1AF料液体积精确计量系统研究

Study on the Accurate Volume Measurement System of 1AF Solution

在带有吹气液位和密度测量系统的模拟计量槽上进行了若干批体积标定。将原始数据标准化到某参考条件 (主要是温度 )下 ,根据计量槽内横截面积的变化及其反映出的残差分布图和增量斜率图 ,将数据划分成若干个模型段。将同一段内的各批数据进行适当的修正和补偿 ,把体积作为自变量、液位作为因变量 ,采用反向回归模式进行处理 ,根据数据的分布情况求出合适的标定方程 ,然后求标定方程的反方程 ,得出体积测量方程 ,并计算出相应的不确定度。利用测量方程可测定生产中与实测液位相应的料液体积。该系统经过对比验证 ,体积测量的不确定度低于 0 .3% (k=3)。

Several runs of volume calibrations were carried out to the simulative account tank equipped with a set of pneumatic liquid and density measurement apparatus. The raw data from each calibration run are standardized to a certain set of reference condition (the major parameter is temperature). Then, according to the variance of the cross-section area of the tank and the profile plots, incremental slope plots, the tank is divided into several model segments. Giving some appropriate correction and compensation, the data in each segment are fitted into calibration functions with the inverse regression model. In the model, volume increments are independent variables and liquid heights are responses. The calibration functions are reversed into measurement functions and the appropriate uncertainty must be calculated. The measurement functions can be used to determinate the volume of process solution responding to a certain liquid height then. In the contrast testing, the relative uncertainty of the transfer volume is better than 0.3% (k = 3).