Design and Realization of Industrial Thermocouple Automatic Calibration System
Abstract: Thermocouple is the most commonly used type of temperature sensor in industrial production and scientific research. my country's "Measurement Law" stipulates that thermocouples must not only be strictly calibrated when they leave the factory, but also be periodically calibrated or supervised during use to ensure the accuracy of thermocouple temperature measurement. The traditional industrial thermocouple verification work is done by manual operation. This method is to gradually control the temperature of the verification furnace to each temperature verification point with the experience of the operator, and then try to stabilize it for verification. In this paper, aiming at the problems of manual operation, low efficiency, and high labor intensity in the verification process, a computer automatic verification system for industrial thermocouples is designed by making full use of computer data acquisition technology and control technology, as well as abundant software and hardware resources at present. , realizing the automation, intelligence and standardization of the industrial thermocouple verification process. Based on the analysis of the thermocouple verification regulations, the paper introduces the overall design scheme of the industrial thermocouple automatic verification system, the software and hardware system design and the main technical problems to be solved. This system selects the high-precision and remote-controllable multifunctional test instrument HP34401A Multimeter, and uses the serial port line to connect the upper computer with HP34401A to realize the automatic collection of verification data, and uses the combination of solid state relay and PID regulator to automatically control the temperature of the verification furnace . The verification system software is written in Visual Basic 6.0, which can realize automatic control of furnace temperature, automatic verification of thermocouples, automatic storage of verification data, historical data query and inspection...
