ZAN-EX-HA-FP2FRP2-2 * 2 * 1.5E type compensating wire

ZAN-EX-HA-FP2FRP2-2 * 2 * 1.5E compensation wire is used in thermocouple temperature measurement systems to connect thermocouples and their display instruments. In the process of thermocouple temperature measurement, the thermoelectric potential generated by the thermocouple is directly related to the temperature of the measurement point. However, the thermoelectric potential generated by the thermocouple is often weak and easily affected by the external environment. Therefore, compensation wires are needed to transmit the thermoelectric potential generated by the thermocouple to the display instrument.

The main function of compensating wires is to 'compensate'. Due to the different materials of thermocouples and compensating wires, their thermoelectric potentials at the same temperature may also vary. However, when the compensating wire is connected to the thermocouple and in the same temperature gradient, the compensating wire can generate a thermoelectric potential that is opposite in direction and equal in magnitude to the thermoelectric potential of the thermocouple, thereby offsetting the error in the thermoelectric potential of the thermocouple and enabling the display instrument to accurately display the temperature of the measurement point.

The ZAN-EX-HA-FP2FRP2-2 * 2 * 1.5E compensation wire thermocouple compensation cable should adopt a process structure of sealed insulation and sheath. It should have excellent moisture-proof and anti-corrosion properties, and the manufacturing of high-temperature compensation cables should adopt good production processes. The measurement accuracy should meet the requirements of relevant national standards.

Maximum long-term working temperature of cable:+200 ℃ (high temperature resistance); Environmental temperature: -40 ℃; Insulation resistance: not less than 25M Ω. km at a temperature of 20 ℃; working capacitance: less than 80 PF/m; Unbalanced capacitance: less than 1 PF/m; Distributed inductance: less than 0.6 μ H/m; Static induced voltage (static voltage 20KV): less than 10 mV; electromagnetic interference induced voltage (50HZ, 400A/m): less than 5 mV; the allowable bending radius for unarmored cables is not less than 10 times the outer diameter of the cable, and the allowable bending radius for armored cables is not less than 12 times the outer diameter of the cable. The rated voltage of the thermocouple compensation cable is 300V. The core material of the thermocouple compensation wire should be used in accordance with the required thermocouple material in ANSI MC96.1. Each pair of thermocouple compensation cables should be color coded according to ICEA requirements, and the code should be printed on the insulation layer of the wire, with one printed every meter to distinguish the material of the wire. Each pair of compensation cables with multiple wires should also have a digital code.

ZAN-EX-HA-FP2FRP2-2 * 2 * 1.5E type compensating wireBoth use extended compensating cables or wires, and the nominal chemical composition and thermoelectric potential of the alloy wire are the same as those of the thermocouple wire used. The performance of alloy wire should comply with GB4990 "Alloy Wire for Compensation Wires for Thermocouples".

The surface of the conductor should be smooth, free of oil stains, without burrs or sharp edges that damage the shielding and insulation, and without protruding or broken single wires. The cable core conductor should be a circular single wire twisted tightly.

Suppliers should be able to ensure that the cables provided can operate and be stored during shutdown under the following conditions.

(1) The rated operating temperature of the cable conductor is 70 ° C.

(2) The maximum temperature of the cable conductor during a short circuit shall not exceed 160 ° C.

(3) The short circuit time shall not exceed 5 seconds.

2 Insulation

1) The insulation layer should be tightly extruded onto the conductor and easily peeled off without damaging the insulator or conductor. The insulation layer should have a uniform color, a smooth surface, and no mechanical damage. The extrusion method for cable insulation is extrusion type, and the extrusion method for fire-resistant cable insulation is extrusion tube type.

2) The electrical and physical characteristics of insulation should comply with the requirements of national standards and IEC standards. The nominal insulation thickness shall comply with the provisions of GB12706.2, and the average insulation thickness shall not be less than the specified nominal value. The minimum thickness at any location shall not be less than 90% -0.1mm of the nominal thickness, and the maximum insulation thickness tmax and minimum insulation thickness tmin measured at the same section shall comply with the following formula: (tmax tmin)/tmax ≤ 0.1.

3) The insulated wire core should be able to withstand the AC spark test specified in GB/T3048.9 as an intermediate inspection, with a test voltage of 4KV and a frequency of 50Hz.

4) Insulation should be identified by color identification, but in multiple pairs of cables, the coloring of the cores should be consistent. The same number should be printed on the two different colored cores in each pair, and the color of the number should have a significant color difference from the insulation color. The numbers must be legible, and the arrangement of the markings should comply with the corresponding provisions of GB6995. The color should not migrate or fade.

3 sheaths

1) The main function of the cable outer sheath is to enhance insulation performance and protect the cable from mechanical damage. The sheath should be tightly extruded onto the stranded insulated wire core, isolation layer or armor layer, and should be easy to peel off without damaging the insulation or sheath. The surface of the outer sheath should have a tightly bonded semiconductor layer, and the sheath surface should be smooth and uniform in color.

2) The outer sheath should have tensile, waterproof, flame-retardant or fire-resistant, wear-resistant and oil resistant properties, and should comply with the requirements specified in national standards and IEC standards. Chemical additives can be used when there are special requirements for termite prevention, but the additives used should not include materials that are harmful to humans and the environment.

3) The outer sheath is usually black, and other colors can be determined based on mutual agreement to adapt to the specific conditions of cable use.

4) The thickness of the sheath complies with the provisions of GB/T 12706.2 to GB/T 12706.3 standards. The average value of the non armored cable sheath should not be less than the nominal value, and the minimum thickness at any point should not be less than 85% -0.1mm of the nominal value;

4 shielding

Shielded cables should have one or more metal strips wrapped around the core or a metal wire flat structure to form a metal shield.

1) Shielded cables should have a shielding layer composed of copper strips or round copper wires outside the cable core.

2) The shielding layer and cable core should be overlapped and wrapped with two layers of suitable non hygroscopic tape or extruded inner lining. The shielding layer and cable core should be overlapped and wrapped in two layers of 0.05mm thick non hygroscopic tape that will not melt at the highest rated working temperature of the cable, with a minimum overlap of 25% for each layer; Outside the total shielding layer, it is allowed to wrap a layer of 0.05mm thick non hygroscopic tape that will not melt at the maximum rated working temperature of the cable.

(A) Shielding requirements:

Copper wire braided shielding uses round copper wire, with a braiding density requirement of over 80% coverage and a braided wire diameter greater than 0.15mm (the nominal diameter of round copper wire used for braiding should meet relevant specifications). The woven layer is not allowed to be connected as a whole, and the exposed copper wire ends should be trimmed neatly. Metal wire ingots are allowed once per 1 meter length.

(B) General shielding requirements:

(a) Copper wire braided shielding requires a braiding density of over 80% coverage, and the nominal diameter of the round copper wire used for braiding should meet relevant regulations. The woven layer is not allowed to be connected as a whole, and the exposed copper wire ends should be trimmed neatly. Copper wire braiding layer is not allowed to be welded as a whole.

(b) Use soft copper tape with a thickness of 0.05-0.10mm for overlapping wrapping or longitudinal wrapping, with an overlap rate of not less than 15%. When wrapping the tape, a drainage wire consisting of a round copper wire or tin plated round copper wire with a nominal cross-section of not less than 0.5mm2 should be placed longitudinally under the metal tape.

The diameter of the total shielding drainage wire should be greater than 0.6mm.

5 Flame retardant

1) The flame retardancy of cables should comply with the relevant provisions of the current national standard GB/T 18380.3 "Combustion Test of Cables under Flame Conditions Part 3: Combustion Test Method for Bundled Wires or Cables".

2) The flame retardancy and fire resistance of the cable meet the requirements of GA 306.1~306.2 and the relevant requirements of the current national standard "Test Method for Burning of Wire and Cable" GB12666.

Keywords:ZAN-EX-HA-FP2FRP2-2 * 2 * 1.5E type compensating wire