Basic concepts and working principles of fixed thread cone thermocouples

Industrial assembled stainless steel junction box thermocouples are commonly used as temperature sensors in conjunction with display instruments, recording instruments, and electronic regulators. It can directly measure the surface temperature of liquid, vapor, gas media, and solids in the range of 0 ℃ -1800 ℃ during various production processes.

According to national regulations, our factory has been producing platinum rhodium 30 platinum rhodium 10 platinum, nickel chromium nickel silicon, nickel chromium copper nickel, copper copper nickel, iron copper nickel and other types of thermocouples that comply with IEC standard division numbers since 1987. They should meet the JB/T9238-1999 standard.

working principle

The working principle of a thermocouple is that two conductors with different compositions are welded at both ends to form a circuit. The direct temperature measuring end is called the measuring end, and the connecting end is called the reference end. When there is a temperature difference between the measurement and reference ends, a thermal current will be generated in the circuit. When connected to a display instrument, the instrument will indicate the corresponding temperature value of the thermoelectric potential generated by the thermocouple.

The thermoelectric potential of a thermocouple will increase as the temperature at the measuring end rises. The magnitude of the thermoelectric potential is only related to the material of the thermocouple conductor and the temperature difference between the two ends, and is independent of the length and diameter of the thermoelectric electrode.

Prefabricated thermocouples are mainly composed of a junction box, protective tube, insulating sleeve, terminal block, and thermoelectric device, and are equipped with various installation and fixing devices.