Comparative Experimental Study on the Stability of Two Brands 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.