one-time investment.

The working principle of platinum rhodium thermocouple is that when two conductors with different compositions are connected at both ends to form a circuit, a thermal current will be generated in the circuit when the temperature of the two junction points is different. 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.

Selection of Platinum Rhodium Thermocouples: It is recommended to use a single platinum rhodium thermocouple (Platinum Rhodium 10 Platinum) when measuring temperatures between 1000 and 1300 ℃, and a dual platinum rhodium thermocouple (Platinum Rhodium 30 Platinum Rhodium 6) when measuring temperatures between 1200 and 1600 ℃. This ensures the service life of the platinum rhodium thermocouple within the temperature range used.