Double-graduation thermocouple and use method

Abstract

The invention relates to a double-graduation thermocouple and a use method. According to the double-graduation thermocouple, a K-graduation thermocouple and an N-graduation thermocouple are sealed in a stainless steel protection tube, the K-graduation thermocouple comprises a pair of nickel chromium --nickel silicon electrodes, the N-graduation thermocouple comprises a pair of nickel chromium silicon--nickel silicon magnesium electrodes, upper ends of the K-graduation thermocouple and the N-graduation thermocouple are connected with a wiring box, the wiring box is respectively connected with four electrodes through four leads, electric signals in the electrodes are outputted, the lower surface of the wiring box is connected with the upper end of the stainless steel protection tube, and the inner portion of the stainless steel protection tube is sealed. The double-graduation thermocouple is advantaged in that precise verification on the state of the K-graduation thermocouple can be realized as well as detection on data, equipment sealingness is protected, detection accuracy is improved, operation is simple, and work efficiency is high.

Description

technical field [0001] The invention relates to a galvanic couple and a use method, in particular to a double-graduation thermocouple and a use method. Background technique [0002] Due to the advantages of wide operating temperature range, stable performance, and low price, K-graduation thermocouples are widely used in heat treatment equipment, especially medium temperature heating furnaces. Many standards and specifications such as the aerospace material specification AMS2750 require that the system accuracy verification thermocouple of the K graduation number cannot be used for the system accuracy verification of the process thermocouple of the K graduation number. Among the thermocouples that allow system accuracy verification of process thermocouples with K graduation number, since the thermocouples with B, R, and S graduation numbers are all noble metal thermocouples, the cost of thermocouples is relatively high, while the N graduation number The system accuracy verif...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above-mentioned technical problems, the present invention provides a dual-gradation thermocouple and its use method, by simultaneously encapsulating K-gradation thermocouples and N-gradation thermocouples corresponding to positions in the stainless steel protection tube, K The thermocouples with graduation number and N graduation number are equal in length, and a junction box is arranged on the upper end of the K graduation number thermocouple and N graduation number thermocouple. The lower surface of the junction box is set on the upper part of the stainless steel protection tube to encapsulate the inside , which solves the problem in the prior art that when using traditional equipment and methods for system accuracy calibration, it is necessary to plug and unplug the system accuracy calibration thermocouple, which will damage the seal of the equipment and affect the performance of the vacuum equipment. At the same time, the detection accuracy is poor and the operation Complicated and low-efficiency technical issues

Images