Product description: In the production process, due to the harsh environment, shielded thermocouple wire sometimes needs to pass through the high temperature zone or the electromagnetic interference zone.
In the production process, due to the harsh environment, shielded thermocouple wire sometimes needs to pass through the high temperature zone or the electromagnetic interference zone. The shielded wire core adopts the same material as the wire conductor of the thermocouple electrode, and the copper wire braided shield mesh is wrapped to meet the large computer. Technical requirements for system anti-interference.
shielded thermocouple wire structure
shielded thermocouple wire technical requirements The structure of the compensation wire is generally composed of conductor, insulation, sheath or shielding. The structure and main technical requirements are briefly described as follows: (1) Conductor. The conductor material should be selected according to the type of compensation wire. The core is divided into two types: single wire and multiple strands. The specific specifications (wire cross section) range from 0.2mm2 to 2.5mm2. (2) Insulation layer. The insulating material of the ordinary compensation wire is made of polyvinyl chloride insulation material. The surface of the insulation layer shall be flat, uniform in color and free of mechanical damage; the thickness tolerance of the insulation layer shall be -10% of the nominal thickness, and the thickness of the thinnest part shall not be less than 90% of the nominal value; the insulation layer shall be subjected to AC 50Hz, voltage For the 4000V spark test without breakdown, the operating speed of the spark tester should ensure that the insulation layer is subjected to voltage action time of not less than 0.1s per point. The insulation of the heat-resistant compensation wire is polytetrafluoroethylene. The thickness tolerance of the insulation shall not exceed - 20% of the nominal thickness, and the thickness of the thinnest part shall not be less than 90% of the nominal value. The outer diameter of the insulated core may be partially enlarged, but the outer diameter of the thick portion shall not exceed the maximum outer diameter. value. (3) Sheath. The sheath material of the ordinary compensation wire is made of polyvinyl chloride sheathing material. The sheath should be tightly wrapped on the insulation layer of the wire core, the insulation layer and the sheath are not adhered, the surface should be flat and the color is uniform; the allowable deviation of the thickness of the sheath is - 20% of the nominal thickness, and the thickness of the thinnest part should be Not less than 80% of the nominal value. The sheath material of the heat-resistant compensation wire is selected from a PTFE sheath material or an alkali-free glass fiber. The PTFE sheath should be tightly wrapped on the insulation layer of the wire core, the insulation layer and the sheath should not be adhered, the surface should be flat and the color should be uniform; the allowable deviation of the thickness of the sheath is - 20% of the nominal thickness, the thinnest part The thickness should be no less than 80% of the nominal value. The alkali-free glass woven sheath has a weaving density of not less than 90%. (4) Shielding layer. The shielding layer is mainly made of tinned copper wire or galvanized steel wire braided, aluminum-plastic composite tape, and copper-plastic composite tape wrapped. The weaving density of the braided shield is ≥ 80%, and the broken head should be trimmed after being connected. When the package is shielded, the aluminum (copper) composite tape should be closely attached to the insulation layer and not easy to loose; the thickness of the shielding layer should not exceed 0.8 mm. When the temperature at the junction of the shielded thermocouple wire and the thermocouple is lower than 100 °C, the ordinary type of compensation wire of the general sheath can be selected. When the temperature is between 100 and 200 °C, the heat-resistant compensation wire of the heat-resistant sheath should be selected. In the environment with electromagnetic interference, in order to improve the anti-interference of the compensation wire for thermocouple, the tinned copper wire or galvanized steel wire braided, copper-plastic tape or aluminum-plastic tape wrapped shielding compensation wire should be used. However, the shielding layer must be strictly grounded, otherwise the shielding layer will not only play the role of shielding, but will enhance the interference.Thermocouple compensation wire type and alloy wire material
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