提出了一种基于两级闭环控制的新型型砂水分控制系统，阐述了温度补偿系数的设定方法。
A new Measuring and controlling system of moisture ratio in molding sand based on two level closed loop control is presented, and setting method of temperature compensation factor is described.
电路运用带隙温度补偿技术，采用共源共栅电流镜，两级运放输出用于自身偏置电路。
The technology of temperature compensation and cascade current mirror was used, and the output of two stage amplifier was used for the bias of itself.
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