译文：
恰当地选择计量泵都需要哪些信息?
1. 被计量液体的流量。
2. 被计量液体的主要特性，例如化学腐蚀性、黏度和比重等。
3. 系统的背压。
4. 合适的吸升高度。
5. 需要的其他选项，如模拟量控制、脉冲量控制、流量监视和定时器。
电磁驱动计量泵有哪些主要优势?
电磁驱动计量泵只有一个运动部件—电枢轴。通常来讲，运动部件越少则计量泵工作越可靠。计量泵非常适合于低流量、低压力工作场合，并且在供电电压波动时有良好的补偿作用。
与固定频率、改变冲程长度的计量泵相比较， 固定冲程长度、改变频率的计量泵有哪些优势?
通过校正，每一个冲程的投加量是已知的。因此总的投加量可以通过计算得出（投加量=每冲程投加量*频率）。总投加量与频率成线性关系（50 % 频率 = 50 % 投加量） 。通过外部的脉冲或模拟量控制，投加量可以在一秒钟之内从最小调到{zd0}。另外它比电机驱动的冲程长度调节成本要低的多。
如何使用计量泵的性能曲线图?
1. 找到与所选用的计量泵相应的性能曲线图。
2. 在下面的图表中标示出当前的背压。
3. 确定修正因数，取以bar为单位的背压值，向上延伸至曲线，在交叉点垂直向左读取修正因数值。
4. 用需要的投加量值除以修正因数值，得出以 ml/min.或 L/h为单位的值。 5. 把计算结果放在投加量刻度的中间。
6. 当把这个值放在投加量刻度上时，可以使用一把直尺，查找出冲程长度设定和冲程频率设定。

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原文：
Proper selection of metering pumps need what information?
1. Have been measured fluid flow.
2. The main features of the liquid has been measured, such as chemical resistance, viscosity and specific gravity.
3. The system back pressure.
4. The appropriate suction lifting height.
5. What is needed other options, such as the analog volume control, pulse volume control, flow monitoring and timer.
Solenoid-driven metering pump What are the main advantages?
Solenoid-driven metering pump is only one moving part - electric pivot. Generally, the more moving parts work varies from the more reliable metering pumps. Metering pump is very suitable for low-flow, low pressure in the workplace, and in supply voltage fluctuations have a good compensation effect.
With a fixed frequency, changing the stroke length of the metering pump compared to a fixed stroke length, changing the frequency of metering pumps What are the advantages?
Through the correction, a stroke each dosage is known. Therefore, the total dosage can be calculated (dosage = dosage of each stroke * frequency). The total dosage and frequency of a linear relationship (50% frequency = 50% of the dosage). Through an external pulse or analog volume control, dosage can be one seconds from the minimum to maximum. Another motor-driven than the length of the stroke adjustment of costs to be much lower.
How to use the metering pump performance curve?
1. Find a choice of metering pumps with the corresponding performance curve.
2. In the following chart, marked out of the current back pressure.
3. To determine the amendment factor, taken as a unit of the back pressure in order to bar the value of extended upward to curve to the left at the intersection of the vertical read the amendment because it values.
4. With the need to increase the investment value divided by the amendment because it values obtained in order to ml / min. Or L / h as the unit value.
5. The results on the middle of the dosage scale.
6. When this value is placed on the dosage scale, you can use a ruler to find out the stroke length and stroke frequency to set to set.