K-type thermocouples have a wide range of applications, and they follow certain laws in the process of exerting their functions. Do you know what these laws are? What effect do these laws have on K-type thermocouples? 1. The law of homogeneous conductor. Thermocouple wire is welded at both ends of the same homogeneous material (conductor or semiconductor) to form a closed loop. No matter how the conductor cross section and how the temperature is The potential is low. It can be seen that the thermocouple must be composed of two different homogeneous conductors or semiconductors. If the thermoelectrode material is not uniform, additional thermoelectric potential will be generated due to the existence of the temperature gradient. 2. The law of the middle conductor When the middle conductor (third conductor) is connected to the thermocouple circuit, as long as the temperature at both ends of the middle conductor is the same, the introduction of the middle conductor has no effect on the total electric potential of the thermocouple circuit. This is the law of the middle conductor. Application: According to the law of intermediate conductor, in the actual temperature measurement application of thermocouple, the form of hot end welding and cold end open circuit is often used, and the cold end is connected with the display instrument through the connecting wire to form a temperature measurement system. Some people worry that using copper wires to connect the cold end of the thermocouple to the meter to read the mV value, the contact potential generated at the junction of the wire and the thermocouple will cause additional errors in the measurement. 3. The law of intermediate temperature The thermoelectric potential between the two junctions of the thermocouple circuit (temperatures T, T0) is equal to the algebraic sum of the thermoelectric potential of the thermocouple at the temperature of T, Tn and the thermoelectric potential of the temperature of Tn, T0. Tn is called the intermediate temperature. Application: Due to the non-linear relationship between thermocouples ET, when the cold junction temperature is not 0 degrees Celsius, the actual thermoelectric potential E(t, t0) of the known loop cannot be used to directly find the hot junction temperature value; Use the actual thermoelectric potential E(t, t0) of the known loop to directly look up the temperature value obtained from the table, plus the cold junction temperature to determine the measured temperature of the hot junction, which needs to be corrected according to the law of intermediate temperature. 4. Reference electrode law Use high-purity platinum wire as the standard electrode. Assuming that the positive and negative electrodes of the nickel-chromium-nickel-chromium thermocouple are paired with the standard electrode, the sum of their values u200bu200bis equal to the value of the nickel-chromium-nickel-chromium.
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