Thermocouple compensation cable use for pair of insulated conductors with the same nominal value of the thermoelectromotive force of the matched thermocouple over a range of temperatures (including ambient temperature), used to connect thermocouples to the measuring device to compensate them for connection to the thermocouple The error caused by the temperature change at the place.You can check the Thermocouple compensation cable technical specifications.You can check this Thermocouple compensation cable technical specifications.
Thermocouple compensation cable precautions.
1. Compensation wire selection
The compensation wire must be correctly selected according to the type of thermocouple used and the occasion used. For example, the k-type couple should select the compensation conductor of the k-type even, and select the operating temperature range according to the application. Usually, the kx operating temperature is -20 to 100 ° C, and the wide range is -25 to 200 ° C. The normal level error is ±2.5 °C and the precision level is ±1.5 °C.
2. Contact connection
As close as possible to the two contacts of the thermocouple terminal, try to keep the temperature of the two contacts consistent. The temperature is the same as the temperature at the junction of the meter terminal. Where the instrument cabinet has a fan, the contact point should be protected from blowing the fan straight to the contact point.
3. Use length
Because the signal of the thermocouple is very low, it is microvolt level. If the distance used is too long, the attenuation of the signal and the interference of strong electric current in the environment can make the signal of the thermocouple distorted, resulting in inaccurate measurement and control temperature. Temperature fluctuations occur when the control is severe. According to our experience, it is usually better to use the thermocouple compensation wire length control within 15 meters. If it exceeds 15 meters, it is recommended to use a temperature transmitter to transmit signals. The temperature transmitter converts the potential value corresponding to the temperature into a DC current transmission, which is strong against interference.
The compensation wire routing must be kept away from the power line and the interference source. In places where it is not possible to avoid crossing, use crossover as much as possible, not parallel.
5. Shielding compensation wire
In order to improve the anti-interference of the thermocouple cable, a shield compensation wire can be used. For occasions with a lot of on-site interference sources, the effect is better. 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 cable is to extend the cold electrode of the hot electrode, that is, the cold end of the moving thermocouple, and is connected with the display instrument to form a temperature measuring system. The products are mainly used in various temperature measuring devices, and have been widely used in nuclear power, petroleum, chemical, metallurgy, electric power and other departments. The compensation wire ordering needs to indicate the model, specification, core section, number of cores, shielding method and quantity.
You can check this Thermocouple compensation cable technical specifications.