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What information is needed to properly select a metering pump?
To choose the right metering pump, several key factors must be considered. First, you need to know the flow rate of the liquid being measured. This will determine the size and capacity of the pump required. Second, it's important to understand the properties of the liquid, such as its chemical composition, viscosity, and specific gravity. These characteristics can affect pump performance and material compatibility. Third, the system’s back pressure should be evaluated, as this influences the pump’s ability to deliver the correct dosage. Fourth, the suction height or lift capability of the pump must match the application requirements. Lastly, additional features like analog control, pulse control, flow monitoring, or timer functions may be necessary depending on the application.
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—making them highly reliable and easy to maintain. The fewer moving parts there are, the less likely mechanical failure will occur. These pumps are ideal for low-flow and low-pressure environments and perform well even with fluctuations in supply voltage. Additionally, they are energy-efficient and provide precise dosing control.
What are the advantages of fixed frequency with variable stroke length, or fixed stroke length with variable frequency?
Adjusting either the stroke length or the frequency allows for precise control over the dosing rate. When using a fixed frequency, varying the stroke length changes the amount of fluid delivered per cycle. Alternatively, keeping the stroke length constant while adjusting the frequency allows for smooth and continuous dosage adjustment. This method is linear—meaning 50% frequency results in 50% dosing. It also enables quick and accurate adjustments through external signals like pulses or analog inputs. Compared to motor-driven stroke length adjustments, this method is more cost-effective and simpler to implement.
How to use the performance curve of a metering pump?
To use the performance curve effectively: first, locate the performance curve that corresponds to your selected metering pump model. Next, identify the current back pressure in the system. Then, look at the chart and mark the back pressure value. From that point, draw a vertical line up to the curve. At the intersection point, read the correction factor from the scale. Divide the desired dosage by this correction factor to calculate the actual flow rate in mL/min or L/h. Finally, place this calculated value on the dosage scale. Using a ruler, you can then determine the appropriate stroke length and frequency settings for optimal performance.
This approach ensures accurate dosing under varying system conditions and helps maximize the efficiency and reliability of the metering pump.
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