| 摘要 |
<p>Sampling equipment is provided for sensing and controlling the settling rate of a flocculated slurry suspension in a settling tank, the sampling equipment comprises a metering device (23) including a vertical settling chamber for repeatedly taking a sample of the suspension from the settling tank. Means (33, 35, 19) are provided for temporarily retaining the height of the sample at a preselected level during a settling period and detector means (40, 41, 42) are provided for detecting when a boundary level defined by the settling solids reaches a further preselected level. Timer means determine the actual settling period elapsing between the start of the settling period and the time when the boundary level has reached the further preselected level.</p> |
