Introduction was given to the principle of auto-control system for constant filtration velocity and constant water level in No.
介绍了东莞第三水厂恒滤速、恒水位过滤自控系统的原理，探讨了水位控制精度低的原因及改进方法。
Consequently, it is often necessary to close a series of basins by means of sluices and thus maintain a constant water level in the closed port section.
因此有必要使用泄水闸来封闭一些港区，以保持封闭港区中的水位。
Both the theoretical and experimental results have shown that there is a constant water level difference between the refined dynamic water level and the static one in the same well.
理论分析和实验表明，改性动水位与同一井孔对应的静水位之间相差一恒定水位落差。
If the phase change, while the amplitude is almost constant, tidal water level response to meet the transition state.
若相位变化，而振幅几乎不变，井水位潮汐响应满足过渡状态。
The study results show as follows: water level drawdown appears before support crushing and water inrush; and the velocity of water level drawdown basically keeps constant.
结果表明：松散承压含水层水位下降超前于工作面压架突水，且水位下降速度基本保持不变。
Constant flow rate manually adjustable, proportional flow rate according to a digital input signal (from water meter), Power-ON led indicator and level control input. The two different modes are.
比例调节，可根据数字信号（比如水表发出的脉冲信号）来调节流量的比例，带有电源指示和液位探头接口，可直接连接液位探头控制计量泵启动或停止。
Constant flow rate manually adjustable, proportional flow rate according to a digital input signal (from water meter), Power-ON led indicator and level control input. The two different modes are.
比例调节，可根据数字信号（比如水表发出的脉冲信号）来调节流量的比例，带有电源指示和液位探头接口，可直接连接液位探头控制计量泵启动或停止。
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