当通风柜排风量降至预设的最低排风量之下时，需产生声光报警。
When the fume exhaust falls below a preset safety level, the alarm will sound and the alarm light will come.
提出了确定主风口侧排风量的计算公式； 为工程设计提供了参考依据。
The calculation formula for determining the exhaust air rate of main air port has been given out as a reference to the project design.
零位高度的偏离可通过设置前馈控制系统、调节进排风量差来进行补偿和调整。
According to the principle of adjusting the volume-difference between supplied and drawn air, the deviation of zero-position can be quickly regulated by setting feed-forward control system.
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