What information is needed to properly select a metering pump? To ensure the right metering pump is chosen for your application, several key factors must be considered. First, you need to know the flow rate of the liquid being measured. Next, it's important to understand the main characteristics of the liquid, such as its chemical compatibility, viscosity, and specific gravity. Additionally, you should account for the system back pressure, which affects the pump’s performance. The suitable suction height is also crucial, as it determines how effectively the pump can draw in the liquid. Finally, consider any additional features you may need, such as analog or pulse control, flow monitoring, or timer functions. These options can enhance precision and automation in your dosing process. What are the main advantages of an electromagnetically driven metering pump? Electromagnetically driven metering pumps offer several benefits. They have only one moving part—the armature shaft—which reduces mechanical complexity and increases reliability. This simplicity makes them ideal for low-flow, low-pressure applications. These pumps also perform well under voltage fluctuations, ensuring consistent operation. Their design allows for precise control and is generally more cost-effective than other types of metering pumps. What are the advantages of fixed frequency with variable stroke length, or fixed stroke length with variable frequency? Adjusting either the stroke length or frequency allows for precise control over the dosing rate. When the stroke length is fixed and frequency is varied, the dosing amount changes proportionally with the frequency. Similarly, if the frequency is fixed and the stroke length is adjusted, the dosage will change accordingly. This flexibility makes it easy to fine-tune the output based on process needs. Calibration ensures that each stroke delivers a known volume, so the total dosage can be calculated accurately (dosing = dose per stroke × frequency). With external control signals like pulse or analog inputs, the dosing can be adjusted rapidly, from minimum to maximum, within seconds. Compared to motor-driven stroke adjustment, this method is simpler and more cost-effective. How to use the performance curve of a metering pump? Using the performance curve helps you adjust the pump’s output to match your requirements. First, locate the performance curve that corresponds to your selected metering pump model. Then, identify the current back pressure in the system and mark it on the chart. Next, find the correction factor by aligning the back pressure value (in bar) with the curve and reading the corresponding value on the left side. Divide the required dosage by this correction factor to determine the actual flow rate in ml/min or L/h. Once you have this value, place it on the dosage scale. Using a ruler, you can then determine the appropriate stroke length and frequency settings to achieve the desired dosing. This process ensures accurate and efficient operation of the metering pump.

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