Overview and use

Industrial assembled 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 liquids, vapors, gases, and solids in the range of 0 ℃ to 1800 ℃ during various production processes.
According to national regulations, all types of thermocouples produced by our company comply with IEC international standards.
Product execution standards: IEC584 、IEC1515 GB/T16839-1997

Working principle

Two conductors with different compositions are welded at both ends to form a circuit. The temperature measuring end is called the measuring end, and the wiring terminal 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 temperature value corresponding to the thermoelectric potential generated by the thermocouple.
Thermoelectric properties are a universal characteristic of matter, but only a pair of metal conductors with good linearity, stability, repeatability, high thermoelectric potential, easy standardization, abundant material resources, easy purification, and good corrosion resistance in the relationship curve between thermoelectric potential and temperature can become materials for making thermocouples. Thermocouple is the most widely used on-site temperature measuring instrument.
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.

Nominal pressure of thermocouple

Generally refers to the static external pressure that the protective tube can withstand at working temperature without breaking. In fact, the allowable working pressure is not only related to the material, diameter, and wall thickness of the protective tube, but also to its structural form, installation method, insertion depth, as well as the flow rate and type of the measured medium.

Minimum insertion depth of thermocouple

It should not be less than 8-10 times the outer diameter of its protective tube (except for special products).

Structure of Thermocouples Product Structure

From the temperature measurement principle of thermocouples, it can be known that in addition to the two thermoelectric electrode materials, the most basic thermocouple must also be made into measuring and reference ends at both ends of the thermoelectric electrode according to requirements, commonly known as the "hot end" and "cold end", which are the so-called "two ends".
According to the different uses of thermocouples, there are four forms of the hot end: insulated, multi branch insulated, shell connected, and exposed. The cold end has two forms: sealed and unsealed.
Thermocouples are generally composed of five parts. Two thermoelectric electrodes (or wires) are the core part of the thermocouple (the first part is the temperature measuring element), and the other parts are spread around it. In order to ensure that the thermoelectric potential in the circuit is not lost and the measured temperature signal is accurately transmitted, insulation materials must be used to ensure reliable insulation between the two thermoelectric electrodes except for the two endpoints and between them and the outside world (the second part is insulation materials); In order to protect the insulation material and thermocouple wires and extend the service life of thermocouples, protective sleeves (Part III protective sleeves) are generally designed; In order to facilitate installation and wiring, and to adapt to various usage scenarios, a fourth part wiring device and a fifth part installation fixing device are generally designed. These are the so-called 'Five Parts'. According to different purposes, the most basic thermocouple (i.e. thermocouple core) that can measure temperature does not have protective tubes or fixed installation devices. Prefabricated thermocouples are mainly composed of a junction box, protective tube, insulating sleeve, terminal block, and thermoelectric electrode, and are equipped with various installation and fixing devices.

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