What information is needed to properly select a metering pump?
To choose the right metering pump, you need to gather several key details. First, determine the flow rate of the liquid being measured. Next, consider the properties of the liquid, such as its chemical composition, viscosity, and specific gravity, as these can affect pump performance. Also, assess the system’s back pressure, which is crucial for ensuring proper operation. The suction height should also be evaluated, as it influences the pump's ability to draw in the liquid. Additionally, think about any extra features you may need, like analog or pulse control, flow monitoring, or timer functions, depending on your application requirements.
What are the main advantages of an electromagnetic-driven metering pump?
Electromagnetically driven metering pumps have a simple design with only one moving part—the armature shaft. This reduces the chances of mechanical failure and increases reliability. These pumps are ideal for low-flow, low-pressure applications and perform well even when there are fluctuations in the power supply. Their simplicity also makes them easier to maintain and more cost-effective compared to other types of pumps.
What are the benefits of adjusting the frequency versus changing the stroke length on a metering pump?
By calibrating the pump, you can know the exact dose delivered per stroke. The total dosage is then calculated by multiplying the dose per stroke by the frequency. This means the dosing is directly proportional to the frequency—so 50% frequency results in 50% dosage. With external pulse or analog control, the dosage can be adjusted instantly from minimum to maximum within seconds. Compared to motor-driven stroke length adjustments, this method is more cost-effective and provides greater flexibility in control.
How to use the performance curve of a metering pump?
First, locate the performance curve that corresponds to the selected metering pump model. Then, identify the current back pressure value on the chart. Look at the back pressure bar and extend a line vertically up to the curve. At the point where the line intersects the curve, read the correction factor. Divide the required dosing amount by this correction factor to get the actual flow rate in mL/min or L/h. Finally, place this calculated value on the dosing scale. Using a ruler, you can then determine the appropriate stroke length and frequency settings for optimal performance.
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