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technical article
High-precision platinum-rhodium thermocouple
2012-1-14 9:41:24

Our company's B-type S-type R-type platinum-rhodium thermocouples are reliable in quality and guaranteed in testing. Platinum-rhodium thermocouples are a traditional temperature measuring element with stable thermoelectric properties, strong oxidation resistance, and suitable for

Continuous use in thermocouple, inert atmosphere. Long-term use temperature is 1600 ℃, short-term use temperature is 1800 ℃


又称高温贵金属热电偶,铂铑有单铂铑(铂铑10-铂铑)和双铂铑(铂铑30-铂铑6)之分,它们作为温度测量传感器,通常与温度变送器、调节器 Platinum and rhodium thermocouples are also called high-temperature noble metal thermocouples. Platinum rhodium is divided into single platinum rhodium (platinum rhodium 10-platinum rhodium) and double platinum rhodium (platinum rhodium 30-platinum rhodium 6). They are used as temperature measurement sensors, usually related to temperature. Transmitter, regulator

It is used together with display instruments to form a process control system to directly measure or control the temperature of fluids, vapors and gaseous media and solid surfaces in the range of 0-1800 ° C in various production processes.

Selection of platinum-rhodium thermocouple: It is recommended to use a single platinum-rhodium thermocouple (platinum-rhodium 10-platinum) when the measured temperature is normally 1000 ~ 1300 ℃, and it is recommended to use a double-platinum rhodium thermocouple (at a temperature of 1200 ~ 1600 ℃). Platinum rhodium

30-platinum rhodium 6), so that the service life of the platinum-rhodium thermocouple can be guaranteed in the temperature range used.

Platinum and rhodium thermocouples are precious metal thermocouples. The diameter of the wire is specified as 0.5mm, and the allowable deviation is -0.015mm. The nominal chemical composition of the positive electrode (BP) is a platinum-rhodium alloy, which contains 30% rhodium, 70% platinum, and the negative electrode.

(BN) is a platinum-rhodium alloy with a rhodium content of 6%, so it is commonly called a double platinum-rhodium thermocouple. The long-term maximum use temperature of this thermocouple is 1600 ℃, and the short-term maximum use temperature is 1800 ℃.

在热电偶系列中具有准确度最高,稳定性最好,测温温区宽,使用寿命长,测温上限高等优点。 Advantages: Platinum and rhodium thermocouples have the highest accuracy, the best stability in the thermocouple series, a wide temperature range, a long service life, and a high temperature limit. Suitable for oxidizing and inert atmospheres, but also for short-term use

Under vacuum, but not suitable for reducing atmosphere or atmosphere containing metal or non-metal vapor. An obvious advantage of the B-type thermocouple is that it does not need to be compensated with a compensation wire, because the thermoelectric potential is less than 3μV in the range of 0 ~ 50 ° C.

不足之处是热电势,热电势率较小,灵敏读低,高温下机械强度下降,对污染非常敏感,贵金属材料昂贵,因而一次性投资较大。 Disadvantages: The shortcomings of platinum and rhodium thermocouples are thermoelectric potential, small thermoelectric potential, low sensitivity reading, low mechanical strength at high temperature, very sensitive to pollution, expensive precious metal materials, and therefore a large one-time investment. Platinum Rhodium Thermocouple

The working principle is that when a platinum-rhodium thermocouple is connected to a circuit by two ends of two different composition conductors, when the two junction temperatures 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

At this time, the display meter will indicate the temperature value corresponding to the thermoelectric potential generated by the thermocouple.