Cot surface thermocouple

An outlet temperature of the ethylene cracking furnace (COT) surface thermocouple, comprising:

• a contact type temperature measuring component, a sleeve, a connecting sealing component, a clamping sleeve component, a temperature measuring component and a junction box;
• wherein the COT surface thermocouple is arranged on a surface of a furnace tube of an ethylene cracking furnace;
• the contact type temperature measuring component is completely in contact welding with the surface of the furnace tube;
• a whole body is in an inclined angle;
• the contact type temperature measuring component is connected with the sleeve in a concentric welding counter bore or a connecting internal thread;
• the sleeve and the contact type temperature measuring component are in concentric non-bending connection;
• the sleeve is formed by splicing two sections;
• the two sections of sleeves are connected through the connecting sealing component to form a sealing cavity;
• and the sleeve is connected with the clamping sleeve component.