Although the structure of the platinum-rhodium thermocouple is simple, it is necessary to build a good temperature measurement system to accurately measure the temperature, which is mainly composed of the following three parts: the thermoelectrode, the sheath, and the compensation wire. Thermoelectrode Thermoelectrode is usually called platinum-rhodium thermocouple, which is the core component of platinum-rhodium thermocouple that can measure temperature. Due to manufacturing cost considerations, the length of the thermoelectrode is usually limited to about 1 meter, and the on-site temperature measurement point is mostly hundreds of meters away from the control room. Therefore, the platinum rhodium thermocouple needs a terminal to transmit the signal through other forms. Go to the control room. Thermoelectrodes can be divided into different models according to different materials. Industrial field applications usually use K-type and E-type platinum rhodium thermocouples. The K-type platinum-rhodium thermocouple is a nickel-chromium-nickel-silicon platinum-rhodium thermocouple with a wide temperature measurement range. It can be used for a long time within -200-1000 degrees. It can adapt to most conditions in industrial production and has been widely used. The E-type platinum-rhodium thermocouple is a nickel-chromium-nickel-copper platinum-rhodium thermocouple. The use range is -50—600 degrees smaller than that of the K type. However, because the thermoelectric potential generated at the same temperature is larger than that of the K type, the error at low temperature is relatively It is small and has many applications in production around 400 degrees. Thermoelectrode structures are usually divided into two categories: assembled and armored. The assembled platinum-rhodium thermocouple is a common platinum-rhodium thermocouple. The two ends of the thermoelectrode use high-temperature insulating ceramic pillars as insulating sleeves to prevent short circuit at both ends of the platinum-rhodium thermocouple. The end of the thermoelectrode is connected to the insulated terminal On the pillar. This structure is convenient for on-site installation. When the length of the thermoelectrode and the sheath tube are different, it can be freely cut according to the length of the sheath tube, which is convenient and quick for on-site installation. The ceramic insulation sleeve is easy to damage during use, which will cause poor insulation and even cause short circuit between the two conductors of the platinum rhodium thermocouple. Therefore, be careful when disassembling and installing, and ensure the integrity of the ceramic sleeve as much as possible. Jacket temperature is a physical quantity that characterizes material energy. Due to the diffusibility of energy transfer, the energy of different measuring points causes different temperatures. In order to accurately and reliably measure the temperature of the material to improve the accuracy of detection, the temperature measuring point is generally selected as far as possible in the middle of the material in engineering. The platinum-rhodium thermocouple needs to go deep into the pipeline of the equipment under test in use. In order to ensure the safety of production, it is necessary to install a protective sleeve for the platinum-rhodium thermocouple. There are usually two connection methods for the installation of protective sleeves: threaded installation and flange installation. Threaded installation is usually used in pipeline temperature measurement. The advantage of this is that pipeline construction is convenient. In small pipelines, it can be installed in an inclined and upflow direction to improve the accuracy of temperature measurement. The disadvantage is that the safety is poor. The sealing is achieved by threads and gaskets. , Can not be used in high pressure environment. Flange installation is to achieve sealing through the connection between two flanges. It is usually used in the installation of tower equipment and high-pressure pipelines. However, due to the existence of flanges, the fastening bolts are easy to rust and are not conducive to disassembly and installation, and they can only be perpendicular to the installation. The installation of the tower equipment in the direction of the pipeline cannot realize the installation in the forward direction, which is not conducive to heat exchange, and the temperature measurement is not as accurate as the threaded connection. Compensation wire Compensation wire is a special transmission cable for platinum and rhodium thermocouple temperature measuring instruments. Different from ordinary transmission copper cables, as long as the transmitted signal is not distorted, the use of compensation wire is a compensation cable used to continue the thermoelectric potential of the platinum rhodium thermocouple. Due to the high cost of material and manufacturing of the thermode, it is unrealistic to use the finished platinum rhodium thermocouple of several hundred meters to extend from the field to the control room. Therefore, it is necessary to have a transmission line that can have the same thermoelectric potential as the field thermode. Cables that can reduce costs-compensation wires. The use of the compensation wire is not only the transfer of the hot electrode contact potential but also the continuation of the hot electrode temperature difference potential, so its purpose is different from the traditional copper cable. In order to ensure that the thermoelectric potential of the compensation wire is consistent with the thermoelectric potential of the on-site thermode, the compensation wire of the same type as the thermoelectrode should be used in the transmission, and cannot be mixed or misused.
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