| 摘要 |
PURPOSE:To control the concentration of laver suspension, automatically, by detecting the concentration with a light-receptor, and driving a water pump or a laver- feed pump according to the level of the concentration relative to the preset value. CONSTITUTION:The transistors Tr1 and Tr2 are in conduct states when the concentration of a laver suspension is lower than the values preset by variable resistors R12 and R12, i.e. the intensity of light received by the light-receptor CdS is higher than a preset value. When the concentration is lower than the value set by the resistor R22, the transistor Tr2 energizes the relay A to drive the laver-feed motor M2. When the concentration exceeds the value corresponding to the resistor R12, the transistor Tr1 is cut off to drive the water pump M1. |
