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测定仪有一可伸缩的金属底座1,上面装有活动锌电极2和固定铜电极4。固定铜电极与底座靠绝缘垫5绝缘,活动电极与固定电极的电耦合借助于弹簧来实现。电极偶与被测谷物接触时产生的电信号由小型电测指示器(微安表) PA 记录。电测指示器的刻度盘上的刻度是根据电化学电动势的电流值与谷物含水量的关系计算作出的。电极的工作表面有刻纹,挤压时可使谷物破损,保证了电极之间有可靠的电流耦合。为了预防短
The tester has a retractable metal base 1 with a movable zinc electrode 2 and a fixed copper electrode 4 mounted thereon. The fixed copper electrode is insulated from the base by the insulating pad 5, and the electrical coupling between the movable electrode and the fixed electrode is realized by means of a spring. The electrical signals generated when the electrode couples with the measured grain are recorded by a small electrical test indicator (microammeter) PA. The scale on the dial of the electrical indicator is calculated from the relationship between the current value of the electrochemical emf and the moisture content of the grain. The working surface of the electrode is engraved, the grain can be damaged when pressed, and the reliable current coupling between the electrodes is ensured. In order to prevent short