Tungsten-rhenium thermocouple calibration data acquisition system

Abstract

The invention relates to a tungsten-rhenium thermocouple calibration data acquisition system which comprises a main station and an auxiliary station that are connected with each other through a process field bus, wherein the main station comprises a first-class main station which interacts with the auxiliary station through the process field bus and a second-class main station that can set the process field bus and performs communication with the first-class main station. The auxiliary station comprises a standard infrared temperature acquisition device and a calibrated thermocouple potential acquisition device which are connected with the process field bus. The tungsten-rhenium thermocouple calibration data acquisition system is suitable for a high-temperature tungsten-rhenium thermocouple automatic calibration system and has advantages of high speed, high efficiency, high automation degree, etc. Furthermore the tungsten-rhenium thermocouple calibration data acquisition system can perform data acquisition and calibration in a temperature range of 800 DEG C to 2300 DEG C. The tungsten-rhenium thermocouple calibration data acquisition system fills a gap in a temperature range of 1500 DEG C to 2300 DEG C in the current industry.

Description

technical field [0001] The invention relates to a data acquisition system, in particular to a tungsten-rhenium thermocouple verification data acquisition system based on a process field bus. Background technique [0002] In various industries such as metallurgy, petroleum, chemical industry, machinery, aerospace and other industries, the measurement of temperature is of great significance. At present, according to different measurement methods, temperature measurement can be roughly divided into two categories, one is contact measurement, and the other is non-contact measurement. For contact measurement, thermocouple is the most used temperature measuring element. Thermocouple is a common temperature measurement element based on the principle of thermoelectric effect, which has been widely used in various industries, especially in some high temperature measurement environments such as metallurgy, aerospace industry, etc. But for the thermocouple itself, according to the na...

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Problems solved by technology

At present, the verification work of all thermocouples needs to be carried out in accordance with the content stipulated in the National Metrology Technical Specifications of the People's Republic of China. According to different specifications, the working temperature of thermocouples is 300 ° C ~ 2200 ° C, 20 ° C ~ 2800 ° C ℃ and 0~1500℃, etc., but in the specification for 0~1500℃, only the verification work of the tungsten-rhenium thermocouple in the working range of 0~1500℃ is explained, but there is no correlation for the calibration above 1500℃ In 1988, the Liaoning Provincial Institute of Metrology and Testing Technology was entrusted by the national metrology department to draft the "JJG576-1988 Verification Regulations for Tungsten-Rhenium Thermocouples for Work", which is for the temperature of tungsten-rhenium thermocouples at 0 to 2300 ° C. The verification method was explained accordingly, but it was replaced by the specification "JJF 1176-2007" in 2007. Since then, the verification specification for 1500-2300 ° C has been blank; but the tungsten-rhenium thermocouple is often in this range Therefore, how to calibrate the tungsten-rhenium thermocouple used in this range needs to be solved, and what kind of standard is used to standardize its verification also needs to be studied

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