Experimental Study on Temperature Gradient of Thermostatic Bath
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摘要: 通过实验研究了侧搅拌式恒温水槽和恒温油槽100 mm以上的温度梯度。研究表明在50~200 ℃范围内恒温槽30~100 mm上层温场温度梯度能够达到工作用玻璃液体温度计、工业铂电阻温度计等常规工业温度计规程规范要求。根据实验结果,置入深度对传感器的测量结果的影响取决于传感器材料的导热系数。导热系数越小,影响越小。对于相同材质的温度传感器,置入深度对传感器的测量结果的影响取决于深度直径比。根据实验结果可以推断,在校准置入深度较短温度传感器时,被校传感器的轴向传热是测量误差的主要来源,随着校准温度的提高,置入深度对测量结果的影响越来越大。Abstract: Temperature gradient of the side stirred constant thermostatic bath above 100 mm has been studied experimentally. The research shows that the temperature gradient of the upper temperature field of the thermostat bath (30~100) mm can meet the requirements of the general industrial thermometers such as liquid-in-glass thermometer for working and industrial platinum resistance thermometer between 50 ℃ and 200 ℃. According the experiment, the influence of insertion depth on the sensor measurement results depends on the thermal conductivity of the sensor material. The smaller the thermal conductivity is, the smaller the influence will be. For temperature sensors of the same material, the influence of the insertion depth on the measured result depends on the depth-to-diameter ratio. It could be inferred from the experiment that when calibrating the shorter temperature sensor, the axial heat transfer is the main source of measurement errors. As the calibration temperature increases, the insertion depth has a greater influence on the measurement results.
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Key words:
- thermostatic bath /
- temperature gradient /
- shorter temperature sensor
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表 1 恒温槽水平温场测试结果
Table 1. Horizontal temperature field test results of thermostatic bath
温度 温场均匀性/℃ 30 mm 70 mm 50 mm 100 mm 50 ℃ 0.006 0.004 0.004 0.003 100 ℃ 0.010 0.006 0.007 0.004 200 ℃ 0.014 0.010 0.009 0.007 -
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