K-type thermocouple compensation wire use characteristics
1. The highest working temperature of the conductor: heat-resistant grade: poly-ethylene propylene (F46) 200℃, soluble polytetra-ethylene 260℃, silicone rubber 180℃, ordinary grade: polyvinyl chloride 70℃ and 105℃, cross-linked polyethylene 90 ℃, low-smoke halogen-free flame-retardant polyolefin 70℃, cross-linked 90℃ and 125℃.
2. Low ambient temperature: PVC sheath: -40℃ for fixed laying, -15℃ for non-fixed laying, plastic insulation and sheath: -60℃ for fixed laying, -20℃ for non-fixed laying.
3. Allowable bending radius of cables: the minimum of non-armoured cables is 6 times the outer diameter, the minimum of copper tape shielded or steel tape armored point cables is 12 times the outer diameter of the cable, and the minimum plastic insulation and sheath is 10 times the outer diameter of the cable.
K-type thermocouple compensation wire is the most commonly used thermocouple. It is connected with the adjustment and display instruments, almost without exception, using copper-copper-nickel 40 compensation wire. This kind of compensation wire is cheap. However, the mechanical properties of the positive and negative pole materials are very different, and the positive wire has very poor strength and is not resistant to flexing. Therefore, it is designed with a thicker wire diameter, which makes installation and use inconvenient. This is its insurmountable shortcoming. Generally, PVC insulated and sheathed compensation wires or cables have excellent moisture-proof, wear-resistant and flame-retardant properties; high temperature resistance * plastic insulated and sheathed compensation wires or cables adopt continuous extrusion process, which is more resistant to high temperature, cold, It is resistant to acid, alkali, oil and water, non-flammable, and anti-aging. The product quality is higher than the national standard GB/T4989-94 (equivalent to IEC584-3).
K-type thermocouple compensation wire model
The function of is to extend (compensate) the hot electrode, that is, the cold end of the mobile thermocouple, which is connected with the display instrument to form a temperature measurement system. This product equivalently adopts: IEC584-3 "Thermocouple Part III-Compensation Wire" international standard, and the product quality is better than B4989-85 "Thermocouple Compensation Wire" national standard. The insulating layer and the protective layer are made of imported high-quality fluoroplastics, and the whole continuous extrusion process is adopted, so that the product has excellent acid resistance, alkali resistance, abrasion resistance and non-flammability, and can be used for long-term use in oil and water. The operating temperature is -60～205～260℃, which belongs to the contemporary international advanced level. The products are mainly used in various temperature measuring devices, and have been widely used in petroleum, chemical, metallurgy, electric power and other departments. Model and name: Compensation wire model is divided into: SC, KC, KX, EX, JX, TX according to product variety. Among them: a) The first letter of the model corresponds to the graduation number of the thermocouple; b) The letter "X" represents the extension type compensation wire (type) c) The letter "C" represents the compensation type compensation wire (type) Note : SC type compensation wire can be equipped with R type thermocouple with graduation number.