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Compression spring fixed thermocouple:
The working principle, indexing characteristics and allowable deviation of the WRET-01 type thermocouple, the temperature compensation of the reference end (cold junction), and the connection method with the display measuring instrument are the same as those of the general thermocouple. The structure of the WRET-01 type thermocouple is composed of a protection tube, mounting bolts, locking clamps, springs and thermal resistance wires.
Armored thermocouples:
The working principle of the armored thermocouple is that the two different components of the conductor are welded to form a loop. The direct temperature measurement terminal is called the measurement terminal and the terminal is called the reference terminal. When there is a temperature difference between the measuring end and the reference end, a thermal current will be generated in the circuit, and the display instrument will be connected. The corresponding temperature value of the thermoelectromotive force generated by the thermocouple will be indicated on the meter. The thermo-electromotive force of the armored thermocouple will increase as the temperature at the measuring end rises. The magnitude of the thermo-electromotive force depends only on the material of the sheathed thermocouple conductor and on the temperature difference at both ends, and is independent of the length and diameter of the thermo-electrode. The structure of the armored thermocouple is drawn from the conductor, insulating magnesium oxide and 1Cr18Ni9Ti stainless steel protection tube. The armored thermocouple product is mainly composed of junction box, terminal and armored thermocouple and is matched with the basic structure. A variety of mounting fixtures make up. Armored thermocouples are divided into insulation type and shell type.
Assembly thermocouples:
The conductors of the two different components are soldered and form a loop at both ends. The direct temperature measurement terminal is called the measurement terminal and the connection terminal terminal is called the reference terminal. When there is a temperature difference between the measuring terminal and the reference terminal, a thermal current will be generated in the circuit, and the display instrument is connected. The thermocouple and the corresponding temperature value of the generated thermo-electromotive force are indicated on the instrument.
Petrochemical thermocouple:
The electrode of the galvanic couple consists 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 gauge shows the temperature value corresponding to the thermoelectric potential. Thermal resistance is based on the relationship between resistance and temperature. When there is a temperature change in the measured medium, the resistance value of the medium changes as well, and the working instrument shows the temperature value corresponding to the resistance value.
With temperature transmitter explosion-proof thermocouple:
Explosion-proof thermocouples use the explosion-proof flameproof principle. When an explosion occurs in the cavity, the flame can be extinguished and cooled through the joint gap, so that the full temperature of the flame after explosion can not be transmitted outside the cavity.
The thermoelectric potential (resistance) generated by the thermocouple (thermal resistance) generates an unbalanced signal through the bridge of the temperature transmitter, and after being amplified, it is converted into a 4-20 mA DC signal to the working instrument, and the working instrument displays the corresponding temperature value. .
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