The application of chemical thermocouples in the industry

The application of chemical thermocouples in the industry
Chemical thermocouples include integrated thermocouples, platinum resistors produced using imported Rosemount technology from the United States, hot sleeve thermocouples for high temperature and pressure, and multi pair and multi-point thermocouples for synthesis towers and oil tanks.
The chemical thermocouple adopts a waterproof junction box, which is suitable for the environmental requirements of petrochemical industry; The standard for fixing threads complies with the provisions of JB/T5219-91 and JB/5583-91 for thermocouples and thermal resistors; In addition to meeting the above standards, the fixed flange also includes three different welding methods and fixed flange mounting plates with different sealing surfaces for selection and to meet the needs of different users.
Chemical thermocouple structure
B-type fixed flange is a flat welded steel flange (JB81-94), which is equivalent to the Ministry of Chemical Industry standards (HG5010-58, HG5019-58) and uses a smooth sealing surface. The nominal pressure Pg=25kgf/cm2 is suitable for general requirements. C-type fixed flange, also known as flat welded steel flange (JB81-94), is equivalent to the standards of the Ministry of Chemical Industry (HG5010-58, HG5019-58) and uses a concave convex sealing surface. The nominal pressure Pg=25kgf/cm2 is suitable for toxic and harmful media. Chemical thermocouples have strong anti leakage performance. D-type fixed flange is a welded steel flange (JB82-94) that is equivalent to the Ministry of Chemical Industry standard (HG5016-58) and uses a concave convex sealing surface. The nominal pressure Pg=100kgf/cm 2 has good sealing performance and is suitable for situations where there are certain requirements for sealing and pressure resistance.
Characteristics of Chemical Thermocouples
1. Using reinforced pipes with strong rigidity to support the junction box and resist on-site collisions.
2. Adopting a large cavity junction box for convenient wiring.
3. The temperature measuring element and protective tube are a two section structure that can be quickly replaced.
4. The protective tube has a variety of forms and materials, which can meet the temperature measurement requirements of high temperature, high pressure, and strongly corrosive media.
5. For connections with core protective tubes, if fixed sleeve bolts are used, an additional leak proof part can be added for occasions with leak prevention requirements.
6. Adopting armored temperature measurement core, it is resistant to pressure, earthquake, and works stably and reliably.
The chemical thermocouple protection tube adopts a special structure, which tightly adheres to the inner side of the cracking furnace tube without affecting material flow. It is suitable for temperature measurement and control of cracking furnaces in the ethylene production process. Chemical thermocouples are suitable for temperature measurement and control in high-temperature and high-pressure places in petroleum, chemical and other production processes. They are suitable for temperature measurement and control in refineries, high-pressure polyethylene, and other industries.
The chemical thermocouple adopts a waterproof junction box, which is suitable for the environmental requirements of petrochemical industry; The standard for fixing threads complies with the provisions of JB/T5219-91 and JB/5583-91 for thermocouples and thermal resistors; In addition to meeting the above standards, the fixed flange also includes three different welding methods and fixed flange mounting plates with different sealing surfaces for selection and to meet the needs of different users.

The electrode of a chemical thermocouple is composed of two different conductor materials. When there is a temperature difference between the measuring end and the reference end, a thermoelectric potential is generated, and the working instrument displays the temperature value corresponding to the thermoelectric potential. Chemical thermocouples measure temperature by utilizing the characteristic that the thermocouple of a substance also changes with temperature changes. The heating part (temperature sensing element) of a chemical thermocouple is uniformly double wound with fine metal wire on a skeleton made of insulating material. When there is a temperature gradient in the measured medium, the measured temperature is the average temperature in the medium layer within the range of the temperature sensing element.