The core principle of WRNK armored thermocouples is thermoelectric effect. When two conductors of different materials (usually referred to as thermoelectric electrodes) are connected at one end (measuring end), if the temperature at that end is different from the temperature at the other end (reference end), an electromotive force (thermoelectric potential) will be generated at the open circuit end of the two conductors. This potential difference caused by temperature differences is called "thermoelectric potential". And the magnitude of thermoelectric potential is only related to the material of the armored thermocouple conductor and the temperature difference at both ends, and is independent of the length and diameter of the thermoelectric electrode. The generated thermoelectric potential is transmitted to the matching display instrument through the circuit, and after processing, the instrument will indicate the corresponding temperature value. In this way, the operator can intuitively understand the temperature situation of the measured object.

Precautions for using WRNK armored thermocouples:

1. Electrical safety regulations

-Correct wiring method: Generally, a three wire connection is used, with a wire cross-sectional area of ≥ 1.0 square millimeter and a resistance value that meets the specified configuration requirements. Pay attention to distinguishing positive and negative polarities to avoid incorrect signals caused by reverse access.

-Shielding interference handling: In situations with strong electromagnetic interference, it is recommended to use cables with shielding layers or lay signal lines away from high current lines.

2. Mechanical protection measures

-Anti bending design: Although the WRNK series supports a certain degree of bending installation, excessive twisting may cause damage to the internal structure. Therefore, in complex working conditions, brackets or conduits should be installed for restraint.

-Wear resistant protective layer: For environments with severe particle erosion, wear-resistant coatings or sheaths can be added externally to extend the service life.

3. Environmental adaptability management

-Temperature limit control: strictly follow the range specified in the product manual to avoid material performance degradation or even melting caused by overheating.

-Moisture and dust prevention treatment: Regularly check the integrity of sealing components and replace aging parts if necessary; Store in a dry and ventilated place to prevent moisture and reduce insulation resistance.

4. Key points of maintenance and upkeep

-Regular cleaning and maintenance: Remove dirt, oxides, or other deposits attached to the surface to maintain good heat dissipation conditions. You can use a soft bristled brush to gently sweep or alcohol to wipe.

-Periodic calibration: Calibration should be conducted at least once a year to ensure measurement accuracy meets process requirements. During the calibration process, reference can be made to the national standard GB/T16839-1997.

5. Response strategies for special working conditions

-Corrosion resistant medium protection: Use protective pipes made of corrosion-resistant materials, such as stainless steel or alloy steel, and ensure reliable sealing.

-High speed fluid impact mitigation: By optimizing the installation angle and adding buffer structures, the impact of flow velocity on measurement results can be reduced.