原文：
一、计量泵的选型参数： 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。 二、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。 三、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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译文：
1, metering pump selection parameters: 1. By measuring liquid flow. 2. By measuring the main characteristics of the liquid, such as chemical resistance, viscosity and specific weight. 3. The system back pressure. 4. The right of the suction lift. 5. Need other options, such as analog control, pulse volume control, flow monitoring and timer. Second, electromagnetic metering pump drive What are the main advantages? Electromagnetic metering pump drive is only one moving part - the armature. Generally, the more moving parts work as little more reliable metering pumps. Metering pumps are suitable for low flow, low pressure in the workplace, and supply voltage fluctuations have a good compensation effect. With a fixed frequency, changing the length of the metering pump stroke compared to a fixed stroke length, change the frequency of metering pumps What are the advantages? Through the correction, each stroke of the 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 (frequency = 50% 50% dosage). Through an external pulse or analog volume control, the dosage can be in seconds from the minimum to maximum. Other than motor drive stroke length adjustment costs to be much lower. Third, how to use the metering pump performance curve? 1. To find and the selection of the appropriate metering pump performance curve. 2. In the following chart labeled the current back pressure. 3. Determine the correction factor, taken to bar back pressure value for the unit, extended upward to curve to the left at the intersection of the vertical correction factor values read. 4. With the need for adding value divided by the correction values obtained in ml / min. Or L / h as the unit of value. 5. The dosage calculated on the middle scale. 6. When this value is placed on the dosage scale, you can use a ruler to find the stroke length and stroke frequency set to set.