Metering pump selection points
What information is needed to properly select a metering pump?
1. Determine the type of liquid being measured, including its flow characteristics.
2. Understand the main properties of the liquid, such as chemical compatibility, viscosity, and specific gravity.
3. Consider the system back pressure, which affects the pump's performance.
4. Evaluate the suitable suction height to ensure proper operation.
5. Identify any additional requirements, such as analog or pulse control, flow monitoring, and timer functions.
What are the main advantages of electromagnetic driven metering pumps?
Electromagnetically driven metering pumps have a simple design with only one moving part—the armature shaft. This simplicity leads to higher reliability and lower maintenance. These pumps are particularly well-suited for low-flow and low-pressure applications. They also perform well under fluctuating voltage conditions, making them ideal for environments where power stability is a concern.
And what are the advantages of using fixed frequency with variable stroke length, or fixed stroke length with variable frequency?
By calibrating the pump, you can determine the exact dose per stroke. The total dosage is then calculated by multiplying the dose per stroke by the frequency. When frequency is adjusted, the dosage changes linearly—meaning 50% frequency results in 50% dosage. This allows for precise control, and with external signals like pulse or analog input, the dosage can be adjusted from minimum to maximum within seconds. Compared to motor-driven stroke length adjustment, this method is more cost-effective and easier to implement.
How to use the performance curve of the metering pump?
1. Locate the performance curve that corresponds to your selected metering pump model.
2. Identify the current system back pressure and locate it on the curve.
3. Find the correction factor by drawing a vertical line from the back pressure value to the curve and reading the factor on the left side.
4. Divide the required dosage by the correction factor to get the corrected flow rate in ml/min or L/h.
5. Plot this corrected value on the dosing scale.
6. Use a ruler to find the corresponding stroke length and frequency settings that will achieve the desired dosage.
This process ensures accurate and efficient pump operation, even under varying system conditions.
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