原文：
当运行加药系统时重点注意以下事项： A.投加点压力 B.冲程频率 C.吸升高度 D.海拔高度 E.化学品的腐蚀性 当计量泵出口为大气压时，有什么办法可以提高泵的重复计量精度? 在计量泵排出阀安装阀弹簧可以改善重复计量精度，但是xxx的改善办法是在管线的末端安装一个背压阀。 怎么调节背压阀? 1.永远不要超过计量泵的{zd0}工作压力。 2.当计量泵在吸液端有压力时，泵的排出端的压力至少要比吸入端的压力高1bar。 如何计选择合适的脉冲阻尼器容积？ 用计量泵每一冲程的计量能力（ml）乘以26，就可以得出减小90%脉动所需要的脉冲阻尼器的最小容积(ml)。 如何设定安全阀的压力? 安全阀的压力可以在计量泵额定工作压力范围之内调整，不允许超过计量泵的{zd0}工作压力。安全阀设计用来防止计量泵过压运行。例如，如果计量泵的{zd0}工作压力为3bar，安全阀的压力就应该设定为3bar，或者更低一些以确保计量泵的正常工作。超压工作是导致计量泵损坏的主要原因之一。 如果输送的液体不是水，吸升高度如何计算? 将计量泵的额定吸升高度除以计量液体的比重。 在什么情况下用自灌式吸液? 可以在以下情况下应用自灌式吸液： 1.计量的液体容易挥发； 2.计量液体比重较大； 3.当需要较高的冲程频率时； 4.计量泵在高海拔地区工作时； 5.在现场应用时需要较大的储罐，并且依靠计量泵自吸不可行的情况下。 能否给出一些关于计量泵泵头选择方面的建议?在涉及到化学药品对泵头/密封的腐蚀方面，通常会有哪些问题出现，应如何避免？ 在涉及到计量泵泵头，通常的问题是出现在计量酸、氯、氟化物和过氧化氢的情况时。由于药品浓度和操作温度的不同，很难确定具体泵头材质。在计量氟化物时，我们推荐选用Viton®密封的PVC泵头。对于大多数加氯的应用，{zh0}选用EPDM密封的NP(有机玻璃)泵头。对于过氧化氢混合物的计量只能选用PTFE密封的PTFE泵头或不锈钢泵头。浓盐酸的计量通常选用Viton®密封的有机玻璃泵头。浓硫酸的计量可以选择PTFE密封的PTFE泵头。化学药品的制造商会给出相关的建议，或者查阅ProMinent®化学防腐图表来确定化学药品与接触材质的相容性。 在泵头计量液体时，必须考虑哪些影响因素? 主要考虑的因素有液体的粘度、比重、蒸汽压和温度。

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译文：
When running dosing system to focus on the following: A. Dosing point pressure B. Stroke frequency C. suction lift D. Altitude E. corrosive chemicals When the metering pump to atmospheric pressure, there any way to improve the measurement accuracy of the pump to repeat? Metering pump discharge valve installed in the valve spring can improve the precision of repeated measures, but the most effective way for improvement is in the pipeline at the end of a back pressure valve installed. How adjusting back pressure valve? 1. Never exceed the maximum working pressure metering pump. 2. When the metering pump liquid end of the suction pressure, the pump discharge pressure side suction pressure at least higher than 1bar. How the selection of suitable volume pulse damper? Metering pumps with each stroke of the metering capacity (ml) multiplied by 26, it can be required to reduce 90% of the pulse of the pulse damper minimum volume (ml). How to set the pressure relief valve? Pressure relief valve in the pump working pressure measured within the scope of adjustment must not exceed the maximum working pressure metering pump. Safety valve designed to prevent excessive pressure metering pumps running. For example, if the maximum working pressure metering pumps for the 3bar, the pressure relief valve should be set to 3bar, or lower number to ensure that the metering pump to work properly. Overpressure is the main reason leading to damage to one of metering pumps. If the transmission fluid instead of water, suction lift calculated? The metering pump is rated suction lift divided by the proportion of liquid measurement. Under what circumstances self-filling with liquid suction? Can be applied in the following cases suction fluid from the filling: 1. Measurement of fluid likely to be volatile; 2. Measuring the proportion of large liquid; 3. When you need a higher stroke frequency; 4. Metering pumps work at high altitudes; 5. In the field use need larger tanks and metering pumps self-priming is not feasible to rely on the case. Metering pumps can pump head is given about the selection of the proposal? In relation to the chemicals on the pump head / sealed corrosion aspects, which usually have problems, how to avoid? In relation to the metering pump pump head, the usual problem is that in measuring acid, chlorine, fluoride and hydrogen peroxide in the case. As the drugs in different concentrations and operating temperature, it is difficult to identify specific pump head material. In the measurement of fluoride, we recommend use of PVC Viton ® seal pump head. For most of the chlorination of the application, the best use EPDM seals NP (PMMA) pump head. Mixture for the measurement of hydrogen peroxide can only use PTFE or stainless steel pump head seal PTFE pump head. Measurement of concentrated hydrochloric acid is usually used Viton ® sealed glass pump head. Measurement of sulfuric acid can choose sealed PTFE PTFE pump head. Chemical manufacturers give recommendations related to, or access to ProMinent ® chemical resistance chart to determine the chemical compatibility of materials and contacts. When measuring liquid in the pump head, which influence factors must be considered? The main consideration with liquid viscosity, specific gravity, vapor pressure and temperature