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Several precautions in handling ProMinent metering pump applications

When the ProMinent metering pump outlet is at atmospheric pressure, is there any way to increase the repeatability of the pump?
Pay attention to the following when running the dosing system:
A. Adding pressure
B. Stroke frequency
C. Suction height
D. Altitude
E. Corrosiveness of chemicals

When the ProMinent metering pump outlet is at atmospheric pressure, is there any way to increase the repeatability of the pump?
Installing the valve spring on the ProMinent metering pump discharge valve improves repeatability, but the most effective improvement is to install a back pressure valve at the end of the line.
How to adjust the back pressure valve?
1. Never exceed the maximum working pressure of the ProMinent metering pump.
2. When the ProMinent metering pump is under pressure at the suction end, the pressure at the discharge end of the pump is at least 1 bar higher than the pressure at the suction end.
How to choose the appropriate pulse damper volume?
By multiplying the metering capacity (ml) of each stroke of the metering pump by 26, the minimum volume (ml) of the pulsation damper required to reduce the pulsation by 90% can be obtained.
How to set the pressure of the safety valve?
The pressure of the safety valve can be adjusted within the rated working pressure range of the metering pump and must not exceed the maximum working pressure of the metering pump. The safety valve is designed to prevent overpressure operation of the metering pump. For example, if the metering pump has a maximum working pressure of 3 bar, the safety valve pressure should be set to 3 bar, or lower to ensure proper operation of the metering pump. Overpressure work is one of the main causes of damage to the metering pump.
If the liquid delivered is not water, how is the suction rise calculated?
Divide the rated suction lift of the metering pump by the specific gravity of the metering liquid.
Under what circumstances do you use self-priming aspiration?
Self-priming aspiration can be applied in the following situations:

1. The metered liquid is easily volatilized;
2. The specific gravity of the metering liquid is large;
3. When a higher stroke frequency is required;
4. When the metering pump works in high altitude areas;
5. Large tanks are required for on-site applications, and self-priming by metering pumps is not feasible.

Can you give some advice on the choice of pump heads for metering pumps? What problems usually arise when it comes to the corrosion of the pump head/seal by chemicals? How to avoid it?
When it comes to metering pump heads, the usual problem is when measuring acid, chlorine, fluoride and hydrogen peroxide. Due to differences in drug concentration and operating temperature, it is difficult to determine the specific pump head material. When measuring fluoride, we recommend Viton® sealed PVC pump heads. For most chlorination applications, an EPDM sealed NP (Plexiglas) pump head is preferred. For the hydrogen peroxide mixture, only PTFE-sealed PTFE pump heads or stainless steel pump heads can be used. Concentrated hydrochloric acid is usually metered using a Viton® sealed plexiglass pump head. The sulphuric acid can be metered from a PTFE sealed PTFE pump head. The manufacturer of the chemical will give advice or consult the ProMinent® chemical corrosion chart to determine the compatibility of the chemical with the contact material.
What are the factors that must be considered when metering liquids at the pump head?
The main considerations are the viscosity, specific gravity, vapor pressure and temperature of the liquid.

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