| 摘要 |
An infusion control apparatus senses drops of an infusion liquid by way of a variation in the quantity of light received from a light source after the light passes through a drop chamber. When drops of the liquid are not sensed over a predetermined period of time, a cut-off operation for closing off an infusion liquid flow passage starts and takes priority over other forms of control. When a drop-wise flow of the liquid is sensed during the cut-off operation, the flow passage closing action is interrupted and a transition is made to resume control wherein the liquid drop interval is computed from an input signal based on the variation in received light, and the liquid flow passage is adjusted so that the drop interval is made to approach a set value.
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