With the rapid development of the industry, the use of thermocouple' target='_blank'>thermocouples in production has become more and more extensive. Thermocouples have become one of the most commonly used temperature detection components in the industry. It has the characteristics of high measurement accuracy, wide measurement scale, simple structure, and convenient use. . We understand and analyze products in various ways, and provide various industry knowledge for the vast number of netizens. Let me introduce the types and effects of thermocouple compensation wires. 1. Why use a compensation wire? Because when using a thermocouple to measure temperature, it is necessary to keep the temperature of the reference end of the thermocouple stable, otherwise the measurement error introduced in the temperature measurement will be a big variable, which will affect the temperature measurement. Accuracy. However, in field applications, the reference end of the thermocouple is usually near the high temperature heat source, and the reference end of the thermocouple cannot be stable due to the influence of the heat source, so it is necessary to move the reference end of the thermocouple to a place where the temperature is relatively stable; The same metal material, or in the regular temperature range (usually 0 ~ 100 ℃), the thermoelectric characteristics (thermoelectric power) are the same as those of the matched thermocouple, and it is made of cheap base metal materials that are easy to obtain. It can extend the effect of thermocouples or be used as connecting wires between thermocouples and instruments (such as electronic potentiometers). Therefore, the thermocouple should be connected to the compensation wire when it is used. However, it cannot eliminate the influence of the non-zero reference temperature, so the reference temperature should still be corrected to 0°C in application. 2. When using the compensation wire, it is necessary to pay attention to the following points: 1. Various compensation wires can only be used with corresponding types of thermocouples, that is, various thermocouples and the compensation wires used in the corresponding types of thermocouples, at the specified temperature ( Such as 0 ~ 100 ℃) in the range of thermal power must be consistent. 2. When the compensation wire is connected with the thermocouple meter, the two pairs of connection points should be at the same temperature, and the positive and negative electrodes should not be connected incorrectly. The compensation wire is equivalent to a thermocouple within a certain temperature range (0~100℃), so its current also flows from the positive pole to the negative pole through the reference terminal, so when connecting with the thermocouple, the positive pole of the compensation wire should be connected to the thermocouple The positive pole and the negative pole should be connected to the negative pole of the thermocouple. If the polarity is reversed, not only will the function of the compensation wire be lost, but part of the thermocouple's thermal power will be offset, so that the indicated temperature of the instrument is low. 3. The temperature of the connection point between the compensation wire and the thermocouple shall not exceed the temperature range for regular use. 4. The wire diameter of the compensation wire should be selected according to the different requirements of the equipped instrument. For example, the compensation wire connected to the moving coil type instrument can be selected with a thicker wire diameter to make its resistance value smaller, so that it will not affect the external resistance value of the instrument. 5. For thermocouples with long lines, multi-strand and thick compensation wires can be used to facilitate installation and laying. 3. The compensation wire should be divided into two types: extension type and compensation type according to the different alloy materials of the core wire: Extension type compensation wire: NX (nickel-chromium-silicon-nickel-silicon-magnesium), KX (nickel-chromium 10-nickel-silicon 3), EX (Ni-Cr 10-Cu-Ni 45), JX (Iron-Cu-Ni 45), TX (Cu-Cu-Ni 45). Compensation type compensation wire: SC and RC (copper-copper-nickel 0.6), KC (copper-copper-nickel 40), NC (iron-copper-nickel), etc. 4. Opportunities of using extended or compensating compensation wires: Extension: When the environment where the cold end of the compensating wire is located is greater than 100 degrees or less than 0 degrees, in order to measure the accuracy, as long as the extended compensating wires are used, but the price is more expensive. Compensation type: Economical and cheap, but the cold end temperature must be in a relatively stable place. Five, the necessary characteristics of the compensation wire: 1. The thermoelectric characteristics are stable, the electrical insulation function is good, and the service life is long. 2. Soft, good bending function, easy to use. 3. The coating material is stable and reliable, with certain temperature resistance and cold resistance.
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