Thermocouple correcting device and method

Abstract

The invention discloses a thermocouple correcting device and a thermocouple correcting method. The thermocouple correcting device can comprise a data preprocessing unit, a comparison unit, a compensation unit and a control unit, wherein the data preprocessing unit respectively acquires voltage values from one or more thermocouples and converts the voltage values into original temperature values; the comparison unit compares the original temperature values with a preset temperature error model so as to determine error compensating coefficients of the original temperature values; the compensation unit associates the error compensating coefficients with the original temperature values to acquire compensation temperature values; and the control unit adjusts the temperature of application occasions of the one or more thermocouples according to the compensation temperature values. The thermocouple correcting device and the thermocouple correcting method can prolong the service time of the thermocouples, and can reasonably adjust the temperature of application occasions of the thermocouples so as to effectively save energy.

Description

technical field [0001] The present application relates to a thermocouple calibration device and a calibration method thereof. Background technique [0002] Thermocouples have the advantages of large thermoelectric potential and high sensitivity, and are widely used in occasions such as firing systems to implement real-time temperature control in various applications. The principle of thermocouple temperature measurement can be simply understood as a pair of heterogeneous conductors forming a closed loop. When the junction of the conductors is placed in a different temperature field, a temperature difference electric effect will occur, and there will be a current in the loop, so the conductor The two junctions of the set generate a corresponding thermomotive force, which is called "Seebeck voltage". The temperature can be measured by measuring the "Seebeck voltage". [0003] However, due to the temperature and humidity of the environment where the thermocouple is located, t...

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Problems solved by technology

However, after using this method to correct the temperature of the thermocouple, a negative temperature error will still occur when the thermocouple is used for a period of time

For example, during the roasting process of N-type thermocouples, carbon particles may adhere to or even infiltrate into the thermocouple protective sleeve at high temperature, resulting in a decrease in the thermal conductivity of the thermocouple protective sleeve, which in turn makes the detection temperature value low

The existence of negative error has great harm to the production process, mainly reflected in the fact that negative error will consume more gas energy, and at the same time, excessive consumption of gas will cause the furnace temperature to be too high, and even cause damage to the furnace

[0004] In the existing production process, when it is found that the error value of the thermocouple is too large to realize normal production, the old thermocouple can only be discarded and a new thermocouple is used, resulting in unnecessary waste

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