The photoelectric cell controls a servomotor. 该光电管控制着一个伺服电动机。
As beans fall into bins, photoelectric cells detect duds, signaling for them to be rejected individually with a puff from an air nozzle. 方式是在豆子落入容器的过程中,利用光电管挑出其中的坏豆子,然后送讯号给空气喷嘴对准一吹,将坏豆子个别剔除。