When operating a dosing system, there are several important factors to consider in order to ensure safe and efficient performance. These include:
A. **Dosing Pressure**: Maintaining the correct pressure is crucial for consistent and accurate dosing. Too much or too little pressure can affect the pump's performance.
B. **Stroke Frequency**: The frequency at which the pump strokes impacts the flow rate and accuracy of the dosage. Adjustments may be necessary based on application requirements.
C. **Suction Height**: This refers to the vertical distance the pump must lift the liquid from the source. Higher suction heights may require adjustments or specialized pumps.
D. **Altitude**: At higher altitudes, atmospheric pressure decreases, which can affect the pump’s ability to prime and operate efficiently. Special considerations may be needed for high-altitude installations.
E. **Corrosive Chemicals**: If the system handles corrosive substances, it’s essential to use compatible materials and ensure proper maintenance to prevent damage and leaks.
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When the metering pump outlet is at atmospheric pressure, improving the pump’s repeat measurement accuracy is vital for reliable operation. One effective method is to install a backpressure valve at the end of the line. While adding a valve spring to the discharge valve can help, the most significant improvement comes from using a backpressure valve. This ensures consistent flow and minimizes pulsation, leading to more accurate dosing.
**How to adjust the back pressure valve?**
1. Always ensure that the pressure does not exceed the maximum working pressure of the metering pump.
2. If there is pressure on the suction side, the discharge side must be at least 1 bar higher than the suction pressure to maintain proper operation.
**How to choose the right pulse damper volume?**
To determine the appropriate pulse damper size, multiply the metering capacity per stroke (in ml) by 26. This calculation gives the minimum required volume to reduce 90% of the pulsation, ensuring smoother and more stable operation.
**How to set the pressure relief valve?**
The safety valve should be adjusted within the rated working pressure range of the metering pump. It must never exceed the maximum allowable pressure. The purpose of the relief valve is to prevent over-pressurization, which is a common cause of pump failure. For example, if the pump’s maximum working pressure is 3 bar, the relief valve should be set at 3 bar or lower to protect the system.
**What is the maximum allowable forward pressure when using ProMinent® metering pumps?**
For ProMinent® Alpha metering pumps, the forward pressure should not exceed 1 bar above the pump’s discharge pressure. Exceeding this limit can cause the pump to malfunction or fail.
**If the delivered liquid is not water, how to calculate the suction height?**
To account for different liquids, divide the metering pump’s nominal suction height by the specific gravity of the liquid being pumped. This adjustment helps ensure the pump can handle the load effectively.
**Under what circumstances is self-priming suction used?**
Self-priming suction is recommended in the following situations:
1. When measuring volatile liquids.
2. When handling liquids with a high proportion or viscosity.
3. When higher stroke frequencies are required.
4. When the pump operates in high-altitude areas.
5. In applications where a large tank is needed and standard priming methods are not feasible.
By understanding these key points, operators can optimize the performance and longevity of their dosing systems while ensuring accurate and reliable dosing.
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