A hundred years ago hardly anyone could imagine such rapid development of nonferrous metallurgy. As once said by mark TWAIN. it is difficult to prophesy, especially about the future.
Quality thermocouple wire
Thermocouple wire made from alloys such as alumel, chromel grades TM and T, Kopel, Constantan. Their physical qualities are in direct proportion to the ratio of the components. Alumel is very flexible, able to keep long durability. Constantan in a pair of iron, copper and chromel has a high resistivity, no temperature-dependent. Copel in a pair with copper, iron and chromel has a similar contantino properties: large thermal electromotive force, minimal temperature coefficient of electric resistance, high heat resistance up to 600 °C and resistance to corrosion. Chromel is characterized by high heat resistance and the change in thermo-EMF in a wide range.
The advantages of thermocouple alloys:
- heat resistance;
- high electrical resistance;
- average temperature coefficient of linear expansion;
- low density;
- significant thermoelectric power.
The most important property of thermocouple wire is considered to be highly stable indicator of the thermal EMF in the temperature range.
Manufacturing and measuring of conversion devices, compensating wires, automation systems, operating at high temperatures. The thermocouple comprises two different conductors, one end of which is soldered and placed in the environment to measure the temperature (so-called «hot contact»), and the two loose ends down to the thermostat «cold contact».
How does the thermocouple
The thermoelectric effect is the arising potential difference between conductors of different materials with increasing temperature. The thermocouple is designed for measuring very high temperatures. For accurate readings at relatively low heating of thermocouple is used with high thermal EMF. The positive electrodes of iron, copper or chromel, negative — alumel, Constantan or Copel. The magnitude of the thermal EMF leads thermocouple chromel-Kopel (THC), applied at t° up to 800 °C, followed by copper-Copel and iron-Copel (up to 760°C)… Compensation wire — transfer potential from the free ends of the thermocouple to the sensor. For such wires used cheaper thermocouple wires: chromel grades K and KM, as well as Copel, Constantan. The last two stamps are used for making standard resistance.
Varieties of thermocouple wires
- alumel — chromel (TCA), measurement range 200 — 1000 °C;
- Copel — chromel (TCA), temperature range 200 — 800 °C;
- Constantan — chromel (TCA), measures temperature from -40 to 880 °C;
- iron-Constantan, is used to measure cryogenic temperatures;
- copper-Constantan, measures temperature from 250 to 300 °C;
- iron-Kopel, measures temperature from 0 to 750 °C;
- tungsten-rhenium, is used to determine the highest temperature up to 3000 °C in inert atmosphere.
Supply a certified thermocouple wire. In the technical documentation included data on chemical composition, limiting the percentage of impurities; mechanical qualities of the products. We can buy in bulk any semi-finished products for large-scale production. We also offer optimal conditions for retail customers. A high level of service and speed of service are the face of our company.
Buy at best price
In stock company «Electrocentury-steel» always available high-quality thermocouple wire at the best price. It is based bets on European non-ferrous metals without incorporating extra cost. Certificate of quality products includes data on the chemical composition, limiting the percentage of impurities; mechanical qualities. Cooperation with us gives a number of advantages. Our experts will be happy to provide advice in the purchase of any of the alloys, the correct choice of which will depend on the performance and durability of equipment. We will help to determine not only the optimal parameters of the product, but also offer the best price.