Thermocouple thermometers are widely used in laboratories and industry, the ice-water mixture is usually used as cold end compensation for thermocouple thermometer measurement. However, the ice-water mixture has disadvantages, such as complex manufacturing process, short use time, and unstable internal temperature field. The zero-temperature thermostat can replace the traditional ice water mixture to provide a stable temperature field environment. However, there is no suitable measurement method that can evaluate the zero-degree thermostat to meet the measurement requirements of thermocouple thermometer. Therefore, comparative experiments on temperature deviation, volatility, axial temperature field uniformity, radial temperature field uniformity, and load characteristics of the ice-water mixture and the zero-temperature thermostat are evaluated. In addition, the uncertainty of the zero-temperature thermostat and the ice water mixture is also proposed. The results reveal that the measurement results of temperature deviation, volatility, axial temperature field uniformity and load characteristic of the zero-temperature thermostat is smaller than that of the ice water mixture. Meanwhile, the uncertainty results also reveal that the zero-temperature thermostat is more stable than the ice water mixture. This study provides a comprehensive method for evaluating the performance of zero temperature thermostats, which can be used to verify the accuracy of the instrument and ensures the reliability of the thermocouple thermometers measurement, and promotes the development of zero temperature thermostat in temperature measurement field.
Dry block furnaces are widely used in on-site measurement and calibration of food, petrochemical, pharmaceutical, semiconductor, and other manufacturing enterprises. The accuracy of dry-block furnace temperature measurement has always been a problem for temperature calibrator. The research on the dry-block furnace mainly focuses on the stability measurement, the on-site temperature calibration method, the temperature distribution uniformity and so on. Therefore, the axial temperature distribution of dry-block furnace is an important factor affecting its accuracy. In this study, the dry-block furnace (Const 660 produced in China) is selected as the research object to study the relationship between calibration temperature and axial temperature distribution of dry well furnace by experimental method. The results found that from the bottom of the furnace to the wellhead side, the temperature probe insertion depth should be as close as possible to the bottom of the well, and the closer the calibration temperature is to the ambient temperature, the higher the accuracy of the temperature measurement. The study provides more comprehensive and reliable experimental data for the application of dry-block furnace in field temperature calibration, so as to improve the accuracy of temperature measurement and better application of dry block furnace.
Dry block furnaces are widely used in on-site measurement and calibration of food, petrochemical, pharmaceutical, semiconductor, and other manufacturing enterprises for their advantages such as pollution-free, simple operation, easy to carry, fast rise and fall, and wide usable temperature range. The accuracy of dry-block furnace temperature measurement is always a problem for calibrator. The stability of dry-block furnace is an important factor affecting its accuracy. In conventional dry block calibrators, the drift of the internal reference thermometer and temperature gradients in the normalization block are the main contributors to the accuracy. However, the experimental comparison of the stability of the different brands dry-block furnace at different calibration temperatures is rare. we carry out validation and evaluation project to evaluate the stability of dry-block furnaces of two brands at home and abroad, the relationship between calibration temperature and stability of dry well furnace is analyzed by experiments. The results show that the overall stability of RTC158 is better than that of Const660. The measurement accuracy of RTC158 is better than that of Const660. We hope that this experiment can provide more comprehensive and reliable experimental data for the application of dry well furnace in field temperature calibration, so as to improve the accuracy of temperature measurement.
The current conventional pressure thermometer temperature measurement error detection method mainly realizes detection by calculating the fixed error of temperature measurement, which leads to poor detection effect due to the lack of analysis of the uncertainty in the temperature measurement process. Therefore, based on Hall sensors, research has been conducted on the detection method of temperature measurement errors in pressure thermometers. Firstly, the uncertainties in different temperature measurement scenarios are analyzed and combined, and the temperature measurement error detection device is constructed. Hall sensors are used to judge the stability of the thermometer temperature values in the thermostat tank, and the actual temperature error is calculated by combining the deviation values brought by the uncertainties. In the experiment, the proposed method is tested for the accuracy of temperature measurement error detection. The experimental results show that the proposed method has a low misjudgment rate and has a more excellent detection effect when the temperature measurement error of the pressure thermometer is detected by the proposed method.
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